A number of different Earth observation instruments have been included in the payload to test the platform pointing and data management capabilities. The payloads, including CHRIS are not funded by ESA but ESA is offering them a free ride on board the platform.The instrument payload includes:
- CHRIS
- a radiation measurement sensor called SREM
- a debris measurement sensor called DEBIE
- a wide angle Earth pointing camera
- a star tracker and gyroscopes
- PROBA is 3 axis stabilized which provides nadir, off-nadir
or inertial pointing. It includes:
- An autonomous (lost in space) double head star tracker
- Navigation and attitude with GPS sensor
- Momentum wheels
- Magneto-meters and magneto-torquers
- No active propulsion
- High performance RISC computer
- A Solid state mass memory of 1.2 Gbits which can be downloaded every 12 hours due to ground station visibility and data down-link capacity.
- High performance digital signal processor
- Each CHRIS image represents about 131 Mbits of data so that the 1 Gbit of mass memory that is assigned to CHRIS can store several images taken at different view angles. An S-band ground station, located in Redu, Belgium, will enable a minimum of 2 data dumps every 24 hours.
Key PROBA Characteristics:
PROBA Orbital Characteristics
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PROBA Attitude Orbital Control System (AOCS) manoeuvring
requirements
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