matlab-(含教程)基于LFM的雷达信号脉冲响应分析,并分析不同速度下的多普勒效应

clc; clear; close all; warning off; addpath(genpath(pwd)); load('Data.mat') figure; plot(1:1000,(Radar.LFM))%LFM before pulse compression title('Linear FM waveform ') xlabel('Time (s)') ylabel('Amplitude') %Matched filtering C=conj(Radar.LFM); %Matched filter from LFM for i=1:256 D(i,:)=conv(Radar_Data(i,:),(fliplr(C))); %Applying Matched filter in fast time end D=D(:,(999:1:9998)); figure; plot(10*log10((abs(D(10,:))))) %matched filter single pulse title('Single pulse Matched filter') xlabel('Range (m)') ylabel('Signal Power (dB)') %doppler processing H=hamming(256); %Windowing figure; plot(H) title('Hamming Window: Time Domain') xlabel('Samples') ylabel('Amplitude') PRF=1/Radar.PRI; for j=1:9000 X(:,j)=D(:,j).*H; Data(:,j)=fftshift(fft(X(:,j))); end figure; mesh(20*log10(abs(Data))) title('Range/Doppler response') xlabel('Range Bins') ylabel('Frequency Bins') zlabel('Signal power dB') %velocity V_min=(-PRF/2)*Radar.lambda; V_max=(PRF/2)*Radar.lambda; Velocity=V_min:(V_max-V_min)/255:V_max; figure; plot(Velocity,20*log10(abs(Data(:,700)))) title('Doppler response of max. target') xlabel('Velocity (m/s)') ylabel('Magnitude') %Range c=3e8; R_min=c*Radar.Pulse_Width/2; R_max=c*Radar.PRI/2; Range=R_min:(R_max-R_min)/8999:R_max; figure; plot(Range,20*log10(abs(Data(157,:)))) title('Range response of max. target') xlabel('Range (m)') ylabel('Magnitude') %Surface plot figure; mesh(Range,Velocity,20*log10(abs(Data))) title('Range/Doppler Response') xlabel('Range (m)') ylabel('Velocity (m/s)') zlabel('Signal power (dB)')