强载波干扰条件下的罗兰-C相位编码识别研究

针对强载波干扰能够淹没罗兰-C信号,甚至严重影响罗兰-C接收机的信号处理的情况,分析了罗兰-C载波信号初相位的apFFT识别原理,对强载波干扰条件下利用全相位谱分析(apFFT)的罗兰-C信号相位编码软件识别方法进行了研究.基于apFFT谱分析方法用MATLAB对罗兰-C接收信号在强载波干扰等情况下的初相位识别进行了仿真.结果表明,apFFT谱分析方法既能识别出罗兰-C载波信号的初相位,又能分析出干扰频率及其强度,尤其信干比(SIR)在-40dB情况下仍可准确地识别出相位编码.

Research on Phase Coding Identification of Loran-C Signal under the Background of Strong CWI

Strong carrier wave interference(CWI) may submerge Loran-C signal,even the loran-C receiver fails in receiving Loran-C signal. The identification principle of the Loran-C carrier signal initial phase based on all-phase Fast Fourier Transform(apFFT) spectrum analysis is analyzed on details.After studing on the method for Phase coding identification of Loran-C signal with high carrier wave interference(CWI)based on apFFT,Computer simulation of the new method on the Loran-C received signal with strong CWI and is completed with MATLAB,showing that the apFFT can identify not only all frequency components which likes FFT but also the initial phase of the various frequency components,especially when the signal-to-interference ratio(SIR) is-40dB,it can also identify the initial phase of the Loran-C carrier signal,The results of the analysis,which are confirmed by computer simulation,are presented in a form that the novel method will be of direct use to the designers of enhanced Loran-C receivers.