between a nanosatellite and the ground

Transcription

1 Data transmission with an optical link between a nanosatellite and the ground F. Millour, M. Benabdesselam, P. Bendjoya, P. Berio, M. Carbillet, F. Cauneau, A. Chiavassa, J.-Y. Dauvignac, L. Deneire, P. Exertier, F. Falzon, P. Gourbesville, S. Lagarde, T. Lanz, F. Mady, F. Martinache, D. Mary, A. Memin, G. Metris, P. Michel, L. Rolland, X. Roser, A. Soulain, R. Staraj, P. Stee,...

2 Suncubes Robusta Microscope Corot ISO Hubble Space Telescope 35 g 1,3 kg 303 kg 630 kg 1800 kg 11 tonnes Pico Nano Micro Mini Moyen Gros

3 What is a cubesat? Standard platform to make space reachable for universities 10x10x10 cm cube (1 unit or 1U) 1 W available electrical power 1.3 kg You can combine cubes (1.5U, 2U, 3U, ) Reasonable budget for an university (1U = 250 k ) Real-life project to train students TRL of new technologies Small scientific missions

4 What is a cubesat? Standard platform to make space reachable for universities 10x10x10 cm cube (1 unit or 1U) 1 W available electrical power 1.3 kg You can combine cubes (1.5U, 2U, 3U, ) Reasonable budget for an university (1U = 250 k ) Real-life project to train students TRL of new technologies Small scientific missions

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6 The «new space» revolution Example: Planet labs, 190 satellites in orbit today Nice / le Ray stadium being dismantled in 2017

7 The «space data highway» LASER comm. between satellites: data rates > 1Gbps Demonstration between SENTINEL 1A and Eutelsat on 2016 June 2 nd No cluttering of radio frequencies Difficult to intercept Higher data rates

8 OCSD-1 NASA mission 1.5 U 6W LASER for downlink (power dependent on pointing accuracy) LASER uplink receiver Laser ranging Earth-monitoring camera Ranging camera Retro-reflectors, LED beacons 2 SDR GPS Full-featured ADCS including Magnetometer, Gyro, Sun sensors, Magnetic coils, On-board computer, Earth sensor, Reaction wheels, 2 star trackers Thruster Launched in 2015 Failure of the on-board computer after a software update

9 CSUCA Where do we stand? Mission definition in progress: 1 Sicence goal atmosphere pollution measurements 1 Technology goal LASER communications Platform choice 1U 7 partner labs / schools (LEAT, ParisTech Sophia, Polytech Sophia, Géoazur, I3S, LPMC, Master MAUCA) 2 companies: Sophia Conseil & Thalès Alenia Space Other universities Université de la Sapienza CSU Toulouse et CSU Grenoble 1 Site Internet 1 compte twitter uca3_sat lire : «UCA cube sat»

10 Can we do the same as OCSD-1 in a different way? Corner cube was invented in 1917 by Henri Chrétien (Obs. Nice)! The idea: Ground Ground Satellite Satellite Advantages: No LASER in the satellite (less power) Corner cube larger angle acceptance (~10 o ) Difficulties Complexity shifted to ground station

11 Corner cube (retro-reflector) Prismatic Cat s eye Ball lens Telecentric cat s eye Illustration from Rabinovitch et al. 2004

12 Light modulator LCOS ~1KHz (cristaux liquides) ~100KHz Navy Modulating Retro-reflector ~10MHz (Goetz 2010)

13 What are our needs? Form factor 1/1.5/2/3U? What electrical power is needed? SCAO (attitude control) Ground station (Calern telescope?) On-board compuating? GPS Radio

14 Work done CNES visit in Polytech students 2016/2017 CSUCA set-up organisation, offices, Projet manager: S. Ottogalli Documentation Montpellier cubesat meeting Paris cubesat meeting Set-up of a collaboration with Montpellier

15 Work in progress 1 e stagiaire de M2 arrivée début Janvier à Lagrange : Manel Maamri Étude système, définition et spécifications mission, documentation, gestion de projet. 4 étudiants de M1 Polytech Nice Sophia sur le prototype de station Sol radio 1 er Audit du CNES le 30 Janvier : labellisation JANUS Formation à IDM / CIC les 5/6/7 Février au CNES 5 autres stagiaires M1 et M2 attendus entre Février et Juin Implantation mécanique (M1) Arthur Stibbe en Mars à Lagrange Charge utile scientifique (M2) en attente Charge utile + station sol communications LASER (M2) en attente Station Sol radio (M2) pas encore d étudiant GPS (GNSS / M2) Florian Zedek en Mars à Geoazur Revue de projet de phase 0/A en Juin 2017

16 Work in progress Polytech Nice student s project: Build a prototype radio ground station SatNOGS

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