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Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Electromagnetic compatibility and Radio spectrum Matters (ERM); Short Range Devices; Part 3: “Technical characteristics and test methods for radar equipment for Railway/Road Crossings obstacle detection system applications operating in the 76 to 77 GHz range” and “Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive”

< 2 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Reference DEN/ERM-TGSRR-65-3

Keywords Radar, Radio,.Testing, Trsting SRD, Short Range

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ETSI 3 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Contents Contents...... 3 Intellectual Property Rights...... 5 Foreword...... 5 1 Scope...... 6 2 References...... 6 2.1 Normative references...... 7 2.2 Informative references...... 7 3 Definitions, symbols and abbreviations...... 8 3.1 Definitions...... 8 3.2 Symbols...... 910 3.3 Abbreviations...... 10 4 Technical requirements specifications...... 1011 4.1 Equipment requirements for testing purposes...... 1011 4.1.1 Choice of model for testing...... 11 4.2 Mechanical and electrical design...... 11 4.3 Auxiliary test equipment...... 11 4.4 Interpretation of the measurement results...... 11 5 Test conditions, power sources and ambient temperatures...... 1112 5.1 Normal and extreme test conditions...... 1112 5.2 External test power source...... 1212 5.3 Normal test conditions...... 12 5.3.1 Normal temperature and humidity...... 12 5.3.2 Normal test power source...... 1213 5.3.2.1 Mains voltage...... 1213 5.3.2.2 Other power sources...... 1213 5.4 Extreme test conditions...... 1213 5.4.1 Extreme temperatures...... 1213 5.4.1.1 Procedure for tests at extreme temperatures...... 1213 5.4.1.2 Extreme temperature ranges...... 1213 5.4.2 Extreme test source voltages...... 1313 5.4.2.1 Mains voltage...... 1313 5.4.2.2 Other power sources...... 13 6 General conditions...... 1314 6.1 Test fixture...... 1314 6.1.1 Calibration...... 1415 6.1.2 General requirements for RF cables and waveguides...... 1415 6.1.3 Shielded anechoic chamber...... 15 7 . Methods of measurement and limits for transmitter parameters...... 20 7.1 Permitted range of operating frequencies...... 21 7.1.1 Definition...... 21 7.1.2 Method of measurement...... 21 7.1.3 Limits...... 21 7.2 Radiated power...... 22 7.2.1.1 Radiated spectral mean power density...... 22 7.2.1.2 Maximum radiated peak power (e.i.r.p.)...... 22 7.2.2 Method of measurement...... 22 7.2.2.1 for maximum radiated spectral mean power density (e.i.r.p.)...... 22 7.2.2.2 for maximum radiated peak power (e.i.r.p.)...... 22 7.2.2.3 Equipment with a fixed beam antenna (i.e. non-steerable by either mechanical or electronic means)...... 23 7.2.2.4 Equipment with (electronically or mechanically) steerable antenna(s)...... 24 7.2.3 Limits...... 24

ETSI 4 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

7.2.3.1 Equipment with fixed beam antenna...... 25 7.2.3.2 Equipment with (electronically or mechanically) steerable antennas...... 25 7.3 Out-of-band emissions...... 25 7.3.1 Definitions...... 26 7.3.2 Measuring receiver...... 26 7.3.3 Method of measurement...... 26 7.3.4 Limits...... 27 7.4 Radiated spurious emissions...... 27 7.4.1 Definition...... 27 7.4.2 Measuring receiver...... 27 7.4.3 Method of measurement for radiated spurious emissions...... 28 7.4.4 Limits...... 28 8 Measurement uncertainty...... 30 Annex A (normative): HS Requirements and conformance Test specifications Table (HS-RTT)..31 Annex B (informative): The EN title in the official languages...... 32 Annex C (normative): Radiated measurements...... 33 C.1 Test sites and general arrangements for measurements involving the use of radiated fields...... 33 C.1.1 Open Area Test Site (OATS)...... 33 C.1.2 Test antenna...... 34 C.1.3 Standard position...... 34 C.1.4 Indoor test site...... 34 C.2 Guidance on the use of radiation test sites...... 35 C.2.1 Measuring distance...... 35 C.2.2 Test antenna...... 35 C.2.3 Substitution antenna...... 36 C.2.4 Auxiliary cables...... 36 C.3 Alternative test site using a fully anechoic RF chamber...... 36 C.3.1 Example of the construction of a shielded anechoic chamber...... 36 C.3.2 Influence of parasitic reflections in anechoic chambers...... 37 C.3.3 Calibration of the shielded RF anechoic chamber...... 37 Annex D (normative): ...... 39 B.1 Radiated measurements...... 39 Annex E (normative), Installation and operational requirements E.1 Installation requirements E.2 operational requirements E.3 Definition of supervision area in the horizontal plane E.4 Definition of the supervision area in the vertical plane E.5 Measurement of emission levels E.6: Emission limits of the installation Annex F (informative): Excample: How to convert of power density to e.i.r.p...... 40 E.1 Assumptions...... 40 E.2 Calculation Example...... 40 Annex G (informative): Bibliography...... 40 History...... 417

ETSI 5 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Intellectual Property Rights

IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "“Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards"”, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http://ipr.etsi.org).

Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document.

Foreword

This draft European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters (ERM), and is now submitted for the combined Public Enquiry and vote phase of the ETSI standards EN Approval Procedure.

For non EU countries the present document may be used for regulatory (Type Approval) purposes.

Where equipment compliant with the present document is intended for fitment into vehicles, then it is subject to automotive EMC type approval under directive 2004/104/EC [i.6]. For use on vehicles outside the scope of 2004/104/EC [Error: Reference source not found another EMC directive/standard appropriate for that use is required.

The present document is part 3 of a multi-part deliverable covering Electromagnetic compatibility and Radio spectrum Matters (ERM); as identified below:

Part 1: Electromagnetic compatibility and Radio spectrum Matters (ERM); Short Range Devices; Transport and Traffic Telematics (TTT); Ground based vehicular radar equipment operating in the 76 GHz to 77 GHz range;

Technical characteristics and test methods for ground based vehicular radar equipment operating in the 76 GHz to 77 GHz range"”

Part 2: Electromagnetic compatibility and Radio spectrum Matters (ERM); Short Range Devices; Transport and Traffic Telematics (TTT); Ground based vehicular radar equipment operating in the 76 GHz to 77 GHz range;

Harmonized EN covering essential requirements of article 3.2 of the R&TTE Directive

Part 3: Electromagnetic compatibility and Radio spectrum Matters (ERM); Short Range Devices;

Part 3 Technical characteristics and test methods for radar equipment for Railway/Road Crossings obstacle detection systems operating in the 76 to 77 GHz range and Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive.

The title and reference to the present document are intended to be included in the publication in the Official Journal of the European Union of titles and references of Harmonized Standard under the Directive 1999/5/EC.

See article 5.1 of Directive 1999/5/EC for information on presumption of conformity and Harmonised Standards or parts thereof the references of which have been published in the Official Journal of the European Union.

The requirements for part 3 relevant to Directive 1999/5/EC are summarized in annex A.

ETSI 6 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Proposed national transposition dates Date of latest announcement of this EN (doa): 3 months after ETSI publication Date of latest publication of new National Standard or endorsement of this EN (dop/e): 6 months after doa Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

e.... 1Scope

The present document specifies the requirements for Short Range Devices (SRD) used for obstacle detection at Railway/Road Crossings such as defined in ERC/REC 70-03 annex 4 [i.5].

The document applies to:

a) transmitters operating in the range from 76 GHz to 77 GHz;

b) receivers operating in the range from 76 GHz to 77 GHz.

The present document contains the technical characteristics and test methods for radar equipment fitted with integral antennas operating in the frequency range from 76 GHz to 77 GHz and references CEPT/ERC/ECC Recommendation for SRDs, CEPT/ERC/ECC Recommendation 70-03 [i.5] and the EC SRD decision 2011/829/EU 2013/752/EU [i.8]

The present document does not necessarily include all the characteristics which may be required by a user, nor does it necessarily represent the optimum performance achievable.

The present document covers integrated transceivers and separate transmit/receive modules in the range from 76 GHz to 77 GHz, see table 1.

There are two classes defined within the present document: Class 1 (e.g. FM, CW or FSK) and Class 2 (pulsed Doppler radar only). The difference between the two class numbers is the permitted average power level.

Table 1: 76 GHz frequency bands

{Radiocommunications} service Ffrequency bands Transmit 76 GHz to 77GHz Receive 76 GHz to 77GHz

The present document is intended to cover the provisions of Directive 1999/5/EC [10] (R&TTE Directive) article 3.2, which states that "“… radio equipment shall be so constructed that it effectively uses the spectrum allocated to terrestrial/space radio communications and orbital resources so as to avoid harmful interference"”.

In addition to the present document, other ENs that specify technical requirements in respect of essential requirements under other parts of article 3 of the R&TTE Directive [10] will apply to equipment within the scope of the present document.

{In addition to the present document, other Ens that specify technical requirements in respect of essential requirements under other parts of article 3 of the R&TTE Directive may apply to equipment within the scope of the present document.

NOTE: A list of such Ens is included on the web site http://www.newapproach.org.

2 References

References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references,only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies.

Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference.

ETSI 7 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. 2.1 Normative references

The following referenced documents are necessary for the application of the present document

[1] ETSI TR 100 028 (all parts): "“Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobile radio equipment characteristics"”.

[2] CISPR 16: "Specifications for radio disturbance and immunity measuring apparatus and methods".

[3] ETSI TR 102 273-2: "“Electromagnetic compatibility and Radio spectrum Matters (ERM); Improvement on Radiated Methods of Measurement (using test site) and evaluation of the corresponding measurement uncertainties; Part 2: Anechoic chamber"”.

[4] CEPT/ERC Recommendation 01-06: "“Procedure for mutual recognition of type testing and type approval for radio equipment"”. 2.2 Informative references

The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area.

