CCSDS链路帧识别技术

Recognition Technology for CCSDS Data Link Frame

提出并研究CCSDS链路帧识别技术。分析CCSDS链路层协议特征,提出一种识别流程。对于遥控传输帧,利用基于模式串的匹配算法对命令链路传输单元进行盲同步;对于遥测传输帧,提出采用基于校验多项式的识别方法,在扰码识别后,利用链路层帧长特征对Reed-Solomon编码的交织深度进行初始判别,并采用伽罗华域的傅里叶变换对识别结果进行验证。文中还分析了不同误码率情况下算法的识别性能。实验结果表明,算法可以对CCSDS链路层协议帧进行有效识别。

The recognition technology for CCSDS data link frame is proposed. Characteristics of data link protocol are analyzed and a recognition flowsheet is given. To the telecommand transfer frame, a blind synchronization method based on pattern matching is introduced for Communications Link Transmission Unit. To the telemetry and Advanced Orbiting System transfer frame, a recognition and synchronization algorithm based on syndrome is examined. After the discrimination of the disturbed code, the frame length is used to roughly judge the interleaving depth of Reed-Solomon code, and then the Galoias Field Fourier Transform is employed to verify the recognition results. Under different bit error rates conditions the simulations are exhibited which prove that the method is effective for the CCSDS data link protocol.