clear all;
%%% parameters' definition
c=3e+8; % speed of light
pi=3.1415926;
j=sqrt(-1);
Tp=1.e-6; % transmitted pulse width
fc=1.e+9; % carrier frequency
Br=50.e+6; % transmitted bandwidth
Fs=200.e+6; % A/D sample rate
kr=Br/Tp; % range chirp rate
Nr=Tp*Fs;
Ni=1:Nr;
tr=(Ni-Nr/2)*Tp/Nr;
lamda=c/fc;
%===============================
%Chirp pulse echo from point A
%===============================
sig_point0 = exp(j*pi*kr*(tr).^2);
%===============================
%Chirp pulse echo from point B
%===============================
dr=3.5; dr_t=2*dr/c; dN=dr_t*Fs;
%sig_point1 = exp(j*pi*kr*(tr-dr_t).^2);
sig_point1 = exp(j*pi*kr*(tr-0*dr_t).^2+j*2*pi*2*dr/lamda);
Nx=fix(3*Nr);
sig_0 = zeros(1, Nx);
sig_1 = zeros(1, Nx);
sig_0(Nr+1:2*Nr)=sig_point0;
sig_1(Nr+dN+1:2*Nr+dN)=sig_point1;
%===============================
% Summary echo signal of A and B
%===============================
sum_sig = sig_0 + sig_1;
figure;
subplot(4,1,1); plot(real(sig_0));
subplot(4,1,2); plot(real(sig_1));
subplot(4,1,3); plot(real(sum_sig));
%=====================================
% Range compression with match filter
%=====================================
mf_sig = conj(fliplr(sig_point0));
mf_out = conv(sum_sig, mf_sig);
Ns=Nr/2+1; Ne=3*Nr+Nr/2;
subplot(4,1,4); plot(abs(mf_out(Ns:Ne)));
range_compress.zip_SAR 调频_range_range_compress
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