【雷达图像】SAR合成孔径雷达成像及处理含Matlab源码

 1 简介

该文介绍了自己在硕士研究生期间围绕SAR(合成孔径雷达)展开的研究工作.除了背景介绍外,具体包括了高分辨率雷达图像的模拟,植被生物量与雷达后向散射系数的反演曲线,SAR图像地表分数维信息和分辨率提高,用合成孔径雷达图像反演浅海水下地形以及雷达卫星SAR与防卫气象卫生SSM/I对渤海海冰的观测研究等五方面的研究工作.所有工作主要致力于SAR图像信息的模拟,处理及应用研究等领域.

2 部分代码

clear all;%======================================================================%%% (I) parameters' definition%======================================================================c=3e+8; % speed of lightpi=3.1415926; % pij00=sqrt(-1); % square root of -1res_a=2; % required azimuth resolutionres_r=2; % required range resolutionk_a=1.2; % azimuth factork_r=1.2; % range factorRa=4000.; % radar working distanceva=70.; % radar/platform forward velocityTp=1.e-6; % transmitted pulse width fc=3.e+9; % carrier frequency FsFactor = 1.0;theta=90*pi/180; % squint angle %======================================================================lamda=c/fc; % wavelengthBr=k_r*c/2./res_r; % required transmitted bandwidthFs=Br*FsFactor; % A/D sampling ratebin_r=c/2./Fs; % range binKr=Br/Tp; % range chirp rate La=Ra*k_a*lamda/2/res_a; % required synthetic aperture lengthTa=La/va; % required synthetic aperture timefdc=2*va*cos(theta)/lamda; % doppler centriodfdr=-2*(va*sin(theta)).^2/lamda/Ra; % doppler rateBd=abs(fdr)*Ta; % doppler bandwidthprf=round(Bd*2); % PRF %======================================================================%%%(II) echo return modelling (point target)%======================================================================na=fix(Ta*prf/2); % azimuth sampling numberta=-na:na; ta=ta/prf; % slow time along azimuthxa=va*ta-Ra*cos(theta); % azimuth location along flight trackNa=2*fix(na);%x0=[ 0 0 0 0 0 ]; % define multi points if you want%R0=[-20 -10 0 10 20 ]; % x0: azimuth location (positive towards forward velocity) % R0: slant range location (positive towards far range)x0=[ 0 0 ]; R0=[ 0 10 ]; % only one pointNpt_num = length(x0);ra=zeros(Npt_num, length(xa)); % calculate every point target's slant range historyfor i=1:Npt_num ra(i,:)=sqrt((Ra*sin(theta)+R0(i)).^2+(xa+x0(i)).^2); end rmax=max(max(ra)); % max. slant rangermin=min(min(ra)); % min. slant rangermc=fix((rmax-rmin)/bin_r); % range migration, numberrg=0*ra; % initialize rg=fix((ra-rmin)/bin_r+1); % range gate index caused by range migrationrgmax=max(max(rg));rgmin=min(min(rg));nr=round(Tp*Fs); % samples of a plusetr=1:fix(nr)+1; tr=tr/Fs-Tp/2; % fast time within a pluse durationNr=nr+rgmax;%======================================================================%%%(II) echo return modelling (point target)%======================================================================sig=zeros(Na,Nr); for i=1:Na for k=1:Npt_num sig(i,rg(k,i):rg(k,i)+nr)=sig(i,rg(k,i):rg(k,i)+nr)+exp(-j00*4*pi/lamda*ra(k,i))*exp(-j00*pi*Kr*(tr).^2); end endsig_real=real(sig);colormap(gray); 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3 仿真结果

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编辑

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编辑

4 参考文献

[1]张巍. 合成孔径雷达SAR图像信息的模拟,处理及应用[D]. 复旦大学, 2001.

博主简介：擅长智能优化算法、神经网络预测、信号处理、元胞自动机、图像处理、路径规划、无人机等多种领域的Matlab仿真，相关matlab代码问题可私信交流。