PROBA Project for Onboard Autonomy Verhaert Design and

PROBA Project for On-board Autonomy Verhaert Design and Development nv European Space Agency Hogenakkerhoekstraat 9 Directorate of Technology and Operations B 9150 Kruibeke ESTEC Tel. 03/250. 19. 37 Fax 03/254. 10. 08 e-mail : jo. bermyn@verhaert. com The Netherlands e-mail : fteston @etsec. esa. nl www. verhaert. com October 2000 Slide

PROBA Introduction PRoject for On Board Autonomy October 2000 Slide 2

PROBA: Project Organisation • Customer: ESA • Prime Contractor: Verhaert Design & Development (BE) • Subcontractors: Spacebel (BE), Space Application Services (BE), Space Systems Finland (Fi), SIL (UK), Universite de Sherbrooke (Can), Officine Galileo (It) • Suppliers October 2000 Slide 3

Proba : Mission • ESA technology demonstration program • Operational Autonomy demonstration – Planning-scheduling, resource management, FDIR, On-board Flight Dynamics • New Technology Demonstration – Powerfull avionics system, ERC 32 and DSP, Li-Ion Battery, 3 D Package Technology, GPS Attitude Determination • Payload Demonstration – Main instrument (CHRIS) challenging the autonomy and ACNS – SREM, DEBIE, HRC, WAC • Internet Access October 2000 Slide 4

Proba : Key figures • • • Mass : 100 kg Volume : 80 cm x 60 cm Power : 40 to 90 W Compatible with PSLV / ASAP 5 High pointing accuracy ACNS – Absolute pointing error 150 arcsec – Relative pointing error 5 arcsec over 10 sec October 2000 Slide 5

PROBA Block Diagram October 2000 Slide 6

PROBA Subsystems • Honeycomb structure • Passive thermal control • Body mounted solar panels with Ga. As cells • 28 V regulated power bus, 9 Ah Lithium-Ion battery • S-band communication system ( 4 kbit/s uplink, 1 Mbit/s downlink) • ERC-32 based DHS • S-band small ground station (2, 4 m dish) October 2000 • 3 -axis stabilised ACNS – 4 reaction wheels – 4 magnetotorquers – 2 three-axis magnetometers – 1 Star Tracker with 2 optical heads – 1 Star Tracker as part of CHRIS – 1 GPS with 4 antennas Slide 7

PROBA Accommodation October 2000 Slide 8

PROBA flight structure October 2000 Slide 9

Proba launch / orbit • • • Low Earth Orbit (LEO) 560 x 720 km Near polar with an inclination of 97. 7 ° Polar Satellite Launch Vehicle (PSLV) Launch by Antrix/ISRO, India Launch site : Shriharikota Scheduled launch 2001 October 2000 Slide 10

PROBA Avionics • Dual ERC 32 based avionics for ACNS and DHS/TT&C • Payload Computer – DSP (21020) for image processing/compression – Integrated mass memories (for HK and Science data) – Smart Instrumentation points and house keeping bus experiment • TT&C in S-band CCSDS October 2000 Slide 11

PROBA Power • Ga As Solar Arrays (90 W peak power) • 36 Li-ion cells, 9 Ah, 25 V • Central protected power distribution with regulated bus. October 2000 Slide 12

PROBA ACNS • ACNS – 3 -axis control: high accuracy pointing and manoeuvring • (absolute pointing accuracy better than 360 arcsec) – – Gyro-less attitude control Navigation function (autonomous orbit estimation) Guidance function (f. e. Fly By predictions) ACNS automated software generation • ACNS Technology demonstrations: • Star Tracker • Resonating Gyroscope • GPS Attitude Determination October 2000 Slide 13

PROBA ACNS • ACNS Block Diagram October 2000 Slide 14

ACNS Components • GPS receiver – Position and velocity determination, Time synchronization with UTC, attitude determination experiment (SSTL) • Redundant star tracker with dual head – High Accuracy (arcsec range), autonomous attitude determination from “Lost in Space” situation, compatible with tumbling rates of up to 1. 2°/sec • 4 Miniature Reaction Wheels – Storage capacity 0. 04 Nms, – Momentum 5 m. Nm • 2 Magnetometers • 4 Magnetotorquers October 2000 Slide 15

PROBA Payloads • Compact High Resolution Imaging Spectrometer – 25 m resolution – 19 spectral bands (415 - 1050 nm) – Bi-directional Reflectance Distribution Function measurements October 2000 Slide 16

PROBA Payloads Imaging with CHRIS (BRDF measurements) October 2000 Slide 17

PROBA Payloads Imaging with CHRIS (BRDF measurements) October 2000 Slide 18

PROBA Imagers • High Resolution Camera • Panchromatic • 10 m ground resolution • 3 D Packaging Technology CCD • Wide Angle Camera • Miniaturised (7 x 7 x 6 cm) • CMOS Active Pixel Sensor October 2000 Slide 19

PROBA Earth Environment Instruments SREM • Standard Radiation Environment Monitor • Objectives: – Earth radiations environment – Space weather SREM DEBIE • Debris In-orbit Evaluator • Objectives: – Sub-millimeter debris population – Knowledge and models DEBIE October 2000 Slide 20

PROBA Payloads • Earth Environment Instruments DEBIE SREM October 2000 Slide 21

PROBA Ground Station • S-Band • 2. 4 m Transportable Antenna (Redu, BE) • ESOC network compatible: packet TC/TM, SCOS Spacecraft control • Data Distribution via network/web • “Light-out” ground station October 2000 Slide 22

PROBA Development • STM – Table model Avionics – PFM • Integrated SVF/SCOS based development (SW, EGSE, spacecraft simulator, operations) • Automated SW generation for ACNS October 2000 Slide 23

PROBA Status October 2000 Slide 24