The Research And Implementation Of Fault-tolerance For On-board Image Compression Encoder

With the development of deep-space exploration,the amount of space sensing image increases dramatically, which results in the contradiction between limited communication bandwidth and high-definition images transport demand. The statellite image compression encoders of high reliability become the best way to resolve this contradiction. However, statellite image compression encoders based on FPGA is susceptible to the influence of SEU, because of the radiation of single particle in deep-space and the special structure of modern FPGA component. Therefore, the project of radiation-tolerant and fault-tolerant for statellite image compression encoders is very important.According to the requirement of a deep-space exploration project, we design a statellite image compression encoder based on DWT and SPIHT algorithm by Xilinx Virtex-4 FPGA. On this basis, the radiation-tolerant and fault-tolerant for statellite image compression encoder is detailedly studied in the thesis. The main work of this paper is as follows:On the basis of a detailed study of the radiation-tolerant and fault-tolerant principle for statellite image compression encoder, many protection methods are proposed in this thesis, such as Triple Modular Redundancy(TMR), Error Detection And Correction(EDAC), signal frame independency, security state machine protection, image source exception handling, etc. In TMR designing process, using advanced Xilinx Triple Modular Redundancy(XTMR) replace of Triple Modular Redundancy(TMR) to reducing Signal Event Effect(SEE) on the voting circuit. Greatly reducing state transition error probability by designing on one hot encode(OHE) and Triple Modular Redundancy(TMR). For a 3 bit finite state machine, this program can correct 1 bit or 2 bits errors and some 3 bits errors.In order to verify the effectiveness of the radiation-tolerant and fault-tolerant method, we design a test platform which can simulate abnormal images, and simulating the Signal Event Effect by Modelsim to test TMR and EDAC. The test results show that statellite image compression encoder has meet the design requirement on reliability, performance, resources, etc. Be able to anti the Signal Event Effect(SEE) accurately.