Vibration signal generation and processing based on MATLAB Doppler effect

1、 Content abstract

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374- Can communicate 、 consulting 、 Answering question

2、 Content description

Doppler effect (Doppler effect) In memory of the Austrian physicist and mathematician Christian · John · Doppler （Christian Johann Doppler） And named , He is in 1842 This theory was first put forward in . The main content is that the wavelength of the object radiation changes due to the relative motion of the wave source and the observer . In front of the moving wave source , The wave is compressed , The wavelength becomes shorter , The frequency becomes higher （ blue shift blue shift）; Behind the moving wave source , Will have the opposite effect . The wavelength becomes longer , The frequency becomes lower （ Redshift red shift）; The higher the speed of the wave source , The greater the effect . According to Bo Hong （ Or blue ） The degree of displacement , The velocity of the wave source moving in the observation direction can be calculated . [1] 
The shift of the stellar spectral line shows the speed of the star moving in the observation direction , Unless the speed of the wave source is very close to the speed of light , Otherwise, the degree of Doppler shift is generally very small . All wave phenomena have Doppler effect .

3、 Simulation analysis

tic;clc;close all;clear all;

%% The vibration signal passes through Doppler_Generator Function simulation into dynamic signal
fs=55000 
c=340;V0=80;x0=80;r=1;
load 170.mat
X170_DE_time=X170_DE_time(1:100000);
X170_DE_time=X170_DE_time'
[~,~,~,Doppler_bearing_sig]=Doppler_Generator(X170_DE_time,fs,c,r,x0,V0);
%% Filter processing
fs=50000;
wp=[1000,4000];
[b,a]=butter(4,wp/(fs/2));
f_sig=filter(b,a,Doppler_bearing_sig);
figure
plot(f_sig);xlabel(' Distorted signal points ');ylabel(' Distorted signal amplitude ');
title(' Modulated target distortion signal ');
% %%   The Fourier transform , Convert time domain signal into frequency domain signal
% [f1,Yf1] = fuliye(f_sig,fs,0);
% figure;plot(f1,Yf1);

 

4、 Reference paper

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