基于异构平台的非合作海事卫星载波同步  

Carrier Synchronization of Non Cooperative Maritime Satellite Based on Heterogeneous Platform

作　　者：吕志强 刘凯[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200444

出　　处：《工业控制计算机》2022年第10期69-71,74,共4页Industrial Control Computer

摘　　要：在非合作通信接收中,海事卫星接收系统存在大范围多普勒频偏和信号数据量大带来的识别速度慢的问题。利用GPU平台做并行加速信号识别,具有高效的性能,针对接收信号载波偏移的问题,在CPU端使用基于自相关的定时误差估计完成突发信号的定时同步后,通过信号的互相关函数提取载频估计偏差,对载波粗估计补偿;利用信号帧中独特码字和导频码,采用数据辅助的方式进行频偏精确估计,实现了BGAN信号的载波恢复,可以实现对16QAM、32QAM、64QAM的载频的精确估计,在低信噪比情况下仍能保持良好的估计性能。实验结果表明GPU+CPU异构平台的使用大大地提高了运算效率。For the problem of carrier offset of received signal, after the timing synchronization of burst signal is completed by using timing error estimation based on autocorrelation at the CPU end, the carrier frequency estimation deviation is extracted through the signal cross-correlation function, the carrier coarse estimation is compensated, and the frequency offset is accurately estimated by using the unique codeword and pilot code in the signal frame.The carrier recovery of BGAN signal is realized, and the carrier frequency of 16QAM, 32qam and 64QAM can be accurately estimated. It can still maintain good estimation performance under the condition of low signal-to-noise ratio.

关 键 词：定时同步 载波估计 数据辅助 异构平台 

分 类 号：TN927.2[电子电信—通信与信息系统]