[i.1] ETSI EN 301 091, - part 1 (V1.4.1), Electromagnetic compatibility and Radio spectrum Matters (ERM); Short Range Devices; Transport and Traffic Telematics (TTT); Ground based vehicular radar equipment operating in the 76 GHz to 77 GHz range; Part 1: Technical characteristics and test methods for ground based vehicle radar equipment operating in the 76 GHz to 77 GHz range

[i.2] ETSI TR 102 704 V1.2.1Electromagnetic compatibility and Radio spectrum Matters (ERM); System Reference Document; Short Range Devices (SRD); Radar sensors for non-automotive; ground based vehicular applications in the 76 GHz to 77 GHz frequency range

[i.3] CEPT Report 003, HARMONISATION OF FREQUENCY BANDS TO BE DESIGNATED FOR ROAD TRANSPORT INFORMATION SYSTEMS, Lisbon, February 1991

[i.4] CEPT Report 44, Report approved on 8 March 2013 by the ECC, In response to the EC Permanent Mandate on the ”Annual update of the technical annex of the Commission Decision on the technical harmonisation of radio spectrum for use by short range devices”

[i.5] CEPT/ERC Recommendation 70-03: "“Relating to the use of Short Range Devices (SRD)"”, ANNEX 4: RAILWAY APPLICATIONS.

[i.6] COMMISSION DIRECTIVE 2004/104/EC of 14 October 2004 adapting to technical progress ouncil Directive 72/245/EEC relating to the radio interference (electromagnetic compatibility) of vehicles and amending Directive 70/156/EEC on the approximation of the laws of the Member States relating to the type-approval of motor vehicles and their trailers Void

[i.7] CEPT/ERC/Recommendation 74-01, Cardiff 11: "“Unwanted emissions in the spurious domain"”.

[i.8] COMMISSION IMPLEMENTING DECISION, amending Decision 2006/771/EC on harmonisationRadiocommunication of the radio spectrum for use by short-range devices 2013/752/EU 2011/829/EU,

Note: The title should be updated during the ENAP process, EC DEC actual in the publication process in EC.

[i.9] Recommendation ITU-R SM.329-12 (09/2012), Unwanted emissions in the spurious domain, SM Series, Spectrum management

[i.10] DIRECTIVE 1999/5/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 1999 on radio equipment and telecommunications terminal equipment and the mutual recognition of their conformity

ETSI 8 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

[i.11] Recommendation ITU-R SM.1541-5 (08/2013), Unwanted emissions in the out-of-band domain

3 Definitions, symbols and abbreviations 3.1 Definitions

For the purposes of the present document, the terms and definitions given in the R&TTE Directive [10]Error: Reference source not found] and in the following document apply: antenna cycle: one complete sweep of a mechanically or electronically scanned antenna beam along a predefined spatial path antenna scan duty factor: ratio of the area of the beam (measured at its 3 dB point) to the total area scanned by the antenna (as measured at its 3 dB point) assigned frequency band: frequency band within which the device is authorized to operate associated antenna: antenna and all its associated components which are designed as an indispensable part of the equipment average time: time interval on which a mean measurement is integrated blanking period: time period where no intentional emission occurs duty cycle: the ratio of the total on time of the "“message"” to the total off-time in any one hour period dwell time: accumulated amount of transmission time of uninterrupted continuous transmission within a single given frequency channel and within one channel repetition interval

Equipment Under Test (EUT): radar sensor including the integrated antenna together with any external antenna components which affect or influence its performance equivalent isotropically radiated power (e.i.r.p.): total power or power density transmitted, assuming an isotropic radiator

NOTE: e.i.r.p. is conventionally the product of "“power or power density into the antenna"” and "“antenna gain"”. E.i.r.p. is used for both peak or average power and peak or average power density.

Equivalent pulse power duration: duration of an ideal rectangular pulse which has the same content of energy compared with the pulse shape of the EUT with pulsed modulation or time gating far field measurements: measurement distance should be a minimum of 2d2/ , where d = largest dimension of the antenna aperture of the EUT and  is the operating wavelength of the EUT ground based vehicle: includes but is not limited to passenger cars, busses, trucks, rail engines, ships, aircraft while taxiing, details see [i.2] mean power: supplied from the antenna during an interval of time sufficiently long compared with the lowest frequency encountered in the modulation taken under normal operating conditions

NOTE: For pulsed systems the mean power is equal the peak envelope power multiplied by the time gating duty factor. For CW systems without further time gating the mean power is equal the transmission power without modulation.

On-off gating: methods of transmission with fixed or randomly quiescent period that is much larger than the PRF operating frequency (operating centre frequency): nominal frequency at which equipment is operated

NOTE: Equipment may be able to operate at more than one operating frequency.

Operating frequency range: range of operating frequencies over which the equipment can be adjusted through switching or reprogramming or oscillator tuning

ETSI 9 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

NOTE 1: For pulsed or phase shifting systems without further carrier tuning the operating frequency range is fixed on a single carrier line.

NOTE 2: For analogue or discrete frequency modulated systems (FSK, FMCW) the operating frequency range covers the difference between minimum and maximum of all carrier frequencies on which the equipment can be adjusted.

Out-of Band emission: Emission on a frequency or frequencies immediately outside the necessary bandwidth which results from the modulation process, but exclude spurious emission.

Peak envelope power: mean power (round mean square for sinusoidal carrier wave type) supplied from the antenna during one radio frequency cycle at the crest of the modulation envelope taken under normal operating conditions

Power Spectral Density (PSD): ratio of the amount of power to the used radio measurement bandwidth

NOTE: It is expressed in units of dBm/Hz or as a power in unit dBm with respect to the used bandwidth. In case of measurement with a spectrum analyser the measurement bandwidth is equal to the RBW.

Pulse Repetition Frequency (PRF): inverse of the Pulse Repetition Interval, averaged over a time sufficiently long as to cover all PRI variations

Pulse Repetition Interval (PRI): time between the rising edges of the transmitted (pulsed) output power quiescent period: time instant where no emission occurs radiated spurious emissions: Emission on a frequency or frequencies which are outside the necessary bandwidth and the level of which may be reduced without affecting the corresponding transmission of information. Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and frequency conversion products, but exclude out-of-band emissions.

Radar sensor: Device, or system or assembly which monitors the defined supervision area, especially when used for obstacle detectiona radome: external protective cover which is independent of the associated antenna, and which may contribute to the overall performance of the antenna (and hence, the EUT) sensor: In the radar industry, an alternative term for a radar antenna or radar assembly, especially when used for obstacle detection spread spectrum modulation: modulation technique in which the energy of a transmitted signal is spread throughout a relatively large portion of the frequency spectrum steerable antenna: Directional antenna which can sweep its beam along a predefined spatial path. Steering can be realized by mechanical, electronical or combined means. The antenna beamwidth may stay constant or change with the steering angle, dependent on the steering method.

Supervision area: Aerea of the railway/road crossing zone which is supervised by the radar sensor 3.2 Symbols

For the purposes of the present document, the following symbols apply:

 wavelength  1/Prepetition rate of the modulation wave form ac alternating current B bandwidth d largest dimension of the antenna aperture D antenna scan duty factor Dfb distance between ferrite beads dB decibel dBi gain in decibels relative to an isotropic antenna df spectral distance between 2 lines with similar power levels fmax maximum frequency shift between any two frequency steps

ETSI 10 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

fmin minimum frequency shift between any two frequency steps E field strength Eo reference field strength G blank time period P period of time during in which one cycle of the modulation wave form is completed Pa mean power within the BW PL power of an individual spectral line Prad radiated power R distance Ro reference distance  pulse width Tc chip period 3.3 Abbreviations

For the purposes of the present document, the following abbreviations apply:

AC Anti-Collision ACC Automotive Cruise Control ASK Amplitude Shift Keying CW Continuous Wave DSS Direct Sequence Signal e.i.r.p. equivalent isotropically radiated power ECC Electronic Communications Committee EMC ElectroMagnetic Compatibility ERC European Radiocommunication Committee EUT Equipment Under Test FM Frequency Modulation FMCW Frequency Modulated Continuous Wave FMICW Frequency Modulated Interrupted Continuous Wave FSK Frequency Shift Keying IF Intermediate Frequency LC Level Crossing OATS Open Area Test Site PN Pseudo Noise PRF Pulse Repetition Frequency PRI Pulse Repetition Interval R&TTE Radio and Telecommunications Terminal Equipment RBW Resolution Bandwidth RF Radio Frequency RMS Root Mean Square RTTT Road Transport and Traffic Telematics SRD Short Range Device Tx Transmitter VSWR Voltage Standing Wave Ratio

4 Technical requirements specifications 4.1 Equipment requirements for testing purposes

Each equipment submitted for testing, where applicable, shall fulfil the requirements of the present document on all frequencies over which it is intended to operate. EMC type approval testing to Directive 2004/104/EC [i.6] shall be done on system level.

The applicant shall provide at least one or more samples of the equipment, as appropriate, for testing.

Additionally, technical documentation and operating manuals, sufficient to allow testing to be performed, shall be supplied.

ETSI 11 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

The performance of the equipment submitted for testing shall be representative of the performance of the corresponding production model. In order to avoid any ambiguity in that assessment, the present document contains instructions for the presentation of equipment for testing purposes, conditions of testing (see clause 5) and the measurement methods (see clauses 7 and 8).

Stand alone equipment for testing shall be offered by the applicant along with any ancillary equipment needed for testing (see activation signals clause 4.5). The provider shall declare the frequency range(s), the range of operation conditions and power requirements, necessary installations informations, as applicable, in order to establish the appropriate test conditions.

The EUT will comprise the radar sensor, antenna and radome if needed and will be tested as a stand alone assembly. The EUTs test fixtures may be supplied by the provider to facilitate the tests (see clause 6.1).

These clauses are intended to give confidence that the requirements set out in the document have been met without the necessity of performing measurements on all frequencies.

4.1.1 Choice of model for testing

If an equipment has several optional features, considered not to affect the RF parameters then the tests need only to be performed on the equipment configured with that combination of features considered to be the most complex, as proposed by the provider and agreed by the test laboratory. 4.2 Mechanical and electrical design

The equipment submitted by the provider shall be designed, constructed and manufactured in accordance with good engineering practice and with the aim of minimizing harmful interference to other equipment and services.

Transmitters and receivers may be individualseparate or a combination of units. 4.3 Auxiliary test equipment

All necessary additional test equipment and set-up information shall be prepared and provided when the equipment is submitted for testing. 4.4 Interpretation of the measurement results

The interpretation of the results recorded on the appropriate test report for the measurements described in the present document shall be as follows:

 the measured value relating to the corresponding limit shall be used to decide whether an equipment meets the requirements of the present document;

 the measurement uncertainty value for the measurement of each parameter shall be included in the test report;

 the recorded value of the measurement uncertainty shall, for each measurement, be equal to, or lower than, the figures in the table of measurement uncertainty (see clause 9).

