Design Of Efficient And Reliable Embedded System For Micro/Nano Satellite Data Management

Due to the constraints of power consumption and space,micro/nano satellites are difficult to implement independent data management systems.Currently,NAND Flash with low power consumption integrated in On board Computer is widely used in micro/nano satellite data management.Although NAND Flash has the advantages of high storage density and fast reading & writing speeds.However,in space environment,the direct use of NAND Flash for data management has the disadvantages of low reliability and low efficiency.Therefore,how to realize a highly efficient and reliable embedded data management system based on NAND Flash on micro/nano satellites is an urgent problem.This paper studies the compression algorithm of micro/nano satellite telemetry data,proposes an efficient and reliable data storage method based on NAND Flash,and designs an embedded data management system for micro/nano satellites.The main research work of the paper includes:(1)According to the characteristics of micro/nano satellite telemetry data,a method of combining telemetry frames at different times into a "telemetry matrix" and recombining the frames in the direction of the matrix column to improve the data compression effect is proposed.Based on this method,this paper completes the compression algorithm for micro/nano satellite telemetry data.By analyzing the compression effect of telemetry data,the effectiveness of the algorithm is proved,and the efficient storage of telemetry data is realized.(2)According to the characteristics of telemetry data read-write operation,this paper designs a micro/nano satellite file system,which is suitable for NAND Flash.Based on the file system,combined with reliability requirements of micro/nano satellites in space environment,this paper studies file system garbage collection,NAND Flash bad block management,and dual file system redundant backup storage data.These methods effectively improve the reliability of NAND Flash data management system in space environment.(3)This paper completed the design and development of an efficient and reliable data management embedded system prototype for micro/nano satellites,and set up a test environment to test the performance and reliability of the data management system.The test results show that the system designed in this paper can significantly improve the access efficiency and reliability of micro/nano satellite data management.The results prove the effectiveness of the system.The research of this paper has important reference and practical value for the design of micro/nano satellite data management system.