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MASCOT, ROSETTA,… Examples of CNES activity in Proximity Links

MASCOT, ROSETTA,… Examples of CNES activity in Proximity Links. MASCOT (DLR ) is one of the 2 landers of HAYABUSA-2 (JAXA). Rx / Tx 1. RF Load. Rx / Tx 2. RF Load. MASCOT antennas mission. CNES provide RF expertise and UHF antennas to DLR who is

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MASCOT, ROSETTA,… Examples of CNES activity in Proximity Links

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  1. MASCOT, ROSETTA,…Examples of CNES activity in Proximity Links

  2. MASCOT (DLR ) is one of the 2 landers of HAYABUSA-2 (JAXA) Rx/Tx 1 RF Load Rx/Tx 2 RF Load MASCOT antennas mission CNES provide RF expertise and UHF antennas to DLR who is responsible of the UHF Prox Link MASCOT-HB2 • Communication architecture baseline : • JAXA RF-module will be integrated inside MASCOT (at the sides of the MASCOT E-Box) • Redundant transceiver with two antennas (one on the top and on the bottom) to ensure RF-link between Mascot and HY-2 durind Surface Operation Phase • MASCOT-dedicated antenna on MESS for RF-link during cruise HY-2 OME-A HY-2 OME-E HY-2 Mascot Antenna 2 (redundancy) RF-link used during mission MESS-Antenna RF-link used during cruise MASCOT CNES Antenna team development Mascot Antenna 1

  3. MASCOT antennas accommodation and main specifications • Strong accommodation and mass constraints • Patch antenna solution preferred • Antennas are adapted on the frequency band [954.3 – 954.7] MHz • Spherical coverage with one antenna on each side • Strong temperature range to take into account • Polarization is circular (LHCP or RHCP TBC) Available areas for MASCOT antennas Realized Prototypes (A.Bellion DCT/RF/AN) Top view of mascot

  4. MASCOT antenna design and main performances • Several patch designs & radomes have been realized to measure there effects • The overall structure of antennas has been incorporated in dedicated tool to take into account all material effect • Good behavior of first prototype in terms of measured gain (better than -10dB in any directions) • Higher antenna dimension less than 105 mm with no more than 75 g mass (square or circular patch) • Need to be improved to face with frequency variations against temperature (around -100 to +100°C)

  5. ROSETTA : an ESA/DLR/CNES cometarian mission CNES is responsible of the S-band proximity link of Rosetta, for the air interface. CNES specified and procured the S band ISL Equipments ( Rx/Tx from Syrlinks – also used on « Deep Impact » of NASA- and antennas ) • RF link for rosetta mission

  6. Antenna accommodation and associated constraints • Initial accommodation analysis of patch TM/TC antenna • On the orbiter • On the lander • Realization of S band patch antennas for TM/TC orbiter and lander RF link • Optimisation of antennas accommodation to minimise environment influence • Realization of dedicated mockups for • The comet face of the orbiter • The lander • Compact Range measurements and • optimization of antennas location • on both structures

  7. Mobile Phone Technologies Application for Prox-Links and microTTC • Objectives: study highly integrated components (RFIC & Base band) issued from Mobile Phone technologies, and design adaptations to be compliant to micro Prox-Links and micro TTC requirements of very small platforms (e.g. nano & pico satellites, HAYABUSA-2 like landers). • Requirements: design a TTC transponder or Prox-Link equipement compatible in terms of frequency (S-Band EES or UHF 900 MHz), waveforms (up: PCM/PM, down: OQPSK/GMSK : for TTC; more open for Prox-Links), data rates (up: (o) 10kbps; down: (o) 1 Mbps), size and consumption adapted to constraints of very small platforms. • Calendar:2009-2010 (initial study: 3 months for identifying components according preliminary requirements), 2011 & 2012 (2x8 months studies: produce several designs & approaches, validate design through simulations, and evaluate components in hardness environment). Industrial Partner: a major ICs supplier. • Results: • Two components identified: RFIC 2G/3G/LTE (inc. LNAs, flexible frequency synthesis, DACs/ADCs, AGC, D/C cancellation, Doppler precompensation), and Base Band chip (ASIC with reprogrammable part: embedded I/F controller with RFIC, Doppler cancellation with Phase / Time recovery, Modem). • Estimated max (worst case). DC consumption (Full Duplex mode): 450mW (RFIC) + 240mW (BB) / Size: 50 mm² (RFIC) + 64mm² (BB). • On-going (2012; early 2013): finalize transponder design and approach (coherent / non-coherent), evaluate components in hardness environment

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