4.5 Installation and operation requirements (Moved to Annexes) The following installation requirements apply

- The radar equipment shall be installed at a permanent fixed position near the rail track / road area (see Figure 1).

- The area of coverage / monitoring (protected area / supervision area) should be declared by the manufacturer / installer. Basically it will be the “danger zone” of crossing area between railway and road.

- To protect other applications inside the same frequency band the emission level should be low as possible, decorrelated in time and additional emission level outside an defined area should be applied.

ETSI 12 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Towards an distance of [2m] outside the the monitoring / protection area, see Firgure 1, the radiadet emission level of [0,5 W/m 230 dBm e.i.r.p] should be not excedet. This limit could be declared by the manufacturer / installer, see Figure 1.

ETSI 13 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

ETSI 14 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Figure 1: protection zones in the horizontal plane with the releted emission levelsXX

- The mounting height of the radar sensor shall not exceed a height of min [0.5m] and max [4 meters], see Figure 2. - To protect other applications inside the same frequency band and additional emission level over an defined elevation angle should be applied.

Above an elevation angle of [10deg]over the horizontal plane (height of the sensor), see Firgure F2, the radiadet emission level of [30 dBm e.i.r.p] should be not excedet. This limit could be declared by the manufacturer / installer, see Figure 2.

ETSI 15 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Figure 2: protection zones in an vertical cut with the releted emission levels

The zone power level requirements are valied for each single sensor and not for the complete sonsor / obstacle detection system (overlapping of the sensor transmissions).

Protection area (red rectangle in Figure 1 and Figure 2): area which have to be protected Supervision area (brownwhite rectangle in Figure 1 and Figure 2): coverage area with > 0,5 W/m 2, but < 50 dBm (e.i.r.p)30 dBm (e.i.r.p) < mean power < 50dBm (e.i.r.p)

ETSI 16 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

For the declaration of the emission level following formular (see Figure 3) could be used.

If the informations (antenna gain of the sensor related to the solid angle direction) are not available an emission level measurement compared to Annex C should be enforced.

β Sensor / with an α Pt r Pt0 S(r,α,β) Figure 3: solid angle dependent tr Antenna16adiocommunigain G(α,β) or With

Pt0: Transmitpower into sensor antenna

Pe.i.r.p: transmitted mean power of the sensor, dependet the solid angle [W]

G: antenna gain of the sensor, dependet the solid angle (antenna pattern) r: distance of point from the sensor [m]

In addition

Add as subheading

- The radar sensor shall only be in operation when the crossing road traffic is ordered to be halted. Therefore following operation / activation procedure should be implemented.

ETSI 17 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Figure 34: shows the principle operation procedure of an obstacle/vehicle detection system

ETSI 18 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

5 Test conditions, power sources and ambient temperatures 5.1 Normal and extreme test conditions

Testing shall be carried out under normal test conditions, and also, where stated, under extreme test conditions.

The test conditions and procedures shall be as specified in clauses 5.2 to 5.4. 5.2 External test power source

During tests the power source of the equipment shall be an external test power source, capable of producing normal and extreme test voltages as specified in clauses 5.3.2 and 5.4.2. The internal impedance of the external test power source shall be low enough to be negligible for its effect on the test results.

The test voltage shall be measured at the point of connection of the power cable to the equipment.

During tests the external test power source voltages shall be within a tolerance of ±1 % relative to the voltage at the beginning of each test. The level of this tolerance can be critical for certain measurements. Using a smaller tolerance provides a reduced uncertainty level for these measurements. 5.3 Normal test conditions 5.3.1 Normal temperature and humidity

The normal temperature and humidity conditions for tests shall be any convenient combination of temperature and humidity within the following ranges:

 temperature: +15C to +35C;

 relative humidity: 20 % to 75 %.

When it is impracticable to carry out tests under these conditions, a note to this effect, stating the ambient temperature and relative humidity during the tests, shall be added to the test report.

5.3.2 Normal test power source

The internal impedance of the test power source shall be low enough for its effect on the test results to be negligible. For the purpose of the tests, the voltage of the external test power source shall be measured at the input terminals of the equipment.

5.3.2.1 Mains voltage

The normal test voltage for equipment shall be the nominal mains voltage. For the purpose of the present document, the nominal voltage shall be the declared voltage, or any of the declared voltages, for which the equipment was designed.

The frequency of the test power source corresponding to the ac mains shall be between 49 Hz and 51 Hz.

5.3.2.2 Other power sources

For operation from other power sources the normal test voltage shall be that declared by the provider. Such values shall be stated in the test report.

ETSI 19 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

5.4 Extreme test conditions 5.4.1 Extreme temperatures 5.4.1.1 Procedure for tests at extreme temperatures

Before measurements are made, the equipment shall have reached thermal balance in the test chamber. The equipment shall not be switched off during the temperature stabilizing period.

If the thermal balance is not checked by measurements, a temperature stabilizing period of at least one hour, or such period as may be decided by the accredited test laboratory, shall be allowed. The sequence of measurements shall be chosen, and the humidity content in the test chamber shall be controlled so that excessive condensation does not occur.

5.4.1.2 Extreme temperature ranges

For tests at extreme temperatures, measurements shall be made in accordance with the procedures specified in clause 5.4.1.1, at the upper and lower temperatures of the following limits:

 temperature: -4020°C to +55°C

5.4.2 Extreme test source voltages 5.4.2.1 Mains voltage

The extreme test voltages for equipment to be connected to an ac mains source shall be the nominal mains voltage ±10 %.

5.4.2.2 Other power sources

For equipment using other power sources, or capable of being operated from a variety of power sources, the extreme test voltages shall be that declared by the provider. These shall be recorded in the test report.

6 General conditions

Detailed descriptions of the radiated measurement arrangements are included in annexes A and B. In general, measurements should be carried out under far field conditions; however, relative power measurements in the 76 GHz to 77 GHz frequency band could be carried out in the near field by using the test fixture as described in clause 6.1 and shown in figure 4.

The far field condition for the EUTs is considered to be fulfilled in a radial distance that shall be a minimum of 2d2/ , where d = largest dimension of the antenna aperture of the EUT and  is the operating wavelength of the EUT.

Absolute power measurements shall be made only in the far field. This prohibits the use of the test fixture shown in figure 5 Error: Reference source not found.

Each test site shall meet the appropriate requirements as defined in published guidelines/standards (e.g. for OATS, the requirements are defined in CISPR 16 [2] ).

ETSI 20 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

6.1 Test fixture

The test fixture for radio equipment operating in the 76 GHz to 77 GHz range enables the EUT to be physically supported, together with a wave guide horn antenna (which is used to couple/sample the transmitted energy), in a fixed physical relationship. The test fixture shall be designed for use in an anechoic environment and allows certain measurements to be performed in the near field. Only relative or comparative measurements may be performed, and only those at the frequencies in the 76 GHz to 77 GHz band over which the test fixture shall have been calibrated. A sketch of a test fixture is depicted in Ffigure 45Error: Reference source not found.

The test fixture incorporates at least one 50  RF connector and a device for electromagnetic coupling to the EUT. It incorporates a means for repeatable positioning of the EUT. Its compactness enables the whole assembly to be accommodated within a test chamber, usually a climatic facility. The EUT can only be confidently tested after verification that the test fixture does not affect its performance.

At set-up, the EUT shall be aligned in the test fixture so that the maximum power is detected at the coupled output. Orientation of the horn antenna will take into account the polarization of the EUT.

In addition, the test fixture shall provide a connection to an external power supply.

The test fixture shall be provided by the provider together with a full description, which shall meet the approval of the selected accredited test laboratory.

The performance characteristics of the test fixture shall be measured and shall be approved by the accredited test laboratory. It shall conform to the following basic parameters:

 the gain of the waveguide horn shall not exceed 20 dBi;

 the physical distance between the front face of the EUT and the waveguide horn shall be between 50 cm and 60 cm;

 the physical height between the centre of the EUT and the supporting structure of the test fixture shall be between 50 cm and 60 cm;

NOTE: Information on uncertainty contributions, and verification procedures are detailed in clauses 5 and 6, respectively, of TR 102 273-2 [3].

 circuitry associated with the RF coupling shall contain no active or non-linear devices;

 the Voltage Standing Wave Ratio (VSWR) at the waveguide flange where measurements are made shall not be greater than 1,5: 1 over the frequency range of the measurements;

 the performance of the test fixture when mounted in the anechoic environment on an open test site, or in a temperature chamber, shall be unaffected by the proximity of surrounding objects or people outside the environment. The performance shall be reproducible if the EUT is removed and then replaced;

 the performance of the test fixture shall remain within the defined limits of the calibration report, when the test conditions are varied over the limits described in clauses 5.3 and 5.4.

6.1.1 Calibration

The calibration of the test fixture (Figure 15) establishes the relationship between the detected output from the test fixture, and the transmitted power (as sampled at the position of the antenna) from the EUT in the test fixture. This can be achieved by using a calibrated horn with a gain of equal to or less than 20 dB, fed from an external signal source, in place of the EUT to determine the variations in detected power with temperature and over frequency.

The calibration of the test fixture shall be carried out by either the provider of the EUT or the accredited test laboratory. The results shall be approved by the accredited test laboratory.

The calibration shall be carried out over the operating frequency band, for at least three frequencies, for the declared polarization of the EUT, and over the temperature ranges specified in clause 5.4.1.2.

ETSI 21 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Waveguide Horn

Equipment Under Test 15 cm Pyramid m

c absorber

0 6

o t

m

c Waveguide Interface

0

5 Flange

50 cm to 60 cm

Figure 1 45: Test fixture

6.1.2 General requirements for RF cables and waveguides

All RF cables or waveguide interconnects, including their connectors at both ends, used within the measurement arrangements and set-ups shall adhere to the following characteristics:

 a nominal characteristic impedance of 50 ;

 a VSWR of less than 1,5 at either end;

 a shielding loss in excess of 60 dB.

All RF cables exposed to radiation shall be loaded with ferrite beads spaced at distance Dfb apart from each other along the entire length of the cable. Such cables are referred to as ferrited cables. The distance Dfb shall be smaller than half of the signal wavelength under test.

