ex6.m

循环自相关函数工具箱

clear;
clc;
% t=0:1/600:1023/600;
% A=1;B=1;fb=7;fa=100;
% x=A*(1+B*cos(2*pi*fb.*t)).*cos(2*pi*fa.*t);
% figure(1)
% plot(t,x)
% alpha=2*pi/300;
load('E:\169.mat');  %%读取数据
% speed=1796;    %motor rotational speed(rpm)
sig1=X169_DE_time';
ln=length(sig1);
n=1000;
t=0:1/12000:(n-1)/12000;
figure(1)
plot(t,sig1(1:n))
xlabel('\fontsize{9}\fontname{标楷体}时间/s');ylabel('\fontsize{9}\fontname{标楷体}幅值/um');
max_tau=0;
alpha=2*pi/12000;
R=cyclic_autocorrelation(sig1(1:n),alpha,max_tau);
y=1000*R.*conj(R);
% ff=600*(0:1023)/512;
ff=0:1:6000-1;
figure(2)
% plot(ff(1:150)/(2*pi),y(1:150));
plot(ff(1:3000),y(1:3000));
xlabel('\fontsize{9}\fontname{标楷体}循环频率 /Hz');ylabel('\fontsize{9}{R_{x}}^{\alpha}(0) /um^2');