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matlab 多普勒效应产生振动信号和处理
2022-07-03 00:41:00 【51CTO】
1、内容简介
略
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2、内容说明
多普勒效应 (Doppler effect) 是为纪念奥地利物理学家及数学家克里斯琴·约翰·多普勒(Christian Johann Doppler)而命名的,他于1842年首先提出了这一理论。主要内容为物体辐射的波长因为波源和观测者的相对运动而产生变化。在运动的波源前面,波被压缩,波长变得较短,频率变得较高(蓝移blue shift);在运动的波源后面时,会产生相反的效应。波长变得较长,频率变得较低(红移red shift);波源的速度越高,所产生的效应越大。根据波红(或蓝)移的程度,可以计算出波源循着观测方向运动的速度。 [1]
恒星光谱线的位移显示恒星循着观测方向运动的速度,除非波源的速度非常接近光速,否则多普勒位移的程度一般都很小。所有波动现象都存在多普勒效应。
3、仿真分析
tic;clc;close all;clear all;
%% 振动信号通过Doppler_Generator函数仿真成动态信号
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);
%% 滤波处理
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('畸变信号点数');ylabel('畸变信号幅值');
title('调制后的目标畸变信号');
% %% 傅里叶变换,将时域信号转成频域信号
% [f1,Yf1] = fuliye(f_sig,fs,0);
% figure;plot(f1,Yf1);

4、参考论文
略
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