All RF cables and waveguide interconnects shall be routed suitably in order to reduce impacts on antenna radiation pattern, antenna gain, antenna impedance.

NOTE: Further details are provided in TR 102 273-2 [3].

6.1.3 Shielded anechoic chamber

A recommended test environment to be used as a test site is the shielded anechoic chamber.

A typical anechoic chamber is shown in Figure 2 56. This type of test chamber attempts to simulate free space conditions.

ETSI 22 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Absorber

Shielding

d1 d d2

 Reference points  r r e e b b r r

o d o s 5 s

b EUT b A A Test antenna

h

d4 

Non-conductive supports d6

d3 Absorber

Figure 2 56: Typical anechoic chamber

The chamber contains suitable antenna supports on both ends.

The supports carrying the test antenna and EUT shall be made of a non-permeable material featuring a low value of its relative permittivity.

The anechoic chamber shall be shielded. Internal walls, floor and ceiling shall be covered with radio absorbing material. The shielding and return loss for perpendicular wave incidence vs. frequency in the measurement frequency range shall meet:

 105 dB shielding loss;

 30 dB return loss.

Both absolute and relative measurements can be performed in an anechoic chamber. Where absolute measurements are to be carried out the chamber shall be verified. The shielded anechoic chamber test site shall be calibrated and validated for the frequency range being applicable.

NOTE: Information on uncertainty contributions, and verification procedures are detailed in clauses 5 and 6, respectively, of TR 102 273-2 [3].

Further information on shielded anechoic chambers is given in clause C.3.

8rereswith the main beam approximately rail limit relevantapply to individuallyin accordance withperformed planeThe emission level at a given position may be expressed in terms of Power Flux Density as illustrated in Figure 10. Alternatively an equivalent method may be used.Power Flux Density at a spatial positionhere

S: Power Flux Density at position r, Ptransmittingequivalent isotropic radiatedtransmitterin the direction in the direction 

eted[ ]NRWL: Note that at +50 dBm eirp, the signal is 8 W/m2 at 1 m, 2 W/m2 at 2 m and 0.5 W/m2 at 4 m range.

We have 3 zones in Figure 1, so should we have 3 limits?

Can we reduce it to two limits? Eg, eirp of the radar and PFD outside the 2 m extension.

ETSI 23 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

77 Methods of measurement and limits for transmitter parameters

To meet the requirements for all applications the EUT shall be measured at its maximum peak and mean output power level and maximum antenna gain. Antenna polar diagrams, together with any antenna sweep profiles (for systems with antenna beam steering capability) and details of polarization, shall be presented and agreed with the accredited test laboratory if they are necessary to enable the measurements described in clause 7 to be performed.

The type of modulation used with the EUT shall be stated in the test report.

Alternative test methods to those described within the present document may be used with the agreement of the manufacturer and at the discretion of the accredited test laboratory. Procedures shall comply with CEPT/ERC Recommendation 01-06 [5] and CISPR 16 [2].

There are two classes defined within the present document: class 1 (e.g. FM, CW or FSK) and class 2 (pulsed Doppler radar only). The only difference between the two class numbers is the permitted level of average power emission. The class is to be stated in the test report.

Typically only one of the two power limits

 mean power (e.i.r.p)

or

 peak power (e.i.r.p) is the decisive, more stringent limit (depending on the modulation waveform). Nevertheless always both limits shall be tested under the described test procedures below. 7.1 Permitted range of operating frequencies 7.1.1 Definition

The permitted range of operating frequencies is the frequency range over which the equipment is authorized to operate.

7.1.2 Method of measurement

The minimum and maximum output frequencies at which the permitted radiated emissions (clause 7.4) spurious and out-of-band emission levels as specified in clause 7.3 are exceeded due to intentional emissions from the radio transmitter shall be measured using the method shown in figure 3 7. If the measuring receiver is capable of measuring the signals directly without any down mixing, the fundamental or harmonic mixer can be omitted. If more than one modulation scheme can be generated by the EUT, then the maximum and minimum frequencies generated by each modulation scheme shall be measured and recorded separately.

ETSI 24 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Fundamental or Harmonic Mixer

Input from Test Measuring Fixture Receiver

Local Oscillator Source Data Store

Figure 3 67: Test equipment for measuring the operating frequency range

This measurement shall be performed at normal and at extreme test conditions (see clauses 5.3 and 5.4).

The method of measurement shall be documented in the test report.

7.1.3 Limits

The permitted range of operating frequencies for intentional emissions shall be from 76 GHz to 77 GHz.

7.2 Radiated power measurements (e.i.r.p) 7.2.1 Definition

7.2.1.1 Radiated mean power (e.i.r.p)

The radiated mean power (e.i.r.p) or "E“uivalent isotropic radiated power (e.i.r.p.)" ”of the radio device under test, at a particular frequency is the product of the (mean) power supplied to the antenna including the antenna gain in a given direction relative to an isotropic antenna under the specified conditions of measurement.

The maximum radiated mean power (e.i.r.p) is the mean power radiated in the direction of the maximum level (usually the bore sight of the antenna) under the specified conditions of measurement.

This radiated power is to be measured in the permitted range of operating frequencies (see clause 7.1) and is expressed as the total power over the entire bandwidth of the device.

The value is given in dBm. The measurements shall be carried out at normal and at extreme test conditions (see clauses 5.3 and 5.4).

The method of measurement shall be documented in the test report.

The radiated mean power (e.i.r.p) is defined as the power per unit area normal to the direction of the electromagnetic wave propagation measured in the permitted range of operating frequencies (see clause 7.1) and is expressed as an mean power (e.i.r.p) over the entired bandwidth of the device. The value is given in dBm. This measurement shall be carried out at normal and at extreme test conditions (see clauses 5.3 and 5.4).

The method of measurement shall be documented in the test report.

ETSI 25 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

7.2.1.2 Maximum radiated peak power (e.i.r.p.)

The maximum radiated peak power (e.i.r.p) is measured in the permitted range of operating frequencies and is an value including antenna gain.

The test shall be performed for normal and extreme test conditions as defined in clauses 5.3 and 5.4

7.2.2 Method of measurements

7.2.2.1 for maximum radiated mean power (e.i.r.p)

Using an applicable measurement procedure e.g. as described in Annexes C and D, the radiated mean power (e.i.r.p) shall be measured according to Figure 4 and recorded in the test report. The method of measurement shall be documented in the test report.

The tests shall be made in an anechoic-shielded chamber, as the measured levels often are lower than the ambient environmental noise.

The principal test set-up is shown in Figure 78. 4

Fundamental or Harmonic Mixer

Input from Test Measuring FixtureFixture Receiver

Local Oscillator Source DataData Store Store

cancan be be omitted omitted if if possiblepossible

Figure 4 78: Principal test set-up for mean power measurements of transmitter operating in the 76 GHz to 77 GHz band

The For measurements above 1 GHz, a spectrum analyszer with an average detector is shall be used .

When measuring the emissions above 1 GHz, the spectrum analyser shall be configured as follows, unless otherwise stated:following spectrum analyser settings shall be used:

 Resolution bandwidth (RBW) = 1 MHz.

 Video bandwidth (VBW) > 3 1 MHz.

 Detector mode: r.m.s. with an averaging time of minimum one cycle time per MHz (maximum 100 ms).

Note 1: To the extendt practicable, the radio device under test is measured using a spectrum analyser configured using the setting described above. However, in order to obtain an adequate signal-to-noise ratio in the measurement system, radiated measurements may have to be made using narrower resolution bandwidths where it is practical. In these cases, the revised measurement configuration should be stated in the test report, together with calculations which permit the taken measurements taken to be compared with the appropriate limits. Furtheron and a Also included should be an explanation of why the signal levels involved, necessitated measurement using the resolution bandwidth which was employed in order to be accurately determined by the measurement equipment.to achieve an accurate measurement.

Note 2: RMS average measurements can be accomplished directly using a spectrum analyser which incorporates an RMS detector. Alternatively, a true RMS level can be measured using a spectrum analyser that does not incorporate an RMS detector (see ITU-R Recommendation SM.1754 [i.2] for details).

Average time (per point on spectrum analyser scan): 1 ms or less.

ETSI 26 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

A measurement time (averaging time) of 1 ms per measurement point is not sufficient to measure wideband FMCW signals. The maximum signal time must be taken into account to set the sweep time of the spectrum analyser .

with

Sweeptime: time for any spectrum analyzer sweep tp: Radar signal time, e.g. FMCW ramp time total measurement BW: e.g. occupied BW of the signal RBW: resolution BW of the spectrum analyzer

To ensure conformance the measurement should also be repeated using different analyszer sweep times fulfilling the condition stated above.

Frequency Span: Equal to or less than the number of displayed samples multiplied by the resolution bandwidth. The measurement results shall be determined and recorded over the frequency ranges as shown in Table 9.

In order to obtain the required sensitivity a narrower bandwidth may be necessary, this shall be stated in the test report form.

The measured spectrum curve at the spectrum analyser is recorded over an amplitude range of approximately 35 dB. Measurements of power densities below -40 dBm/MHz (e.i.r.p.) are not required.

7.2.2.2 for maximum radiated peak power (e.i.r.p.)

The maximum radiated peak power (e.i.r.p) is measured using a spectrum analyser with the peak detector in max-hold mode.

The following spectrum analyser settings shall used:

 Detector mode = Peak with max hold.

 Resolution bandwidth (RBW) < 3 MHz

 Min Video bandwidth (VBW) < 3 MHz (VBW should be equal or higher used RBW).

7.2.2.3 Equipment with a fixed beam antenna (i.e. non-steerable by either mechanical or electronic means)

Using an applicable measurement procedure, such as described in Annexes C and D, the power output shall be measured and recorded in the test report. Absolute power measurements should be carried out under far field conditions, however measurements over temperature may be carried out using comparative measurements in the near field by using the test fixture as described in clause 6.1.

The method of measuring the spatial power density may be carried out either by the use of a calibrated power meter or by using a calibrated receiver. For all methods, the substitution technique described in Annex D shall be used to calibrate the measuring equipment.

The polar diagram together with details of the polarization for the transmit beam (if required to enable the measurement to be carried out) shall be submitted by the provider and approved by the accredited test laboratory.

