CAJ | 학술논문

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。
유우색산효응영향,라란C신호재수하전파시각빈솔분량상위개변량불동,도치합성신호포락발생형변,주기식별시수요진행포주차보상처리。위차,재분석라란C신호수하전파색산특성기출상,통과방진급출료표준신호유공기입수후재수중불동심도접수도적신호재파전오주반봉치비。연후,결합상술방진결과,근거최소균방사상설계료일충융입포주차보상적용우수하접수신호식별적간단가행주기식별방법。시험결과표명,소설계주기식별보상방법능구준학실현수하접수라란C신호적주기식별,제고접수궤정위정도,대탁전라란C접수궤적수하응용영역구유중요의의。
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.