互相关

Question

我一直试图找到时移信号响应和另一个信号响应之间的互相关作为参考，但发现很难让我的时移与xcorr函数一致。 matlab代码粘贴在下面，如果有人可以就如何实现xcorr函数提出建议，以便我可以确定两个信号响应相关的时移，我将不胜感激。谢谢

clear all;
clc;
FS = 100e6;



figure(1)
AMP8 = importdata('av250nu.txt');
time8  = [1:length(AMP8)] / FS;
c=find(time8==0.14e-4);
plot(time8(1:c)',AMP8(1:c));
ylabel('Amplitude(V)')
xlabel('Time of flight(s)')

figure(2)
AMP = importdata('3kknu.txt');
time  = [1:length(AMP)] / FS;
c=find(time==0.14e-4);
plot(time(1:c)',AMP(1:c));
title('reference')
ylabel('Amplitude(V)')
xlabel('Time of flight(s)')

figure(3)
AMP1 = zeros(2000,1);
time1 = zeros(2000,1);
time11 = zeros(2000,1);
AMP1(1:320)= AMP(1:320);
time1(1:320) = time(1:320);
plot(time1,AMP1);
ylabel('Amplitude(V)')
xlabel('Time of flight(s)')

figure(4)
AMP2 = zeros(2000,1);
time2 = zeros(2000,1);
time21 = zeros(2000,1);
AMP2(321:640) = AMP(321:640);
time2(321:640) = time(321:640);
time21(321:640) = time2(321:640);
plot(time21,AMP2);
ylabel('Amplitude(V)')
xlabel('Time of flight(s)')

figure(5)
AMP3 = zeros(2000,1);
time3 = zeros(2000,1);
time31 = zeros(2000,1);
AMP3(641:960) = AMP(641:960);
time3(641:960) = time(641:960);
time31(641:960) = time3(641:960);
plot(time31,AMP3);
ylabel('Amplitude(V)')
xlabel('Time of flight(s)')

figure(6)
AMP4 = zeros(2000,1);
time4 = zeros(2000,1);
time41 = zeros(2000,1);
AMP4(961:1280) = AMP(961:1280);
time4(961:1280) = time(961:1280);
time41(961:2000) = time4(961:2000);
plot(time41,AMP4);
ylabel('Amplitude(V)')
xlabel('Time of flight(s)')

figure(75)
time5=zeros(2000,1);
p = zeros(2000,1);
time5(1:320)= time1(1:320); 
time5(321:640)=time21(321:640);
time5(641:960)=time31(641:960);
time5(961:2000)=time41(961:2000);

plot(time5,AMP);

 p(1:2000) = time5;
 p(1:16384) = AMP;
 plot(p);
 grid on;



 figure(95)
 [Z,lags] = XCORR(p(1:16384,1),AMP8,'biased');
 plot(lags,Z);

Answer 1

尝试找到最大相关值，这是所需的移位。

[zmax, i] = max(Z);
t = lags[i];