The maximum radiated mean power (e.i.r.p) spectral density and peak power (e.ir.p) shall be recorded.

The EUT shall be measured under far field conditions under normal test conditions (see clause 5.3). The limits for the radiated mean power spectral density (e.i.r.p) and peak power (e.ir.p) are shown in Table 1.

The EUT under extreme test conditions (see clause 5.4) may be measured in the near field by using, for example, the test fixture defined in clause 6.1.

ETSI 27 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

This measurement shall be carried out in an anechoic environment or may also be carried out at an OATS where no physical obstruction shall be within a sector defined as "th“ree times the 3 dB beamwidth of the antenna" d”uring this test.

7.2.2.4 Equipment with (electronically or mechanically) steerable antenna(s)

Using an applicable measurement procedure, such as described in Annexes C and A, the power output shall be measured and recorded in the test report. Absolute power measurements should be carried under far field conditions, however measurements over temperature may be carried out using comparative measurements in the near field by using the test fixture as described in clause 6.1.

The method of measuring the spatial power density may be carried out either by the use of a calibrated power meter or by using a calibrated receiver. For all methods, the substitution technique described in annex B shall be used to calibrate the measuring equipment.

Peak e.i.r.p. is to be measured using a standard gain horn and spectrum analyser set to slow sweep and peak hold mode. This enables the EUT to be fully tested according to clause 7.2.2.1. The peak power (e.ir.p)shall be recorded according to clause 7.2.2.2. The manufacturer shall provide information relating to the scanning.

The e.i.r.p. shall be measured under far field conditions under normal test conditions (see clause 5.3). The limits for the radiated mean power spectral density (e.i.r.p) and peak power (e.ir.p) are shown in Table 1.

The e.i.r.p. under extreme test conditions (see clause 5.4) may be measured in the near field by using, for example, the test fixture defined in clause 6.1.

This measurement shall be carried out in an anechoic environment or may also be carried out at an OATS where no physical obstruction shall be within a sector defined as "th“ree times the 3 dB beamwidth of the antenna" d”uring this test.

7.2.3 Limits

The transmitter maximum radiated mean and peak power (e.i.r.p.) over the entireiered bandwidth under normal and extreme test conditions shall not exceed the values given in Table 1 Error: Reference source not found and 2.

7.2.3.1 Equipment with fixed beam antenna

The transmitted power for equipment with fixed beam antennas shall be less than the limits shown in Table 31, see reference [i.10], [i.5] and [i.8].

Table 3 1: Limits for transmitted power (fixed antenna)

Class 1 Class 2 (systems others than pulsed Doppler radar) (pulsed Doppler radar only) mean power (e.i.r.p.) 50 dBm 23,5 dBm peak power (e.i.r.p) 55 dBm 55 dBm

7.2.3.2 Equipment with (electronically or mechanically) steerable antennas

The transmitted power for equipment with steerable antennas shall be less than the limits shown in Error: Reference source not found, see reference [i.10], [i.511] and [i.14].

.

ETSI 28 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Table 24: Limits for transmitted power (steerable antenna)

Class 1 Class 2 maximum antenna signal t < 100 ms t > 100 ms t < 100 ms t > 100 ms dwell time (see note 1) mean power (e.i.r.p.) (see [55 dBm + 10 log(D)] or 50 dBm [55 dBm + 10 log(D)] or 23,5 dBm note 2) 50 dBm (whichever is the 23,5 dBm (whichever is the smaller) smaller) Peak Power 55 dBm 55 dBm 55 dBm 55 dBm NOTE 1: t is the largest dwell time at any angle. NOTE 2: D is the ratio of the area of the beam (measured at its 3 dB points) to the total area scanned by the antenna. The power is averaged across one antenna cycle. As D is smaller than 1 (i.e. 100 %), the log(D) value is negative and leads to a reduction of the 55 dBm value.

7.3 Out-of-band emissions

According to CEPT/ERC/REC 74-01 [i.7] ,and Recommendations ITU-R SM.329 [i.910], the boundary between the out-of-band (clause 7.3) and spurious domains (see clause 7.4) is ±250 % of the necessary bandwidth (OBW) from the centre frequency of the emission, see Fig. 5.

Figure 98: 5 Out of band emissions scenario

ETSI 29 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

7.3.1 Definitions

Emission on a frequency or frequencies immediately outside the necessary bandwidth which results from the modulation process, but excluding spurious emissions.

Out-of-band emissions are measured as mean power spectral density (e.i.r.p) under normal operating conditions.

The measurement results of fH and fL will be used to determine the occupied BW of the device.

The Occupied Bandwidth (fH - –L) will be used to calculated the ranges of OOB and spurious domain.

7.3.2 Measuring receiver

The term "me“asuring receiver" r”efers to an spectrum analyser. The bandwidth of the measuring receiver shall, where possible, be according to CISPR 16 [2]. In order to obtain the required sensitivity a narrower bandwidth may be necessary, this shall be stated in the test report form.

The following spectrum analyser settings shall be used:

 Resolution bandwidth (RBW) : see Table 3

 Video bandwidth (VBW)  3 MHz.

 Detector mode: r.m.s. with an averaging time of minimum one cycle time per MHz (maximum 100 ms).

The measured spectrum curve at the spectrum analyser is recorded over an amplitude range of approximately 35 dB. Measurements of spectral mean power densities below -40 dBm/MHz (e.i.r.p.) are not required.

The bandwidth of the measuring receiver shall be less than the maximum given in Table 53, see [i.13].

Table 53: Maximum measuring receiver bandwidths

Frequency being measured Maximum measuring receiver bandwidth f < 1 000 MHz 100 kHz to 120 kHz f  1 000 MHz 1 MHz

7.3.3 Method of measurement

A test site such as one selected from Annex C, which fulfils the requirements of the specified frequency range of this measurement shall be used. The test method employed should be as described in Annex D. The banITU-Rdwidth of the measuring receiver shall be set to a suitable value to correctly measure the unwanted emission. This bandwidth shall be recorded in the test report. For frequencies above 40 GHz a downconverter shall be used as shown in Figure 14910. The local oscillator used to downconvert the received signals shall be stable and with a phase noise of better than -80 dBc/Hz at 100 kHz offset. The local oscillator frequency shall be selected such that the downconverted signal is within the accepted band of the spectrum analyser, and maintaining an adequate IF bandwidth to capture the full spectrum of the signal. The out of band emissions of the EUT shall be measured and recorded, see fig. 6..

ETSI 30 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Fundamental or Harmonic Mixer

Input from Test Measuring FixtureFixture Receiver

Local Oscillator Source DataData Store Store

cancan be be omitted omitted if if possiblepossible

Figure 910: 6 Principal Test setup for measuring out of band radiation above 40 GHz

The out of band emissions of the signal with normal modulation shall be measured and recorded in frequency bands adjacent to the 76 GHz to 77 GHz band, up to the frequencies where the emission level is 50 dB below its maximum value.

7.3.4 Limits

The boarders for the OOB and spurious domain are dependent on the Occupied Bandwidth of the EUT.

The boarders are calculated as follows:

F1 = centre frequency of OBW [GHz] – (2,5* (fH – fL))

F2 = centre frequency of OBW [GHz] + (2,5* (fH – fL))

This calculation takes into account that the border between OOB and spurious will be larger or smaller than the maximum permitted range of operation (see Figure 7).

Figure 7, overview OOB / spurious, dependent from OWB

ETSI 31 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

If the calculated F1/F2 will be below or above the frequency which came out of the calculation based on 250% of the maximum allowed OBW (see table 1 and 2); then the border between OOB / spurious will be fixed at the frequencies in table 6 (normally taken from the 250% rule based on the centre frequency of the signal).

Table 6 : Limits for the max. F1 and F2 frequency, based on the max. theoretical OBW of the EUT

Frequency Bands Centre frequency Max OBW F1 F2 76 GHz to 77 GHz 676.5 GHz 1 GHz 74 GHz 79 GHz

The rms power density radiated in the calculated OOB domain (between F1 - fL and fH – F2 band shall not exceed the values shown in Table 6, [i.4].

Table 7: Limits for out of band radiation

Frequency [GHz] rms power density [dBm/MHz]

F1 - fL 0

fH – F2 0

The out of band emission radiated outside the 76 GHz to 77 GHz band shall not exceed the values shown in Table 4, see[i.9].

Table 4a: Limits for out of band radiation (for systems with 1GHz entrie BW)

Frequency rms power density (dBm/MHz)

73,574 GHz to 76 GHz 0

77 GHz to 79,5 GHz 0

Table 4b: Limits for out of band radiation (releating the entrie BW of the DUT)

Frequency rms power density (dBm/MHz)

(76.5 – (2.5* GHz to 76 GHz 0

77 GHz to 79,5 GHz 0

7.4 Radiated spurious emissions 7.4.1 Definition

Emission on a frequency or frequencies which are outside the necessary bandwidth and the level of which may be reduced without affecting the corresponding transmission of information. Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and frequency conversion products, but exclude out-of-band emissions.

Spurious emissions are measured as spectral power density under normal operating conditions.

According to CEPT/ERC/REC 74-01 [i.7], and Recommendation ITU-R SM.329 [i.10], the boundary between the out- of-band and spurious domains is ±250 % of the necessary bandwidth (OBW) from the centre frequency of the emission.

For the considered frequency band 76 GHz to 77 GHz, the spurious frequency domains are

Frequencies < F1 GHz and frequencies > F2 GHz.

ETSI 32 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

The calculations of these Frequencies is shown in clause 7.3.4, the minimum and maximum values are listed in table 4.

.

7.4.2 Measuring receiver

The following spectrum analyser settings shall be used:

For measurement below 1GHz: detector type: quasi peak

For measuremtn above 1GHz: mean detector

 Resolution bandwidth: 1 MHz.

 Video bandwidth: 3 MHz.

 Detector mode: r.m.s. with an averaging time of minimum one cycle time per MHz (maximum 100 ms).

The measured spectrum curve at the spectrum analyser is recorded over an amplitude range of approximately 35 dB. Measurements of power densities below -40 dBm/MHz (e.i.r.p.) are not required.

