海事五代卫星反向信号解调技术  

Reverse signal demodulation technology of maritime fifth generation satellite

作　　者：郭微光 冯朔 李黛云 GUO Wei-guang;FENG Shuo;LI Dai-yun(PLA Unit 91001,Beijing 100161,China;No.54 Research Institute,China Electronics Technology Group Corporation Limited,Shijiazhuang 050081,China)

机构地区：[1]中国人民解放军91001部队,北京100161 [2]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《计算机工程与设计》2023年第6期1670-1677,共8页Computer Engineering and Design

摘　　要：根据运行在Ka频段的第五代海事卫星系统(简称海五)反向信号的总体特征,提出利用共轭对称序列相关法检测方案进行反向信号相关检测。针对反向信号解调,提出采用基于FFT的频偏估计算法进行频偏纠正,根据第一个导频符号及调制样式确定相偏纠正,采用符号同步和载波同步两个环路进行信号同步,实现反向信号解调的目的。实验结果表明,所提方法相位估计误差较小,最佳采样点偏移小于半个符号时对解调结果不产生显著影响。这对了解和掌握全球最新一代卫星通信技术的发展趋势,促进我国Ka频段卫星通信业务开展,安全应急通信发展,推动我国海洋战略发展进步具有现实意义。According to the overall characteristics of the reverse signal of the fifth generation maritime satellite system(referred as Hai V)operating in the Ka band,the conjugate symmetric sequence correlation detection scheme was proposed to detect the reverse signal,and the frequency offset estimation algorithm based on FFT was proposed to correct the frequency offset,and the phase offset correction was determined according to the first pilot symbol and modulation style,and the two loops of symbol synchronization and carrier synchronization were used to synchronize the signal to achieve the purpose of reverse signal demodulation.Experimental results show that the phase estimation error of the proposed method is small,and the optimal sampling point offset is less than half a sign without significant effect on the demodulation results.This is of practical significance for understanding and mastering the development trend of the world’s latest generation of satellite communication technology,promoting the development of Ka-band satellite communication services,the development of safe emergency communications,and the deve-lopment and progress of marine strategy.

关 键 词：海事五代卫星 卫星通信 反向信号 信号检测 信号解调 海洋战略发展 应急通信 

分 类 号：TN927[电子电信—通信与信息系统]