资源简介
点目标成像程序,对于SAR成像初学者非常有用。里面包含多点目标成像(用RD算法),包含距离徙动矫正,最后结果的评价
代码片段和文件信息
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Project: Simulation.m %%
%% Author: BoBo Li %%
%% Date : September 19th2004 %%
%% Functionality: 模拟产生原始数据
%% 备注 : %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear all; % 清除所有的变量
clc; % 清屏
close all; % 关闭所有的图形窗口
cj = sqrt(-1);
pi2 = 2*pi;
c = 3e8;
%
%% System Parameters
RanNum = 1024;
AziNum = 1024;
PRF = 100;% 脉冲重复频率
Va = 100;% 方位向速度
R0 = 6e3;% 到场景中心的最短距离
%
%% fast time parameters
Klfm = 6e12; % 调频斜率
Tp = 6e-6; % Pulse duration time
BandWidth = Tp*Klfm;
SapRate = 50e6; % 采样率
flag1 = SapRate/BandWidth %采样率必须大于带宽
delta_tr = 1/ SapRate; % 采样间隔
Tr = delta_tr*[0:RanNum-1]; % 快时间
X0 = 1000; % 距离向宽度为2X0
Rmin = R0 - X0; %
Tr_start = 2*Rmin/c;
Tr = Tr_start + Tr;
Range = Tr*c/2;
lambda = 0.3;
fc = c/lambda;
wc = pi2*fc;
wcm = wc - 0.5*Tp*Klfm;
%ptr = exp(cj*wcm+cj*pi*Klfm*Tr.^2).*(Tr>0 & Tr %plot(real(ptr));
%
%% slow time parameters
Fk = -2*Va^2/(lambda*R0); % 多普勒调频斜率
Ts = 6; % 合成孔径时间
DoBandWidth = abs(Fk)*Ts; % Doppler BandWidth
flag2 = PRF/DoBandWidth % flag2 > 1
PRI = 1/PRF;% 脉冲重复间隔
Ta = PRI*[-AziNum/2:AziNum/2-1];
Azimuth = Va*Ta; %方位
L = 0.5*Ts*Va; % 半孔径
%Td = 2*Rt/c;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% SIMULATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 以下使用的是各目标与场景中心的相对距离
ntargets = 1; % 点目标的个数,可以选多个。
TARGETS =zeros(29);
DX = 0.5*c*1/BandWidth;
DY = Va*1/DoBandWidth;
CENTER = [ R0 0 ];
%
%% 点目标的坐标与后向散射系数
TARGETS(:1) = [ 0 0 ].‘; sigma(1)= 1;
TARGETS(:2) = [-50*DX 50*DY].‘; sigma(2)= 2;
TARGETS = TARGETS + CENTER.‘*ones(19);
%
%% Generating the raw data
Sr = zeros(AziNumRanNum);
for i = 1:ntargets
Rt = sqrt(TARGETS(1i).^2+Va^2*(Ta- TARGETS(2i)/Va).^2); % 随慢时间变化的斜距
Rt = Rt.‘;
Td = ones(AziNum1)*Tr - 2*Rt/c*ones(1RanNum);
Sr = Sr + sigma(i)*exp(cj*wcm*Td+cj*0.5*pi2*Klfm*Td.^2).*( abs(Td) end;
Sr=Sr.*(ones(AziNum1)*exp(-cj*wc*Tr)); % 去载频
%
%% visualize the raw data
figure(1);
%G=abs(Sr);
G=abs(real(Sr));
xg=max(max(G));ng=min(min(G));cg=255/(xg-ng);
colormap(gray(256));
image(RangeAzimuth255-cg*(G-ng));
title(‘the raw data‘);
xlabel(‘Range meters‘);
ylabel(‘Azimuth meters‘);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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