7.4.3 Method of measurement for radiated spurious emissions

A test site such as one selected from Annex C, which fulfils the requirements of the specified frequency range of this measurement shall be used. The test method employed should be as described in clause 6

A spectrum analyzer is used as a measuring receiver. The bandwidth of the measuring receiver shall be set to a suitable value to correctly measure the spurious or out-of-band emissions. This bandwidth shall be recorded in the test report. For frequencies above 40 GHz a downconverter may be used. The local oscillator used to downconvert the received signals shall be stable and with a phase noise of better than -80 dBc/Hz at 100 kHz offset. The local oscillator frequency shall be selected such that the downconverted signal is within the accepted band of the spectrum analyzer, and maintaining an adequate Intermediate Frequency (IF) bandwidth to capture the full spectrum of the signal.

The spurious emissions of the EUT shall be measured and recorded. For these measurements it is strongly recommended to use a LNA (low noise amplifier) before the spectrum analyzer input to achieve the required sensitivity, see fig. 8.

Fundamental or Harmonic Mixer

Input from Test Measuring FixtureFixture Receiver

Local Oscillator Source DataData Store Store

cancan be be omitted omitted if if possiblepossible

Figure 1011 8: Principal test setup for measuring spurious emissions above 40 GHz

ETSI 33 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

7.4.4 Limits

The effective radiated power of any radiated spurious emission shall not exceed the values given in Table 85.

Table 8 5: Limits of radiated spurious emissions

Frequency range (MHz) Limit values for spurious radiation Detector type (Measuring receiver bandwidths see table 2) 47 to 74 -54 dBm e.r.p. Quasi-Peak 87,5 to 118 -54 dBm e.r.p. Quasi-Peak 174 to 230 -54 dBm e.r.p.. Quasi-Peak 470 to 862 -54 dBm e.r.p.. Quasi-Peak otherwise in band 30 to 1 000 -36 dBm e.r.p.. Quasi-Peak f > 1 000 to 50 000 -30 dBm e.i.r.p. mean (see note) NOTE: Parameter for measurement: - RBW: 1 MHz - VBW: 3 MHz - Detector: RMS - Sweep time: minimum 1 radar cycle, maximum 100 ms

According to CEPT/ERC/REC 74-01 [i.7], spurious emission is measured up to the 2nd harmonic of the fundamental frequency (in this case, the upper frequency limit up to which measurements are performed is 50 GHz).

The following reference bandwidths shall be used:

 100 kHz between 30 MHz and 1 GHz;

 1 MHz above 1 GHz.

ETSI 34 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

8 Receiver

8.1 Receiver radiated spurious emissions

8.1.1 Definition

Spurious radiations from the receiver are components at any frequency radiated by the equipment and its antenna. They are specified as the radiated power of any discrete signal.

8.1.2 Method of measurement - r–adiated spurious emissions

This method of measurement applies to receivers having an integral antenna:

a) A test site selected from Annex C which fulfils the requirements of the specified frequency range of this measurement shall be used. The test antenna shall be oriented initially for vertical polarization and connected to a measuring receiver. The bandwidth of the measuring receiver shall be adjusted until the sensitivity of the measuring receiver is at least 6 dB below the spurious emission limit given in clause 7.4.4. This bandwidth shall be recorded in the test report.

The receiver under test shall be placed on the support in its standard position.

b) The frequency of the measuring receiver shall be adjusted over the frequency range from 25 MHz up to 100 GHz. The frequency of each spurious component shall be noted. If the test site is disturbed by radiation coming from outside the site, this qualitative search may be performed in a screened room with reduced distance between the transmitter and the test antenna.

c) At each frequency at which a component has been detected, the measuring receiver shall be tuned and the test antenna shall be raised or lowered through the specified height range until the maximum signal level is detected on the measuring receiver.

d) The receiver shall be rotated up to 360 about a vertical axis, to maximize the received signal.

e) The test antenna shall be raised or lowered again through the specified height range until a maximum is obtained. This level shall be noted.

f) The substitution antenna (see clause A.2.3) shall replace the receiver antenna in the same position and in vertical polarization. It shall be connected to the signal generator.

g) At each frequency at which a component has been detected, the signal generator, substitution antenna and measuring receiver shall be tuned. The test antenna shall be raised or lowered through the specified height range until the maximum signal level is detected on the measuring receiver. The level of the signal generator giving the same signal level on the measuring receiver as in step e) shall be noted. This level, after correction due to the gain of the substitution antenna and the cable loss, is the radiated spurious component at this frequency.

h) The frequency and level of each spurious emission measured and the bandwidth of the measuring receiver shall be recorded in the test report.

i) Measurements b) to h) shall be repeated with the test antenna oriented in horizontal polarization.

8.1.3 Limit

The maximum equivalent isotropically radiated power (max. e.I.r.p.) of any spurious emission outside the permitted range of frequencies shall not exceed 2 nW (-57 dBm) in the frequency range 25 MHz ≤f≤1 GHz and shall not exceed 20 nW (-47 dBm) on frequencies in the range 1 GHz < f ≤ 73,5 GHz and 79,5 GHz < f ≤100 GHz in accordance to CEPT/ERC/Recommendation 74-01 [7].

Note: Receiver section deleted because of homodyne principle – nobody can measure the receiver without a TX function and with TX on, Receiver parameters cannot be measured….

Delete this note after TGSRR approval

ETSI 35 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

89 Measurement uncertainty

The accumulated measurement uncertainties of the test system in use, for the parameters to be measured, should not exceed those given in table 6 to ensure that the measurements remain within an acceptable standard.

Table 6: Absolute measurement uncertainty

Parameter Uncertainty Radio Frequency (out of band) ±1  10-7 Radiated Emission (valid to 100 GHz) ±6 dB Temperature ±1 K Humidity ±10 %

The interpretation of the results recorded in the test report for the measurements described in the present document shall be as follows:

 the measured value related to the corresponding limit shall be used to decide whether an equipment meets the requirements of the present document:

a) the value of the measurement uncertainty for the measurement of each parameter shall be separately included in the test report;

b) the value of the measurement uncertainty shall be, for each measurement, equal to or lower than the figures in table 6.

For the test methods, according to the present document the uncertainty figures shall be calculated according to the methods described in the TR 100 028 [1Error: Reference source not found] and shall correspond to an expansion factor (coverage factor) k = 1,96 or k = 2 (which provide confidence levels of respectively 95 % and 95,45 % in case where the distributions characterizing the actual measurement uncertainties are normal (i.e. Gaussian)).

Table 6 is based on such expansion factors.

The particular expansion factor used for the evaluation of the measurement uncertainty shall be stated.

ETSI 36 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Annex A (normative): HS Requirements and conformance Test specifications Table (HS-RTT)

The HS Requirements and conformance Test specifications Table (HS-RTT) in Table A.1 serves a number of purposes, as follows:

 it provides a statement of all the requirements in words and by cross reference to (a) specific clause(s) in the present document or to (a) specific clause(s) in (a) specific referenced document(s);

 it provides a statement of all the test procedures corresponding to those requirements by cross reference to (a) specific clause(s) in the present document or to (a) specific clause(s) in (a) specific referenced document(s);

 it qualifies each requirement to be either:

- Unconditional: meaning that the requirement applies in all circumstances; or

- Conditional: meaning that the requirement is dependent on the manufacturer having chosen to support optional functionality defined within the schedule.

 in the case of Conditional requirements, it associates the requirement with the particular optional service or functionality;

 it qualifies each test procedure to be either:

- Essential: meaning that it is included with the Essential Radio Test Suite and therefore the requirement shall be demonstrated to be met in accordance with the referenced procedures;

- Other: meaning that the test procedure is illustrative but other means of demonstrating compliance with the requirement are permitted.

Table A.1: HS Requirements and conformance Test specifications Table (HS-RTT)

Harmonized Standard EN 301 091-3 Technical Requirement reference Technical Requirement Test Specification Conditionality Reference No. Description U/C Condition E/O Reference Clause No Clause No 1 Permitted range of 7.1.3 U E 7.1.2 operating frequencies 2 Radiated mean power 7.2.3 U E 7.2.2.1 power measurements 3 Radiated peak power 7.2.3 U E 7.2.2.2 4 Out-of-band emissions 7.3.4 U E 7.3.3 5 Spurious emissions 7.4.4 U E 7.4.3 6 Installation and 4.5 C operational requirements

Key to columns:

Requirement:

No A unique identifier for one row of the table which may be used to identify a requirement or its test specification.

Description A textual reference to the requirement.

Clause Number Identification of clause(s) defining the requirement in the present document unless another document is referenced explicitly.

ETSI 37 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Requirement Conditionality:

U/C Indicates whether the requirement is to be unconditionally applicable (U) or is conditional upon the manufacturers claimed functionality of the equipment (C).

Condition Explains the conditions when the requirement shall or shall not be applicable for a technical requirement which is classified "co“nditional".

”Test Specification:

E/O Indicates whether the test specification forms part of the Essential Radio Test Suite (E) or whether it is one of the Other Test Suite (O).

NOTE: All tests whether "E"“ o”r "O"“ a”re relevant to the requirements. Rows designated "E"“ c”ollectively make up the Essential Radio Test Suite; those designated "O"“ m”ake up the Other Test Suite; for those designated "X"“ t”here is no test specified corresponding to the requirement. The completion of all tests classified "E"“ a”s specified with satisfactory outcomes is a necessary condition for a presumption of conformity. Compliance with requirements associated with tests classified "O"“ o”r "X"“ i”s a necessary condition for presumption of conformity, although conformance with the requirement may be claimed by an equivalent test or by manufacturer’s assertion supported by appropriate entries in the technical construction file.

Clause Number Identification of clause(s) defining the test specification in the present document unless another document is referenced explicitly. Where no test is specified (that is, where the previous field is "X"“) ”this field remains blank.

