data transmission with an optical link between a
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Data transmission with an optical linkbetween a nanosatellite and the groundF. 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, ...
Pico Nano Micro Mini Moyen Gros
Hubble Space Telescope
11 tonnes
Corot
630 kg
Microscope
303 kg
ISO
1800 kg
Suncubes
35 g
Robusta
1,3 kg
What is a cubesat?
Standard platform to make space reachablefor 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 technologiesSmall scientific missions
What is a cubesat?
Standard platform to make space reachablefor 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 technologiesSmall scientific missions
The « new space » revolutionExample: Planet labs, 190 satellites in orbit today
Nice / le Ray stadiumbeing dismantled in 2017
The « space data highway »
• LASER comm. between satellites: data rates > 1Gbps
• Demonstration between SENTINEL 1A and Eutelsat on 2016 June 2nd
• No cluttering of radio frequencies
• Difficult to intercept
• Higher data rates
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 radios @900MHz• 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-boardcomputer after a software update
CSUCA
Where do we stand?
• Mission definition in progress:
• 1 Sicence goalatmosphere pollution measurements
• 1 Technology goalLASER communications
• Platform choice1U
• 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 Internethttps://nanosat.univ-cotedazur.fr
• 1 compte twitter uca3_satlire : « UCA cube sat »
Can we do the same as OCSD-1in a different way?
Corner cube was invented in 1917 by Henri Chrétien(Obs. Nice) !
The idea:
Ground
Satellite
Ground
Satellite
Advantages:• No LASER in the satellite (less
power)• Corner cube larger angle
acceptance (~10o)
Difficulties• Complexity shifted to
ground station
Corner cube (retro-reflector)Prismatic
Ball lens
Cat’s eye
Telecentric cat’s eyeIllustration from Rabinovitch et al. 2004
Light modulator
Navy Modulating Retro-reflector ~10MHz(Goetz 2010)
LCOS ~1KHz(cristaux liquides)
~100KHz
What are our needs?• Form factor 1/1.5/2/3U?
• What electrical power is needed?
• SCAO (attitude control)
• Ground station (Calern telescope?)
• On-boardcompuating?
• GPS
• Radio
Work done
• CNES visit in 2016
• 3 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 withMontpellier
Work in progress• 1e 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 Sophiasur le prototype de station Sol radio
• 1er 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
Work in progressPolytech Nice student’s project:Build a prototype radio ground station
SatNOGS