Draft ETSI EN 301 926 V1.1.1 (2001-09) European Standard (Telecommunications series) Satellites Earth Stations and Systems (SES); Radio Frequency and Modulation Standard for Telemetry, Command and Ranging (TCR) of Geostationary Communications Satellites 2 Draft ETSI EN 301 926 V1.1.1 (2001-09) Reference DEN/SES-000-ECSS-1 Keywords control, modulation, satellite, telemetry ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). 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ETSI 3 Draft ETSI EN 301 926 V1.1.1 (2001-09) Contents Intellectual Property Rights................................................................................................................................5 Foreword.............................................................................................................................................................5 1 Scope ........................................................................................................................................................6 2 References ................................................................................................................................................6 3 Definitions and abbreviations...................................................................................................................6 3.1 Definitions..........................................................................................................................................................6 3.2 Abbreviations .....................................................................................................................................................8 4 Applicability.............................................................................................................................................9 5 Modulation Requirements ......................................................................................................................10 5.1 General .............................................................................................................................................................10 5.2 Standard modulation.........................................................................................................................................11 5.2.1 Modulating waveforms...............................................................................................................................11 5.2.2 PCM waveforms and symbol rates .............................................................................................................11 5.2.3 Use of subcarriers .......................................................................................................................................11 5.2.4 Choice of Subcarrier Frequencies...............................................................................................................11 5.2.5 Uplink carrier deviation (Frequency Modulation) ......................................................................................12 5.2.6 Downlink PM modulation index.................................................................................................................12 5.2.7 PM sense of modulation .............................................................................................................................13 5.3 Spread Spectrum Modulation...........................................................................................................................13 5.3.1 Chip shaping ...............................................................................................................................................15 5.4 Coherency properties........................................................................................................................................15 5.4.1 FEC Channel Coding..................................................................................................................................15 6 Requirements on transmitted signals......................................................................................................15 6.1 Frequency stability requirements .....................................................................................................................15 6.1.1 Uplink .........................................................................................................................................................15 6.1.2 Downlink ....................................................................................................................................................16 6.2 Turnaround frequency ratio..............................................................................................................................16 6.3 Polarization.......................................................................................................................................................16 6.4 Phase noise .......................................................................................................................................................16 7 Link Acquisition requirements...............................................................................................................16 Annex A (informative): Operational configuration.....................................................................................17 A.1 Configuration 1: on board dual mode receiver and on board dual mode transmitter.............................18 A.2 Configuration 2: on board dual mode receiver and Standard transmitter...............................................19 A.3 Configuration 3: on board dual mode receiver, Standard transmitter and dedicated RG SS transmitter...............................................................................................................................................20 Annex B (informative): Hybrid Ranging process description....................................................................22 B.1 Presentation ............................................................................................................................................22 B.2 Distance ambiguity resolution................................................................................................................23 B.3 Calibration..............................................................................................................................................24 Annex C (informative): Modulator imperfections.......................................................................................25 C.1 Phase imbalance .....................................................................................................................................25 C.2 BPSK phase imbalance ..........................................................................................................................25 C.3 QPSK phase imbalance ..........................................................................................................................25 ETSI 4 Draft ETSI EN 301 926 V1.1.1 (2001-09) C.4 Amplitude imbalance .............................................................................................................................25 C.5 Data asymmetry......................................................................................................................................26 C.6 Data bit jitter...........................................................................................................................................26 C.7 PN code asymmetry................................................................................................................................26 C.8 PN code chip jitter..................................................................................................................................26 C.9 Chip Transition Time .............................................................................................................................26 C.10 I/Q Data Bit Skew ..................................................................................................................................27 C.11 I/Q PN Code Chip Skew ........................................................................................................................27 Annex D (informative): SRRC