ETSI 38 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Annex B (informative): The EN title in the official languages

Language EN title Czech Danish Dutch English Estonian Finnish French German Greek Hungarian Icelandic Italian Latvian Lithuanian Maltese Polish Portuguese Slovak Slovenian Spanish Swedish

ETSI 39 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Annex C (normative): Radiated measurements C.1 Test sites and general arrangements for measurements involving the use of radiated fields C.1.1 Open Area Test Site (OATS)

The OATS shall be on a reasonably level surface or ground. At one point on the site, an elliptical ground plane conforming to CISPR 16 [2] shall be provided. At one of the foci of this ground plane, a non-conducting support shall be located, capable of rotation in the horizontal and vertical planes, which is used to support the EUT in its standard position, between 0,75 m and 1,5 m above the ground plane. The test antenna shall be sited at the other focus. For measurements below 40 GHz, the test site shall be large enough to allow the erection of a measuring or transmitting antenna at a distance of  /2 or 3 m whichever is greater. For measurements above 40 GHz an anechoic environment should be used, which should be large enough to allow the erection of a test antenna in the far field (i.e. at a distance of not less than 2d2/ ). The distance actually used shall be recorded with the results of the tests carried out on the site. The suitability of a test site shall be verified by the procedure recommended in CISPR 16 [2] and its amendments where applicable.

Sufficient precautions shall be taken to ensure that reflections from extraneous objects adjacent to the site do not degrade the measurements results.

1m to 4m

0.,75 tom 1to. 51m,5m

xX

NOTE 1: Equipment under test. NOTE 2: Test antenna. NOTE 3: High pass filter (may not be necessary). NOTE 4: Spectrum analyser or measuring receiver.

Figure C.1: Measuring arrangement

ETSI 40 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

C.1.2 Test antenna

The test antenna is used to detect the radiation from the EUT, when the site is used for radiation measurements.

This antenna shall be mounted on a support such as to allow the antenna to be used in either horizontal or vertical polarization and for the height of its centre above ground to be varied over the range 1 m to 4 m. A test antenna with pronounced directivity should be used. The size of the test antenna along the measurement axis shall not exceed 20 % of the measuring distance.

For radiation measurements, the test antenna shall be connected to a measuring receiver, capable of being tuned to any frequency under investigation and of measuring accurately the relative levels of signals at its input.

When measuring in the frequency range up to 1 GHz the test antenna shall be a /2 dipole, resonant at the operating frequency, or a shortened dipole, calibrated to the /2 dipole. When measuring in the frequency range above 4 GHz a horn radiator shall be used. For measurements between 1 GHz and 4 GHz either a /2 dipole or a horn radiator may be used.

NOTE: The gain of a horn antenna is generally expressed relative to an isotropic radiator.

For far field measurements, distance "X"“ s”hould be a minimum of 2d2/ , where d = largest dimension of the antenna aperture of the EUT.

Calibrated test antennae shall be used in all measurements.

The distance between the lower extremity of the test antenna and the ground shall not be less than 0,3 m. C.1.3 Standard position

The standard position in all test sites, shall be as follows:

 for equipment with integral antenna, it shall be placed in the position closest to normal use as declared by the manufacturer;

 the polarization of the test antenna and the equipment antenna shall be identical within the bandwidth of the equipment antenna; for all other frequencies the test antenna shall be vertically oriented. C.1.4 Indoor test site

When the frequency of the signals being measured is greater than 80 MHz, use may be made of an indoor site. If this alternative site is used, this shall be recorded in the test report.

Care should be taken as it may not be appropriate to conduct far field measurements above 40 GHz on such a test site.

The measurement site shall be a laboratory room with a minimum area of 6 m by 7 m and at least 2,7 m in height.

Apart from the measuring apparatus and the operator, the room shall be as free as possible from reflecting objects other than the walls, floor and ceiling.

The potential reflections from the wall behind the EUT shall be reduced by placing a barrier of absorbent material in front of it. The corner reflector around the test antenna shall be used to reduce the effect of reflections from the opposite wall and from the floor and ceiling in the case of horizontally polarized measurements.

Similarly, the corner reflector reduces the effects of reflections from the side walls for vertically polarized measurements. For the lower part of the frequency range (below approximately 175 MHz) no corner reflector or absorbent barrier is needed. For practical reasons, the /2 antenna in figure A.2 may be replaced by an antenna of constant length, provided that this length is between /4 and  at the frequency of measurement and the sensitivity of the measuring system is sufficient. In the same way the distance of /2 to the apex may be varied.

The test antenna and measuring receiver, are used in a way similar to that of the general method.

ETSI 41 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

C e i l i n g

 1 , 3 5 m A b s o r b i n g m a t e r i a l

R e f e r e n c e p o i n t C o r n e r r e f l e c t o r o f t e s t s a m p l e W a l l  / 2 T e s t a n t e n n a F e e d e r t o t e s t 4 5 º r e c e i v e r  / 2 3 m t o 4 m 0 , 7 5 m

 0 , 6 m  1 , 3 5 m

F l o o r

Figure C.2: Indoor site arrangement (shown for horizontal polarization)

C.2 Guidance on the use of radiation test sites

For general guidance on the use of radiation test sites refer to CISPR 16 [2].

For measurements involving the use of radiated fields, use may be made of a test site in conformity with the requirements of clause A.1. For measurements above 40 GHz care shall be taken to ensure that the selected test site is appropriate. When using such a test site, the following conditions should be observed to ensure consistency of measuring results. C.2.1 Measuring distance

Evidence indicates that the measuring distance is not critical and does not significantly affect the measuring results, provided that the distance is not less than /2 at the frequency of measurement and the precautions described in this annex are observed. Measuring distances of 3 m, 5 m, 10 m and 30 m are in common use in European test laboratories. C.2.2 Test antenna

Different types of test antenna may be used, since performing substitution measurements reduces the effect of the errors on the measuring results.

Height variation of the test antenna over a range of 1 m to 4 m is essential in order to find the point at which the radiation is a maximum.

Height variation of the test antenna may not be necessary at the lower frequencies below about 100 MHz.

ETSI 42 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

C.2.3 Substitution antenna

The substitution antenna and signal generator is used to replace the EUT in substitution measurements. For measurements below 1 GHz the substitution antenna shall be half wavelength dipole resonant at the frequency under consideration, or a shortened dipole, calibrated to the half wavelength dipole. For measurements between 1 GHz and 4 GHz either a half wavelength dipole or a horn radiator may be used. For measurements above 4 GHz a horn radiator shall be used. The centre of this antenna shall coincide with the reference point of the EUT it has replaced. This reference point shall be the volume centre of the sample when its antenna is mounted inside the cabinet, or the point where an outside antenna is connected to the cabinet. The distance between the lower extremity of the dipole and the ground shall be at least 300 mm. C.2.4 Auxiliary cables

The position of auxiliary cables (power supply, etc.) which are not adequately decoupled may cause variations in the measuring results. In order to get reproducible results, cables and wires of auxiliaries should be arranged vertically downwards (through a hole in the non conducting support).

C.3 Alternative test site using a fully anechoic RF chamber

For radiation measurements when the frequency of the signals being measured is greater than 30 MHz, use may be made of an indoor site being a well-shielded anechoic chamber simulating free space environment. If such a chamber is used, this shall be recorded in the test report.

The test antenna and measuring receiver, are used in a way similar to that of the general method, clause A.1. In the range between 30 MHz and 100 MHz some additional calibration may be necessary.

An example of a typical measurement site may be an electrically shielded anechoic chamber being 10 m long, 5 m broad and 5 m high. Walls and ceiling should be coated with RF absorbers of 1 m height. The base should be covered with absorbing material 1 m thick, and a wooden floor, able to carry test equipment and operators. A measuring distance of 3 m to 5 m in the long middle axis of the chamber can be used for measurements up to 12,75 GHz. For frequencies above 12,75 GHz the chamber may be used provided it has been calibrated for use at the frequency being measured. The construction of the anechoic chamber is described in the following clauses. C.3.1 Example of the construction of a shielded anechoic chamber

Free-field measurements can be simulated in a shielded measuring chamber where the walls are coated with RF absorbers. Figure A.3 shows the requirements for shielding loss and wall return loss of such a room. As dimensions and characteristics of usual absorber materials are critical below 100 MHz (height of absorbers < 1 m, reflection and attenuation < 20 dB) such a room is preferably suitable for measurements above 100 MHz. Figure A.4 shows the construction of a shielded measuring chamber having a base area of 5 m by 10 m and a height of 5 m.

Ceilings and walls are coated with pyramidal formed RF absorbers approximately 1 m high or equivalent material with the same performance. The base is covered with absorbers which form a non-conducting sub-floor, or with special ground floor absorbers. The available internal dimensions of the room are 3 m × 8 m × 3 m, so that a measuring distance of maximum 5 m length in the middle axis of this room is available.

At 100 MHz the measuring distance can be extended up to a maximum of 2 .

The floor absorbers reduce floor reflections so that the antenna height need not be changed and floor reflection influences need not be considered.

All measuring results can therefore be checked with simple calculations and the measurement uncertainties have the smallest possible values due to the simple measuring configuration.

ETSI 43 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

C.3.2 Influence of parasitic reflections in anechoic chambers

For free-space propagation in the far field condition the correlation E = Eo. (Ro/R) is valid for the dependence of the field strength E on the distance R, whereby Eo is the reference field strength in the reference distance Ro.

It is useful to use just this correlation for comparison measurements, as all constants are eliminated with the ratio and neither cable attenuation nor antenna mismatch or antenna dimensions are of importance.

Deviations from the ideal curve can be seen easily if the logarithm of the above equation is used, because the ideal correlation of field strength and distance can then be shown as a straight line and the deviations occurring in practice are clearly visible. This indirect method shows the disturbances due to reflections more readily and is far less problematical than the direct measurement of reflection attenuation.

With an anechoic chamber of the dimensions suggested in clause A.3 at low frequencies up to 100 MHz there are no far field conditions, and therefore reflections are stronger so that careful calibration is necessary. In the medium frequency range from 100 MHz to 1 GHz the dependence of the field strength on the distance meets the expectations very well. In the frequency range of 1 GHz to 100 GHz, because more rejections will occur, the dependence of the field strength on the distance will not correlate so closely. C.3.3 Calibration of the shielded RF anechoic chamber

Calibration of the chamber shall be performed over the range 30 MHz to 100 GHz.

a (dB)

110 100 90 80

70 Minimum limit for the shielding loss 60 50 40 30 20 10 Limit of the return loss 0

10 k 100 k 1 M 10 M 30 M 100 M 300 M 1 G 3 G 10 G 40 G 100 G f (Hz)

Figure C.3: Specification for shielding and reflections

ETSI 44 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Absorbers

10 m

Equipment Measurement distance Measuring under test Non-conductive turntables Antenna 5 m Non-conductive surface

1 m Ground plan

Measurement distance 5 m Absorbers Non-conductive turntables

Shielded room without Filter blocks and absorbers for the coaxial feedthrough test instruments

Figure C.4: Example of construction of an anechoic shielded chamber

ETSI 45 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Annex D (normative):

BD.1 Radiated measurements

Radiated measurements shall be performed with the aid of a test antenna and measuring receiver as described in annex A. The test antenna and measurement receiver, spectrum analyser or selective voltmeter (including all cables) shall be calibrated according to the procedure defined in this annex. The EUT and the test antenna shall be oriented to obtain the maximum emitted power level. This position shall be recorded in the measurement report. The frequency range shall be measured in this position.

