Loran-C信号中直达波与反射波的提取方法研究  

A Study on the Extraction Method of Direct Wave and Reflected Wave in Loran-C Signal

作　　者：黄显良[1,2] 戚浩[1,2] 郁建芳[1,2] 谢石文[1,2] 王琐琛[1] 杨波[1] 夏仕安[1,2] 

机构地区：[1]安徽省地震局,安徽合肥230031 [2]大别山地震监测预报实验场,安徽六安237001

出　　处：《地震工程学报》2017年第4期662-666,共5页China Earthquake Engineering Journal

基　　金：地震科技星火计划(XH15021);安徽省自然科学基金面上项目(1708085MD93);中央引导地方专项资金科技惠民项目(2016080802D117)

摘　　要：Loran-C信号中直达波和反射波到时差的提取是利用其进行测距的关键所在。通过分析Loran-C信号实测波形与理论波形的特征,认为两者所包含的直达波信号一致。基于此特征,通过波形相减的方法从实测Loran-C信号中剔除理论直达波信号,并结合互相关方法求解出直达波和反射波的到时差。Determining the difference in arrival time between direct waves and reflected waves in the Loran-C signal is crucial for effectively using it for ranging.Based on the analysis of waveform characteristics of the measured waves and theoretical waves in Loran-C signal,it is considered that the direct wave signal included in the measured Loran-C signal is consistent with that in the theoretical signal.Therefore,the theoretical direct wave signal can be removed from the measured Loran-C signal via waveform subtraction,then the difference in arrival time between direct waves and reflected waves can be calculated by using cross-correlation method.

关 键 词：Loran-C信号 到时差 互相关 

分 类 号：P315.7[天文地球—地震学]