Multipoint ISL and Ranging for miniaturized equipment
Asteroid Impact Mission Industry Days – ESTEC | February 23 th 2016
Miguel Angel Fernandez – SYRLINKS

February 2016 SYRLINKS - Restricted Slide 2

 Focuses on advanced, compact, & high reliable radios, for harsh environments
 Advanced and cost-effective radio-communication manufacturer
 Designs, develops of communication systems in radio navigation & geolocalization
 Parternship with CNES and ESA since 1997 (Rosetta)
 200 cumulated years in orbit, with 100% reliability
 Pioneer in the use of qualified active COTS
*
RENNES
*
PARIS
 Large space portfolio for LEO missions up to 10 years in orbit, especially based on CLASS 3 ECC-Q-ST-60C design
February 2016 SYRLINKS - Restricted Slide 3

1997: EWC15
S Band “ISL”
2012: G-SPHERE-S
GNSS Receiver
2010: EWC22/24/28
X Band HDR TM
2011: GREAT2 (ESA)
GaN Reliability And Technology
Transfer initiative
2004-2013: EWC15
S Band TT&C
MYRIADE:
CNES/ AIRBUS D&S/ TAS
2010: EWC20
L Band Transmitter
2013: EWC27 & 31
Nano Radios
2014: EWC30 & 29
CLASS 3 ECSS-Q-
ST-6O-C Radios
MYRIADE Evolutions
ADS/CNES/TAS plateform
2004: Rosetta/Philae.
ESA/CNES
2005 : Deep Impact
JPL
Demeter, Essaim (4),
Parasol, Spirale (4), Picard,
Alsat 2a, Alsat 2b*, Elisa,
SSOT, Smese, Taranis*,
Vnredsat, Microscope*,
PROBA-V: 2013
QinetiQ /ESA
2013: SARAL
TAS, ISRO/CLS/
NOAA/CNES
Microscope : 2016
CNES
2015 : GOMX-3
(ESA/Gomspace)
EYESAT: CNES
OPS-SAT TU Graz/ESA
Others: EU + NAFTA
2016 : PerùSAT-1 (ADS)
2020 : MERLIN,
DLR/CNES
Others: EU
@ ESA - ROSETTA
February 2016
@ CNES – MYRIADE 1 @ ESA – Proba-V @ CNES – SARAL
SYRLINKS - Restricted
@ CNES @ESA – GOMX-3
Slide 4

 A joint development between Syrlinks and CNES:
− Subject
− Scope
Multipoint access ISL and Low complexity Ranging
Miniaturized equipment for solar system exploration
− HW baseline Syrlinks EWC31 S-band TT&C Transceiver
− Start date
− End date
March 2016
March 2017 (TRL-5)
 Continuation of ESA GSTP 5.1 study “Low Cost S-band Flexible TTC
Transponder for Minisatellites” which achievements are:
SYRLINKS EWC31
S band TT&C for nano satellites
− Design and implementation of a PCM/PM/SPL modulator
− Development of Coherence and Ranging features
− Transparent Tone Ranging (ESA 100k)
SYRLINKS EWC29
Mini Sat / Class 3 S band TT&C
February 2016 SYRLINKS - Restricted Slide 5

 KEY FEATURES:
− Single Unit , S Band downlink & uplink,
− CCSDS & Fully operating from S-band tracking ground networks (ESA, CNES, …)
− 2 years in LEO: Radiation tested and hardened (TID) , smart protection against SEL
− Tracking capabilities : Ranging and Coherence in options.
− Miniature & Compliant with main 10x10 bus provider : 92x96mm, PC 104.
− Diplexer available to:
 Connect 2 S-band patch Rx/Tx antennas to the transceiver mounted on opposite faces, through a
3 dB coupler.
 Permit always 2 antennas pointing toward the ground, whatever the altitude orbit.
SYRLINKS EWC31
S band TT&C for nano satellites
 To be used on OPS-SAT (ESA, 2017), EYE-SAT (CNES, 2017)
February 2016 SYRLINKS - Restricted Slide 6

 General specifications :
− Development of low complexity algorithms for onboard (orbiter) ranging measurements.
− Simultaneous ranging measurement and data transmission.
− Target ranging accuracy below 10 meters at 2 σ .
− As a goal : Ranging accuracy improvement to <1 meter using advanced processing.
 Main tasks:
− PCM/PM/SP-L modulation implementation on EWC31 Transceiver.
− Matlab implementation and test of the ranging function of the orbiter.
− Analysis of HW/SW calibrations required for minimizing the ranging errors.
− FPGA implementation and demonstration using two EWC31 (1 orbiter + 1 lander).
February 2016 SYRLINKS - Restricted Slide 7

 General specifications:
− Simultaneous communications between an orbiter and up to 7 landers in a star topology
(the orbiter being the master) and optionally in a mesh topology.
− Adaptation of the ranging function for a multipoint configuration.
− Data rate of 512kbps (1Mbps as a goal).
 Main tasks:
− Define the communication strategy: Full-duplex TDMA as a possible baseline.
− Define the algorithms and multiple access protocols, possibly reusing parts of the
CCSDS Proximity Link-1 (PL-1).
− Evaluation of specific ranging in case of more than one link.
− Evaluation of performances and implementation complexity for both TDMA and FDMA.
− Selection of the best multiple access scheme and related protocols and algorithms.
− SW implementation and architecture validation on a 3 nodes network.
February 2016 SYRLINKS - Restricted Slide 8

Parameters AIM requirements
Communication scheme MH: Full duplex
Network topology
MH: Star network
NH: Mesh network
Ranging accuracy MH: < 1 meter
Data rate
Rate control
Clock synchronization
MH: 1Mbps
MH: Variable
NH: Adaptive
Time synchronization /
Time correlation
Current dev.
Simplex and/or duplex
Star network
In option: mesh network
1 meter (TBC)
1Mbps
Variable
TBD
MH: Must Have
NH: Nice to Have
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Status
+
+
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February 2016 SYRLINKS - Restricted Slide 9

28, Rue Robert Keller, ZAC des Champs Blancs
35 510 Cesson-Sevigne - France
Miguel Angel Fernandez | Tel : +33 6 86 56 00 68 miguel.fernandez@syrlinks.com
, www.syrlinks.com
February 2016 SYRLINKS - Restricted Slide 10