Design Of Real-time Processing Unit Of Satellite Data Based On CCSDS Specification

With the development of aerospace technology,the design and research of aerospace electronic equipment requires a lot of cost with long research and development cycle,high reliability.It is needed to conduct rigorous testing for aerospace products.The ground test system plays an important role in aerospace research,which ensure the system be fully and completely tested.The test quality and test speed are important indicators of ground testing system.The satellite payload subsystem is one of the core of the satellite.On the one hand,it collects the telemetry data of the payload and sends the processed data to the ground system.On the other hand,it receives remote control commands from the ground system,analyzes instructions,and then makes the satellite system adjustments.Therefore,testing the payload data manager subsystem is a important problem.The paper designs the real-time data processing system for satellite data reception based on FPGA platform,solving the shortcomings of software system of ground testing,such as low real-time process and low software modularity.It first studies and analyzes the background of the research,the present situation,the purpose and significance of the subject,and deeply researches the organization structure and content of the data management system.In view of the high reliability of the system data processing and transmission,the LDPC coding and scrambling technology,CFDP file reliability transfer protocol are used in space.The system can complete the real-time analysis function of the downlink data processing of the payload sub-system,restore the valid data of the CCSDS frame and realize the real-show,the report of analysis.The design implements the frame synchronization,de-scrambling,LDPC decoding,de-framing,decoding CFDP frame,unpacking and other module functions.The design takes full use of the FPGA of parallel processing,and solves the problems of data processing software in real-time processing and IP(Intellectual Property)module reuse.The test efficiency is improved.The system is implemented to improve the level of automation,and lay the foundation for the reliability transmission of CFDP file transfer protocol.