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

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MASCOT antennas missionCommunication 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

Rx/Tx 1

Rx/Tx 2

RF Load

RF Load

MASCOT

HY-2 OME-E

HY-2

HY-2 OME-A

MESS-Antenna

Mascot Antenna 2

(redundancy)

Mascot Antenna 1

RF-link used during cruise

RF-link used during mission

CNES Antenna team development

MASCOT (DLR ) is one of the 2 landers of HAYABUSA-2 (JAXA)

CNES provide RF expertise and UHF antennas to DLR who isresponsible of the UHF Prox Link MASCOT-HB2

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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)

Top view of mascot

Available areas for MASCOTantennas

Realized Prototypes

(A.Bellion DCT/RF/AN)

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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)

-35,00

-30,00

-25,00

-20,00

-15,00

-10,00

-5,00

0,00

5,00

10,00

-180,00

-160,00

-140,00

-120,00

-100,00

-80,00 -60,00 -40,00 -20,00 0,00 20,00 40,00 60,00 80,00 100,00 120,00 140,00 160,00 180,00

Theta (°)

Gai

n (

dB

)

Mesures RHCP Phi=0° Mesures LHCP Phi=0° Mesures RHCP Phi=90° Mesures LHCP Phi=90°

Simu RHCP Phi=0° Simu LHCP Phi=0° Simu RHCP Phi=90° Simu LHCP Phi=90°

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► RF link for rosetta 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 )

ROSETTA : an ESA/DLR/CNES cometarian mission

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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

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► Objectives: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: 2009-20102009-2010 (initial study: 3 months for identifying components according preliminary requirements), 2011 2011 & 2012& 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):On-going (2012; early 2013): finalize transponder design and approach (coherent / non-coherent), evaluate components in hardness environment

Mobile Phone Technologies Application for Prox-Links and microTTC