【雷达图像】SAR合成孔径雷达成像及处理含Matlab源码

clear all; %====================================================================== %%% (I) parameters’ definition %====================================================================== c=3e+8; % speed of light pi=3.1415926; % pi j00=sqrt(-1); % square root of -1 res_a=2; % required azimuth resolution res_r=2; % 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=3.e+9; % carrier frequency FsFactor = 1.0; theta=90*pi/180; % squint angle %====================================================================== lamda=c/fc; % wavelength Br=k_r*c/2./res_r; % required transmitted bandwidth Fs=Br*FsFactor; % A/D sampling rate bin_r=c/2./Fs; % range bin Kr=Br/Tp; % range chirp rate La=Ra*k_a*lamda/2/res_a; % required synthetic aperture length Ta=La/va; % required synthetic aperture time fdc=2*va*cos(theta)/lamda; % doppler centriod fdr=-2*(va*sin(theta)).^2/lamda/Ra; % doppler rate Bd=abs(fdr)*Ta; % doppler bandwidth prf=round(Bd*2); % 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-Ra*cos(theta); % azimuth location along flight track Na=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 point Npt_num = length(x0); ra=zeros(Npt_num, length(xa)); % calculate every point target’s slant range history for i=1:Npt_num ra(i,:)=sqrt((Ra*sin(theta)+R0(i)).^2+(xa+x0(i)).^2); end rmax=max(max(ra)); % max. slant range rmin=min(min(ra)); % min. slant range rmc=fix((rmax-rmin)/bin_r); % range migration, number rg=0*ra; % initialize rg=fix((ra-rmin)/bin_r+1); % range gate index caused by range migration rgmax=max(max(rg)); rgmin=min(min(rg)); nr=round(Tp*Fs); % samples of a pluse tr=1:fix(nr)+1; tr=tr/Fs-Tp/2; % fast time within a pluse duration Nr=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 end sig_real=real(sig); colormap(gray); contour(sig_real); 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