gcc.m

广义互相关算法和最小均方自适应滤波法主要用于两路接收信号的时间延迟估计

% signal delay estimates using Cross-correlation function
clear all
k=30;
r=randn(1,2000); %noise
r1=r(1:1000);
r2=r(1001:2000);
d=zeros(1,k); %the delay of the signal

n=1:1000; 
s=10*sin(2*pi*500*(n+2)/10000)+0.1*10*sin(2*pi*500*(n+1)/10000)+0.1*sin(2*pi*500*n/10000); %主频500Hz，采样频率10KHz
x1=s+r1;
x=s+r2;
x2=[randn(1,k) x(1:1000-k)] ;          %delay signal

y=xcorr(x2,x1);    %Cross-correlation of the signal from-130 to 130
x=find(y==max(y))-1000             %延迟
i=1:1000;

subplot(311)
plot(i,x1)
subplot(312)
plot(i,x2(i))
k=1:1999;
subplot(313)
plot(k,y(k))