资源简介
合成孔径雷达点目标 RD成像算法 MATLAB 源码,可读性强,适合新手学习。
代码片段和文件信息
clear all;
%%%(I) parameters‘ definition
c=3e+8; % speed of light
pi=3.1415926 % pi
j00=sqrt(-1); % square root of -1
res_a=1; % required azimuth resolution
res_r=1; % required range resolution
k_a=1.2; % azimuth factor
k_r=1.2; % range factor
Ra=4000.; % radar working distance
va=70.; % radar/platform forward velocity
Tp=1.e-6; % transmitted pulse width
fc=1.e+9; % carrier frequency
FsFactor = 1.0
lamda=c/fc; % wavelength
B=k_r*c/2./res_r; % required transmitted bandwidth
Fs=B*FsFactor; % A/D sampling rate
bin_r=c/2./Fs; % range bin
gama=B/Tp; % range chirp rate
delta_theta=k_a*lamda/2/res_a; % required azimuth opening angle
% corresponding to processed bandwith
% (should be less than azimuth 3dB opening angle)
La=Ra*delta_theta; % required synthetic aperture
Ta=La/va; % required synthetic aperture time
thetas_c=pi/2; % zero squint
fdc=2*va*cos(thetas_c)/lamda; % doppler centriod
fdr=-2*va*va*sin(thetas_c)^2/lamda/Ra; % doppler rate
Bd=abs(fdr)*Ta; % doppler bandwidth
prf=100.; % PRF
%%%(II) echo return modelling(point target)
na=fix(Ta*prf/2); % azimuth sampling number
ta=-na:na;
ta=ta/prf; % slow time along azimuth
xa=va*ta; % azimuth location along flight track
na=2*fix(na);
%x0=[0 0 0 0 0 0 -60 -30 30 60];
%R0=[-10 0 10 20 30 40 0 0 0 0]; %%%%%%% more than one point target
x0=[0 ];
R0=[0 ];
Npt_num = length(x0);
% single point target‘s azimuth location
% positive towards forward velocity
% single point target‘s slant range location
ra=zeros(Npt_num length(xa)); % positive towards far range
for i=1:Npt_num
ra(i:)=sqrt((Ra+R0(i)).^2+(xa+x0(i)).^2); % single point target‘s slant range history
end
rmax=max(max(ra)); % max. slant range
rmin=min(min(ra)); % min. slant range
rmc=fix((rmax-rmin)/bin_r); % range migration
rg=0*ra;
rg=fix((ra-rmin)/bin_r+1); % range gate beause of range migration
rgmax=max(max(rg));
rgmin=min(min(rg));
nr=round(Tp*Fs); % min range samples
tr=1:fix(nr)+1;
tr=tr/Fs-Tp/2; % fast time along range
[mNa]=size(ta);
Nr=nr+rgmax;
Na
Nr
sig=zeros(NaNr);
for i=1:Na
for k=1:Npt_num
sig(irg(ki):rg(ki)+nr)=sig(irg(ki):rg(ki)+nr)+exp(-j00*4*pi/lamda*ra(ki))*exp(-j00*pi*gama*(tr).^2);
end
end
disp(‘end of echo return modelling‘)
figure(1)
contour(abs(sig))
%%%===============================================================================
for i=1:Na
sig(i:)=fftshift(fft(sig(i:)));
end
disp(‘end of range fft‘)
dfr=Fs/Nr;
fr=((0:Nr-1)-Nr/2)*dfr;
phase1=exp(-j00*pi*(fr).^2/gama)
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 3951 2005-12-21 19:18 RD.m
----------- --------- ---------- ----- ----
4169 2
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