For equipment with multiple fixed beam antennas, the tests shall be carried out with the test antenna oriented to obtain the maximum emitted power level, and repeated for each beam position. If the equipment transmits more than one beam at a time, then the maximum e.i.r.p. shall be recorded.

If the equipment has an antenna which is either mechanically or electronically scanned, then the scanning shall be inhibited for these tests. With the scanning stopped, the e.i.r.p. for the EUT shall be measured with the antenna in its position of highest gain (i.e. highest output power) as stated by the provider.

Measurements of absolute power levels below 40 GHz shall be carried out at a distance of  /2 or 3 m, whichever is greater. For measurements of absolute power above 40 GHz an anechoic environment or test site is necessary which should be large enough to allow the erection of a test antenna in the far field (i.e. at a distance of not less than 2d2/ ).

Radiated measurements should be performed either with the EUT in the approved test fixture in an anechoic environment, or using the OATS as described in annex A.

The following conditions shall be fulfilled if an OATS is used for measurements:

a) an OATS which fulfils the requirements of the specified frequency range of this measurement (CISPR 16 [2]) shall be used;

b) the EUT shall be placed on the support in its standard position (see clause A.1.3) and switched on;

c) the test antenna shall be oriented initially for vertical polarization unless otherwise stated. The test antenna shall be raised or lowered, through the specified height range until the maximum signal level is detected on the measuring receiver;

d) the EUT shall be capable of rotation through 360 about a vertical axis to maximize the received signal;

e) the test antenna shall be raised or lowered again, if necessary, through the specified height range until a maximum is obtained. This level shall be recorded.

NOTE: this maximum may be a lower value than the value obtainable at heights outside the specified limits.

f) this measurement shall be repeated for horizontal polarization;

g) the substitution (calibrated) antenna shall replace the EUT, in the same position and in vertical polarization. The frequency of the signal generator shall be adjusted to the Tx (carrier) frequency;

h) steps c) to f) shall be repeated as necessary;

i) the input signal to the substitution (calibrated) antenna shall be adjusted in level via a calibrated attenuator/signal generator until an equal or a known related level to that detected from the Tx is obtained in the test receiver;

j) this measurement shall be repeated with horizontal polarization;

k) the radiated power is equal to the power supplied by the signal generator, increased by the gain of the substitution antenna and the cable losses between the signal generator and the substitution antenna.

ETSI 46 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

If an anechoic chamber is used as opposed to an OATS, the following change to this procedure applies:

- the test antenna shall be oriented initially for vertical polarization unless otherwise stated.

ETSI 47 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Annex E (normative) Installation and operational requirements

E.1 Installation requirements

 The radar sensor shall be installed at a permanent fixed position near the rail track / road area (see Figure e.8).

 The installation height shall be minimum 0.5 metre and maximum 5 metres.

 The radar sensor shall be orientated with the main beam to the supervision area

 The supervision area shall be declared by the manufacturer / installer. This will present the “danger zone” of the crossing area between railway and road.

E.2 Operational requirements

The operation and activation flow chart according to E.2.1 shall be implemented.

ETSI 48 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Figure E.2.1: Flow chart – Obstacle/Vehicle detection for the supervision area at level crossings

ETSI 49 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

E.3 Definition of supervision area in the horizontal plane

Figure E.3.1: Supervision area in the horizontal plane with the relevant emission levels

NOTE I agree with Nick to replace the text in the drawing: please change “ The signals to halt the road traffic may be visual, acoustic or physical barriers”.

E.4 Definition of the supervision area in the vertical plane

 The power level limits of E.4.1 apply to each sensor of the installation individually.

 The supervision area and the installation positions in the vertical plane of the sensors in the vertical plane

ETSI 50 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Shall be defined by the manufacturer / installer

 If the information (antenna gain of the sensor related to the angle in space direction) is not available an emission level measurement in accordance with Annex C should be performed.

Figure E.4.1: Protection zone in a vertical plane with the related emission levels

E.5 Measurement of emission levels

The emission level at a given position may be expressed in terms of Power Flux Density as illustrated in Figure E.5.1 10. Alternatively an equivalent method may be used..

If the informations (antenna gain of the sensor related to the direction of the space (solid) angle) is not available, an emission level measurement compared to Annex C shall be enforced.

β Pt0 S(r,α,β) Peirp

r α

ETSI 51 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Transmitter / with an Antenna

of gain G(α,β)

Figure E.5.1: Power Flux Density at a spatial position

or

Where

S: Power Flux Density at position r, 

Pt0: Power into transmitting antenna

Pe.i.r.p: equivalent isotropic radiated power of thetransmitter, in the direction 

G: antenna gain of the sensor, in the direction 

r: distance of point from the sensor [m]

In addition

E.6: Emission limits of the installation

 Within the protected area (supervision area according to Figure E.4.1 and E.5.1, the maximum emission level shall not exceed < 0,5 W/m 2, or < 50 dBm (e.i.r.p)

 Outside the supervision area the mean power shall not exceed 30 dBm e.i.r.p.

 Beyond a distance of 2 m outside the supervision area, the radiated emission level of [0,5 W/m 2] should be not exceeded.

NRWL: Note that at +50 dBm eirp, the signal is 8 W/m2 at 1 m, 2 W/m2 at 2 m and 0.5 W/m2 at 4 m range.

We have 3 zones in Figure 1, so should we have 3 limits?

ETSI 52 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Can we reduce it to two limits? Eg, eirp of the radar and PFD outside the 2 m extension.

Note TGSRR#17: explanation necessary  e.g. manufacturer can declare (know patteren) or real measurement at an railway crossing

Annex FE (informative): Example: How to convert power flux density (PFD) to e.i.r.p.

This annex offers an example of the conversion from "po“wer/unit area" (”power flux density) to e.i.r.p. FE.1 NotesAssumptions

 e.i.r.p. is the product of "power into the antenna" m”ultiplied by the "an“tenna gain".

 ”e.i.r.p. is the total power transmitted, assuming an isotropic radiation.

 Area of a sphere = d2

 e.i.r.p is dependant on direction, except for an isotropic radiator.

 e.i.r.p is a scalar, while PFD is a vector quantity with a direction in the direction of propagation

 along a given line of propagation, the e.i.r.p of a radiator is a constant but the PFD depends on distance FE.2 Calculation Example

As an example for calculation , the conversion of the relevant FCCa PFD limit into an e.i.r.p. value is shown

For a power flux density of 200 nW/cm2 (measured at 3 m):

200 nW/cm² (at 3 m) = power measured in a 1 cm2 area at 3 m distance.

e.i.r.p. = equivalent total radiated power over the whole area of a sphere.

e.i.r.p. = [power measured in a 1 cm2 area at 3 m distance (W)]  [area of sphere at 3 m (in cm2)].

e.i.r.p. = [(200 × 10-9)  (×36 × 104)] W.

e.i.r.p. = 226,19 mW.

Hence:= 200 nW/cm2 (at 3 m)  23,54 dBm.

ETSI 53 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

Annex GF (informative): Bibliography

 ETSI EN 301 489-1: Electromagnetic compatibility, and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC), standard for radio equipment and services; Part 1: Common technical requirements

 ETSI EN 301 489-3 (V1.2.1): "El“ectromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 3: Specific conditions for Short-Range Devices (SRD) operating on frequencies between 9 kHz and 40 GHz".

 ”ECC Report 056, COMPATIBILITY OF AUTOMOTIVE COLLISION WARNING SHORT RANGE RADAR OPERATING AT 79 GHZ WITH RADIOCOMMUNICATION SERVICES, Stockholm, October 2004

 ITU-R Rec M.1452, 2012-06-06, Millimetre wave vehicular collision avoidance radars and radiocommunication s53adiocommunicationystems for intelligent transport system applications

 CEPT Report 36 Report from CEPT to the European Commission in response to Part 1 of the Mandate on ”Automotive short Range Radar systems (SRR)” Final Report on 25 June 2010 by the ITU-R Rec M.1890, 04/2011, Intelligent transport systems – Guidelines and objectives.

 ITU-R Rep SM.2057, 2005, Studies related to the impact of devices using ultra-wideband technology on radiocommunication s53adiocommunicationervices

 Directive 2004/104/EC of 14 October 2004, adapting to technical progress Council Directive 72/245/EEC, relating to the radio interference (electromagnetic compatibility) of vehicles and amending Directive 70/156/EC on the approximation of the laws of the Member States relating to the type-approval of motor vehicles and their trailers (OJL 337, 13.11.204).

ETSI 54 Draft EN 301 091-3 V1.1.1_0.0.12018 (20143-5)

History

Document history V1.1.1 June 2013 Draft for approval by TGSRR # 15 V1.1.1 June 2013 Draft after TGSRR #15 review with notes for further editing and TGSRR RC

V1.1.1_003 July 2013 Draft after TGSRR # 15 V1.1.1_0.0.4 July 2013 Draft for TGSRR#16

V1.1.1_0.0.5 July 2013 Revision / including some inputs for TG SRR#16 V1.1.1_0.0.6 1st August 2013 Working draft, transfer to a new template + editorial inpts

V1.1.1_0.0.7 2nd August 2013 Working draft, changes based on work on EN 301019-1 and new FIGURE 1 and 2 V1.1.1_0.0.8 1st Sept 2013 Working Draft for TGSRR review

V1.1.1_0.0.9 Sept. 3rd 2013 Working Draft after GoTo meeting Sept. 3rd for further editing V1.1.1_0.0.10 October 2013 Working draft after expert reviews for further comments and approval by TGSRR #17 V1.1.1:0.0.11 October 2013 Outcome TG SRR#17

V1.1.1:0.0.12 May 2014 Amended after ERM 53 Guidance request for OOB/spurious

ETSI

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