水下接收罗兰C信号周期识别补偿方法研究  

Study on Cycle Identification Compensation Method for Underwater Receiving Loran-C Signal

作　　者：吴绳正[1,2] 刘敬虎 朱银兵[2] 李豹[2] 

机构地区：[1]海军司令部航海保证部 [2]海军工程大学电气与信息工程学院 [3]91576部队

出　　处：《舰船电子工程》2011年第11期68-71,共4页Ship Electronic Engineering

基　　金：国家自然科学基金(编号:61004126)资助

摘　　要：由于色散效应影响,罗兰C信号在水下传播时各频率分量相位改变量不同,导致合成信号包络发生形变,周期识别时需要进行包周差补偿处理。为此,在分析罗兰C信号水下传播色散特性基础上,通过仿真给出了标准信号由空气入水后在水中不同深度接收到的信号载波前五周半峰值比。然后,结合上述仿真结果,根据最小均方思想设计了一种融入包周差补偿的用于水下接收信号识别的简单可行周期识别方法。试验结果表明,所设计周期识别补偿方法能够准确实现水下接收罗兰C信号的周期识别,提高接收机定位精度,对拓展罗兰C接收机的水下应用领域具有重要意义。Because of the influence of dispersion effects,phase variation of each frequency component is different when Loran-C signal is propagating under water,the result is that envelop of composite signal is altered and envelop cycle difference（ECD） compensation is needed when processing.Therefore,after the analysis of the dispersion characteristics of underwater receiving Loran-C signal,the former five half-cycle peak ratios（HCPR） under different depths when standard signal propagates from air into the water are given by simulation.After that,with the simulation results,a cycle identification method contained ECD compensation and used for underwater receiving Loran-C signal is designed according to minimum mean square idea.The experiment results show that the designed cycle identification compensation method can identify the underwater receiving signal exactly and enhance the position precision,which has great significance to underwater applications of Loran-C receiver.

关 键 词：罗兰C 水下接收 色散效应 周期识别 

分 类 号：TN961[电子电信—信号与信息处理]