A Research On Key Technologies For The High Reliability On-board Parallel System Based On Multiple DSPs

Space applications are becoming more and more complex and theamount of data is increasing dramatically with the development of spacetechnology. Applications like large size image processing and autonomousnavigation urge the on-board system to evolve from control flow centeredto data flow centered. Meanwhile the impact of single event effects onon-board systems becomes more and more significant with the shrinking oftransistor geometry. Under this background the research on highperformance reliable on-board systems is especially important.A high reliability on-board parallel system based on multiple DSPsand FPGAs is proposed in this thesis and radiation hardening designs areapplied to the system. In this system data are transferred directly betweenDSPs through EMIF and HPI interfaces while control signals areexchanged through key registers among subsystems and the control unit.Mitigation methods including error correction code, watchdog andprogram jump detection are proposed in this thesis. This thesis presents a―2parallel+1standby‖running mode in which two DSPs work in paralleland the rest one is standby. The standby DSP replaces the fault DSP whenan unrecoverable error is detected by radiation hardening modules.We applied a2048-point FFT on this system to evaluate theperformance. Then we injected some errors into the system and repeatedthe FFT application. The results show that the system reaches a speedup of1.46and the average recovery time takes up49.48%of execution time.