卫星通信64APSK信号载波同步研究

Research on Satellite Communication 64APSK Signal Carrier Synchronization

针对卫星通信国际空间数据系统咨询委员会协议(CCSDS)下系统可变的编码调制以及推荐的物理帧格式,提出了一种基于CCSDS标准帧结构下的64APSK信号载波帧同步方法。通过对数据帧进行分别进行符号同步(粗同步)和数据同步(细同步)之后,接收机能够快速定位帧头位置,实现数据同步。实验结果表明,该算法操作简单、实用性强,能够适应较大范围内的载波频偏。并且在不同信噪比下具有较高的精准度。

A 64APSK signal carrier frame synchronization method based on CCSDS standard frame structure is proposed for the system variable coding modulation and recommended physical frame format under CCSDS protocol.After the symbol synchronization(coarse synchronization)and data synchronization(fine synchronization)are carried out on the data frames,the receiver can quickly locate the frame head position and realize the data synchronization.Experimental results show that the algorithm is simple and practical,being able to adapt to a wide range of carrier frequency offset.Moreover,it has high precision under different SNR.