Session
Technical Session V: Lessons Learned - In Success and Failure
Abstract
The number of uses for imaging devices in space is rapidly increasing. To evaluate suitability for space-based surveillance and star tracker operation, an experimental payload was developed based on an experimental Charge Coupled imaging Device (CCD). This payload was to have flown on the small STRV-1d satellite (a joint US and British program) to collect data during 600+ minute highly elliptical orbits. These orbits were intended to expose the CCD to high radiation levels and possibly significant solar flare events. The main objective of the experiment was to measure the degradation of the Charge Transfer Efficiency (CTE) of the device, and to characterize its overall performance in an orbit that would provide a significant radiation threat. Due to the inherent complexities and fragility of experimental CCD devices, many hardware and software obstacles were encountered and many lessons were learned. Vibration and environmental testing issues were of particular significance. By underestimating the difficulty of mechanical mounting, cooling, software operation and clocking, and environmental stability, our project did not make satellite integration deadlines despite considerable effort.
Minimizing Risk Associated with Imaging Payloads: Lessons Learned from a CCD Experiment Gone Awry
The number of uses for imaging devices in space is rapidly increasing. To evaluate suitability for space-based surveillance and star tracker operation, an experimental payload was developed based on an experimental Charge Coupled imaging Device (CCD). This payload was to have flown on the small STRV-1d satellite (a joint US and British program) to collect data during 600+ minute highly elliptical orbits. These orbits were intended to expose the CCD to high radiation levels and possibly significant solar flare events. The main objective of the experiment was to measure the degradation of the Charge Transfer Efficiency (CTE) of the device, and to characterize its overall performance in an orbit that would provide a significant radiation threat. Due to the inherent complexities and fragility of experimental CCD devices, many hardware and software obstacles were encountered and many lessons were learned. Vibration and environmental testing issues were of particular significance. By underestimating the difficulty of mechanical mounting, cooling, software operation and clocking, and environmental stability, our project did not make satellite integration deadlines despite considerable effort.
