基于CCSDS标准的遥感卫星下行数据纠错校验技术

Error Correction Technology Based on CCSDS Standard for Remote Sensing Satellite

卫星下传时难免会受到噪声干扰,影响数据质量.为了尽可能减少噪声干扰对卫星数据的影响,几乎所有卫星在其数据下传时都加入了容错编码,以提高卫星数据的抗干扰能力.与此相适应,地面处理系统要相应地进行纠错校验处理.本文研究了基于CCSDS标准的PN,CRC,RS和Viterbi纠错校验处理技术,论述了纠错原理,以Envisat卫星为例,给出了各种纠错校验处理技术的软件实现方法.

There is always noise disturbance during the satellite data downlink. Almost all the satellite data is coded before downlink to enhance the ability of anti-disturbance. Among those many data processing ways to reduce the influence of the noise in the signal channel, the Consultative Committee for Space Data Systems （CCSDS） provides many kinds of coding ways to improve the data quality. In this paper, we will discuss the theory of error correction for PN, CRC, RS and Viterbi based on CCSDS standard firstly, and then take the Envisat satellite as an example to show the decoder procedure. The data quality is improved greatly after the data processing.