A Design Of Telemetry Acquisition And Telecommand Decoder System According To CCSDS Specification

With the continuous expansion of space exploration needs,complex and diverse space missions bring new challenges to satellite telemetry and telecommand system.The traditional PCM(Pulse Code Modulation)telemetry and telecommand system can't meet the current complex and volatile space missions in the channel utilization,security,data structure flexibility and so on.For this reason,CCSDS(Consultative Committee for Space Data Systems)developed a series of packet telemetry and packet telecommand criterions to meet more complex telemetry and telecommand tasks.In this paper,under the guidance of the series of criterions,we achieved an efficient,universal and flexible telemetry acquisition and telecommand decoder system on the FPGA platform.The main research content was as follows:Firstly,through the research of the domestic and foreign research situation,the paper illustrated the design direction and the requirements to achieve of the system.Secondly,the paper gave an overview of CCSDS packet telemetry and packet telecommand protocol family,and summed up the realization method,data format,and so on of the system.Based on the above protocol,the paper developed a packet telemetry and packet telecommand system conforming to CCSDS criterions on the FPGA platform,and completed hardware implementation and function verification.Thirdly,the paper summarized the realization process of the design,revealed the shortcomings in the design,and gave the idea of improving the design.The experimental results of testing and verification showed that the telemetry acquisition and telecommand decoder system had high flexibility,versatility and can be configured and clipped functions according to the specific space mission,which also had a large engineering significance.