资源简介
根据一个图像数据矩阵数据模拟面目标的SAR原始回波信号,然后通过成像算法实现成像
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=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=2; %number of targets
%format [x y reflectivity]
Ptarget=[XminYc1 %position of targets
XminYc+10*DY1
Xmin+20*DXYc+50*DY1];
disp(‘Parameters:‘)
disp(‘Sampling Rate in fast-time domain‘);disp(Fsr/Br)
disp(‘Sampling Number in fast-time domain‘);disp(Nfast)
disp(‘Sampling Rate in slow-time domain‘);disp(PRF/Ba)
disp(‘Sampling Number in slow-time domain‘);disp(Nslow)
disp(‘R
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 5748 2010-01-27 09:16 rawdata\dian.m
文件 78 2010-01-31 20:05 rawdata\ftx.m
文件 79 2010-01-31 20:05 rawdata\fty.m
文件 3593 2010-01-28 11:03 rawdata\fwxz.m
文件 3477 2010-01-31 20:42 rawdata\hh.m
文件 81 2010-01-31 20:05 rawdata\iftx.m
文件 84 2010-01-31 20:05 rawdata\ifty.m
文件 3915 2010-01-28 10:44 rawdata\jlxz.m
文件 14194 2010-01-27 15:20 rawdata\mian\1.jpg
文件 24462 2010-01-27 15:27 rawdata\mian\2.jpg
文件 112202 2010-01-27 15:27 rawdata\mian\3.jpg
文件 122494 2010-01-27 15:28 rawdata\mian\4.jpg
文件 45993 2010-01-27 16:30 rawdata\mian\5.jpg
文件 78 2010-01-13 15:25 rawdata\mian\ftx.m
文件 79 2010-01-13 15:25 rawdata\mian\fty.m
文件 81 2010-01-13 15:25 rawdata\mian\iftx.m
文件 84 2010-01-13 15:25 rawdata\mian\ifty.m
文件 6012 2010-01-27 10:21 rawdata\mian\mian.m
文件 452 2010-01-30 19:10 rawdata\mian\RCSmat.m
文件 276084 2010-01-28 12:03 rawdata\mian\新建 Microsoft Office Word 文档.docx
文件 14146 2010-01-27 15:23 rawdata\mian\旋转 1.jpg
文件 45772 2010-01-27 16:30 rawdata\mian\旋转 5.jpg
文件 78 2010-01-13 15:25 rawdata\mian1\ftx.m
文件 79 2010-01-13 15:25 rawdata\mian1\fty.m
文件 81 2010-01-13 15:25 rawdata\mian1\iftx.m
文件 84 2010-01-13 15:25 rawdata\mian1\ifty.m
文件 4511 2010-01-30 19:10 rawdata\mian1\mian1.m
文件 462 2010-01-30 19:09 rawdata\mian1\RCSmat.m
文件 12853 2010-01-28 16:38 rawdata\mian1\unti
文件 12739 2010-01-28 16:40 rawdata\mian1\旋转 unti
............此处省略60个文件信息
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