Total ionizing dose vulnerability analysis and on-orbit prediction for spaceborne signal processing platform

摘要

To evaluate the total ionizing dose vulnerability of spaceborne signal processing platform, an accelerated radiation experiment is set up and on-orbit prediction method is proposed. For signal processing platform which consists of SRAM-based FPGA and DSP, function parameter and current variety are the two criterion of experiment. 60Co γ radial radiation experiment indicates that total dose is about 95 k rad(Si), and DSP is the most vulnerability device. The total ionizing dose of typical satellite orbit is predicted by MULASSIS software. Different shielding schemes for electron have been simulated with Monte-Carlo method. With 3 mm aluminium reinforce, the platform can be applied in the low earth orbit(LEO) orbit (800km, 1200km) for 28 years. With 2.8 mm aluminium and 0.2mm tantalum reinforce, the platform can be applied in the (geosynchronous earth orbit)GEO orbit for 28 years.