SpaceTech Sensors
SpaceTech Coarse Earth Sun Sensor CESS: While in safe-mode, preservation of a spacecraft is the number one priority. Essential AOCS input needs to be provided by high reliable sensors. For that purpose, SpaceTech developed a thermo-optical Coarse Earth and Sun Sensor (CESS).
![SpaceTech equipment electronics and sensors CESS working principle](/fileadmin/user_upload/Equipment/Electronics_and_Sensors/Sensors/SpaceTech_CESS-working-principle_accordion_page-level-c_513x309px.jpg)
The CESS is a passive sensor that provides spacecraft orientation at any time, crucial for SC deployment, de-spin and survival in safe mode.
A set of 6 orthogonal accommodated CESS heads is used to determine the relative earth and sun vector:
- Perform a continuous measurement of the temperatures of all black and mirror reference surfaces
- Extrapolate temperatures to steady-state
- Estimate the irradiated infra-red and solar flux, for both black and mirror OSR via their respective values for α and ε
- Deduce IR (solar) flux imbalance for opposing CESS heads and construct earth (solar) vector
![SpaceTech equipment electronics and sensors CESS](/fileadmin/user_upload/Equipment/Electronics_and_Sensors/Sensors/SpaceTech_CESS_accordion_page-level-c_513x309px.jpg)
- Altitude information during de-spin and earth-oriented safe-mode
- Robust, lightweight, easy to accommodate
- Zero power consumption
- Excessive flight heritage
CESS deliverables
Standard HW:
- 6 FM + 2 spare CESS heads incl. protective caps
- Flight S/W algorithm
Options:
- Customer specific acceptance testing
- Mission specific mechanical interfaces
- AIT support
- Performance/thermal in-orbit simulator
![SpaceTech equipment electronics and sensors CESS missions](/fileadmin/user_upload/Equipment/Electronics_and_Sensors/Sensors/SpaceTech_Grace-follow-on-satellites_accordion_page-level-c_513x309px_Freigabe-klaeren-GFZ.jpg)
The SpaceTech CESS has been used in numerous successful LEO space missions e.g., CHAMP, GRACE FO, TerraSAR-X, TanDEM-X, Paz, Cryosat, SWARM, Sentinel-6.
SpaceTech CESS .step model
Find more details in our CESS brochure: