X-band transmission evolution towards DVB-S2 for Small Satellites Miguel Angel Fernandez, Anis Latiri, Gabrielle Michaud – SYRLINKS Clément Dudal, Jean-Luc Issler – CNES SSC 2016 – LOGAN | August 10, 2016 Outline About Syrlinks Flight proven X-band transmitter DVB-S2 implementation High Data Rate Transmitter evolutions SYRLINKS – CNES Small Satellite Conference 2016 2 About Syrlinks Flight Proven X-band Transmitter DVB-S2 Implementation High Data Rate Transmitter Evolutions SYRLINKS – CNES Small Satellite Conference 2016 3 About Syrlinks… . Advanced and cost-effective radio-communication manufacturer . Focuses on advanced, compact, & high reliable radios, for harsh environments . Designs, develops of communication systems in radio navigation & geolocation . Partnership with CNES and ESA since 1997 (Rosetta) * * PARIS . 200 cumulated years in orbit, with 100% reliability RENNES . Pioneer in the use of qualified active COTS . Large space portfolio for LEO missions up to 10 years in orbit, especially based on CLASS 3 ECC-Q-ST-60C design SYRLINKS – CNES Small Satellite Conference 2016 4 2014: EWC30 & 29 CLASS 3 ECSS-Q- Some Milestones… ST-60-C Radios 2012: G-SPHERE-S 2013: EWC27 & 31 GNSS Receiver Nano Radios 2010: EWC22/24/28 2010: EWC20 X Band HDR TM L Band Transmitter 2011: GREAT2 (ESA) GaN Reliability And Technology Transfer initiative 1997: EWC15 2004-2013: EWC15 S Band “ISL” S Band TT&C MYRIADE: CNES/ AIRBUS D&S/ TAS MYRIADE Evolutions ADS/CNES/TAS platform 2004: Rosetta/Philae. Demeter, Essaim (4), PROBA-V: 2013 2013: SARAL Microscope: 2016 2015: GOMX-3 2016: PerùSAT-1 (ADS) ESA/CNES Parasol, Spirale (4), Picard, QinetiQ /ESA TAS, ISRO/CLS/ CNES (ESA/Gomspace) 2020: MERLIN, 2005 : Deep Impact Alsat 2a, Alsat 2b*, Elisa, NOAA/CNES EYESAT: CNES DLR/CNES JPL SSOT, Smese, Taranis*, OPS-SAT TU Graz/ESA Others: EU Vnredsat, Microscope*, Others: EU + NAFTA @ ESA - ROSETTA @ CNES – MYRIADE 1 @ ESA – Proba-V @ CNES – SARAL @ CNES @ESA – GOMX-3 SYRLINKS – CNES Small Satellite Conference 2016 5 About Syrlinks Flight Proven X-band Transmitter DVB-S2 Implementation High Data Rate Transmitter Evolutions SYRLINKS – CNES Small Satellite Conference 2016 6 GOMX-3 Mission . Collaboration between ESA and Gomspace (Denmark) . Mission aims: − Demonstrate aircraft ADS-B signal reception − Characterize GEO Telecom satellite spot beam signal quality . Major dates: − Launched on the HTV-5 cargo flight to the ISS on August,19 2015 − Deployed on October 5, 2015 − Continues to operate without loss of functionality . Satellite profile: − 3U Cubesat − Downlink telemetry subsystem from Syrlinks . EWC27 X-band Transmitter . X-band batch antenna SYRLINKS – CNES Small Satellite Conference 2016 7 EWC27 Transmitter Specifications Transmitter characteristics 3 to 50. Inflight configurable Useful data rate (Mbps) Up to 100, in option. Fixed data rate Frequency range (MHz) 8025 - 8450, 1MHz step configurable Harmonic rejection (dB) >50 Convolutive data coding Coding rate 1/2, constraint length 7 Modulation Filtered OQPSK RF output power (dBm) Flexible 30 -33, with 1dB step Advanced features High-efficiency power amplifier Interfaces LVDS data and clock signals I²C, RS422 control bus 50 Ohms antenna interface (SMP) Directives & Standards CCSDS recommendations compliant Power Supply Input voltage (V) +6 to +18 DC Power consumption 10W for 2W RF output power Environmental Operating temperature (°C) -35/+45 Radiation tolerance (kRad) 5 Operating Life Time in Orbit (years) 2 Mechanical Features Dimensions 90x96x26 mm Mass 0.225 kg SYRLINKS – CNES Small Satellite Conference 2016 8 Syrlinks X-band Patch Antenna . Main specifications: − 8,025-8,4 GHz range, Return Loss <-15dB − Compact patch array (7mm Thickness) − Mass: 68g − Integrated Ground Plan − 3W Power Handling Axial Ratio versus frequency Gain versus frequency Normalized Radiated patterns SYRLINKS – CNES Small Satellite Conference 2016 9 Validation Results . Two X-band ground stations from