资源简介
SAR运动目标回波模拟以及对回波数据成像的仿真
代码片段和文件信息
%%========================================================
clear;clc;close all;
%%========================================================
%%Parameter--constant
C=3e8; %propagation speed
%%Parameter--radar characteristics
Fc=1e9; %carrier frequency 1GHz
lambda=C/Fc; %wavelength
%%Parameter--target area
Xmin=0; %target area in azimuth is within[XminXmax]
Xmax=50;
Yc=10000; %center of imaged area
Y0=500; %target area in range is within[Yc-Y0Yc+Y0]
%imaged width 2*Y0
%%Parameter--orbital information
V=100; %SAR velosity 100 m/s
H=5000; %height 5000 m
R0=sqrt(Yc^2+H^2);
%%Parameter--antenna
D=4; %antenna length in azimuth direction
Lsar=lambda*R0/D; %SAR integration length
Tsar=Lsar/V; %SAR integration time
%%Parameter--slow-time domain
Ka=-2*V^2/lambda/R0; %doppler frequency modulation rate
Ba=abs(Ka*Tsar); %doppler frequency modulation bandwidth
PRF=2*Ba; %pulse repitition frequency
PRT=1/PRF; %pulse repitition time
ds=PRT; %sample spacing in slow-time domain
Nslow=ceil((Xmax-Xmin+Lsar)/V/ds); %sample number in slow-time domain
% Nslow=2^nextpow2(Nslow); %for fft
sn=linspace((Xmin-Lsar/2)/V(Xmax+Lsar/2)/VNslow);%discrete time array in slow-time domain
PRT=(Xmax-Xmin+Lsar)/V/Nslow; %refresh
PRF=1/PRT;
ds=PRT;
%%Parameter--fast-time domain
Tr=5e-6; %pulse duration 10us
Br=30e6; %chirp frequency modulation bandwidth 30MHz
Kr=Br/Tr; %chirp slope
Fsr=3*Br; %sampling frequency in fast-time domain
dt=1/Fsr; %sample spacing in fast-time domain
Rmin=sqrt((Yc-Y0)^2+H^2);
Rmax=sqrt((Yc+Y0)^2+H^2+(Lsar/2)^2);
Nfast=ceil(2*(Rmax-Rmin)/C/dt+Tr/dt);%sample number in fast-time domain
% Nfast=2^nextpow2(Nfast); %for fft
tm=linspace(2*Rmin/C2*Rmax/C+TrNfast); %discrete time array in fast-time domain
dt=(2*Rmax/C+Tr-2*Rmin/C)/Nfast; %refresh
Fsr=1/dt;
%%Parameter--resolution
DY=C/2/Br; %range resolution
DX=D/2; %cross-range resolution
%%Parameter--point targets
Ntarget=1; %number of targets
%format [x y reflectivity]
Ptarget=[XminYc1
XminYc+10*DY1
Xmin+20*DXYc+50*DY1];
disp(‘参数:‘)
disp(‘Sampling Rate in fast-time domain‘);disp(Fsr/Br)
disp(‘快时间域采样点数‘);disp(Nfast)
disp(‘Sampling Rate in slow-time domain‘);disp(PRF/Ba)
disp(‘慢时间域采样点数‘);disp(Nslow)
disp(‘距离分辨率‘);disp(DY)
disp(‘方位分辨率‘);disp(DX)
disp(‘合成孔径长度‘);disp(Lsar)
disp(‘目标位置【(0-5
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 4856 2010-03-13 07:53 movingtarget\dian.m
文件 696 2010-03-14 19:35 movingtarget\dianmian.m
文件 203 2010-03-13 09:51 movingtarget\dmstap.m
文件 78 2010-03-08 09:44 movingtarget\ftx.m
文件 79 2010-03-08 09:44 movingtarget\fty.m
文件 81 2010-03-08 09:44 movingtarget\iftx.m
文件 84 2010-03-08 09:44 movingtarget\ifty.m
文件 5685 2010-03-14 19:30 movingtarget\jdian.m
文件 5558 2010-03-13 08:00 movingtarget\mdian.m
文件 5643 2010-03-14 19:35 movingtarget\mdian1.m
文件 3686 2010-03-14 19:03 movingtarget\mmian.m
文件 5224 2010-06-14 21:37 movingtarget\tdian.m
目录 0 2012-10-03 18:49 movingtarget
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