CNES. Telemetry download tests conducted in February 2016. Overall satisfactory results: − SNR better than expected − Very few received bad frames − Configured in low data rate (3Mbps) − 115Mo received data in less than 6min . Correct operation and validation of both: − EWC27 X-band Transmitter − X-band patch antenna SYRLINKS – CNES Small Satellite Conference 2016 10 About Syrlinks Flight Proven X-band Transmitter DVB-S2 Implementation High Data Rate Transmitter Evolutions SYRLINKS – CNES Small Satellite Conference 2016 11 DVB-S2 Telemetry Standard . Main interests: − High end performances − Compatibility with mass market − Optimized downlink capacity through VCM or ACM modes − Growth potential with DVB-S2x new features . Key benefits: − 60% increase of download data rate compared to CCM − Link budget improvement of about 2dB in QPSK − Better spectral efficiency . Reference documents: − ETSI EN 302 307 V1.2.1: Digital Video Broadcasting (DVB); Second Generation Framing Structure, Channel Coding and Modulation Systems for Broadcasting − CCSDS 131.3 B-1: CCSDS Space Link Protocols over ETSI DVB-S2 Standard SYRLINKS – CNES Small Satellite Conference 2016 12 DVB-S2 Transmission . Main characteristics: − Frame oriented transmission − Input data rate dependent on modulation scheme and the coding rate − CCSDS adaptation: Single input continuous Generic Stream SYRLINKS – CNES Small Satellite Conference 2016 13 DVB-S2 Implementation . The DVB-S2 transmitter is composed of the following blocks: baseband encapsulation, channel coding (BCH and LDPC coding), mapping, physical layer encapsulation, filtering. SYRLINKS – CNES Small Satellite Conference 2016 14 X-band DVB-S2 Link Budget Example . Estimate the achievable capacity of . Two use cases (5.5m diameter) X-band DVB-S2 transmitter − Worst case: border of antenna coverage Transmitter and antenna characteristics − Best case: good antenna pointing DVB-S2 coding and modulation QPSK 1/2 and 9/10 RF output power 30 dBm Filter roll-off 0.5 Antenna coverage +/-65° Antenna gain @65° 0 dBi (@0°: 7 dBi) Antenna axial ratio @65° 1.5 dB Total losses 3 dB Satellite altitude 700 km Ground station characteristics 5.5 m (Europe) Diameter 13 m (Polar) 30 dB/K G/T 34 dB/K Total losses 2 dB Overall C/I ratio 20 dB System margin 2 dB SYRLINKS – CNES Small Satellite Conference 2016 15 About Syrlinks Flight Proven X-band Transmitter DVB-S2 Implementation High Data Rate Transmitter Evolutions SYRLINKS – CNES Small Satellite Conference 2016 16 High Data Rate Transmitter Evolutions . Evolutions of EWC27 X-band transmitter for nanosatellites: − Higher data rates require either higher spectral efficiencies or larger bandwidths. 1. Higher order DVB-S2 modulation and coding schemes in X-band − Up to x4 data rate increase with higher MODCOD. − Higher data rate using the same bandwidth. 2. High data rate transmitter in Ka-band − More available bandwidth (x4), allows for higher data rates. − Higher data rates with limited waveform complexity. SYRLINKS – CNES Small Satellite Conference 2016 17 1 – Higher DVB-S2 MODCOD in X-band . Higher spectral efficiency: − Modulation and coding schemes under selection. EWC27 adaptation: − Analog and RF stages are already compatible. − Only FPGA SW development required. SYRLINKS – CNES Small Satellite Conference 2016 18 2 – High Data Rate Ka-band Transmitter . Several years of experience in Ka-band radio design: − Ka/K-band TT&C transceiver − High data rate transmitter in Ka-band − K-band high performance synthesizer . EWC27 adaptation: − Adaptation of the microwave Front-End. − Target data rate for Nanosatellites: 200-300Mbps (first step). SYRLINKS – CNES Small Satellite Conference 2016 19 Questions ? Thank you for your attention! Syrlinks Contact Information: 28, Rue Robert Keller, ZAC des Champs Blancs 35 510 Cesson-Sevigne - France Miguel Angel Fernandez | Tel : +33 6 86 56 00 68 [email protected] , www.syrlinks.com SYRLINKS – CNES Small Satellite Conference 2016 20.