SAR雷达回波仿真matlab

%% LFCW-SAR正侧视回波信号
clear;clc;close all;
%% 基本参数
c=3e8;                                      %光速
fstart=2260e6;                              %起始频率
fstop=2590e6;                               %终止频率
fc=（fstart+fstop）/2;                        %载频
lambda=c/fc;                                %波长
Br=fstop-fstart;                            %发射信号带宽
Tr=20e-3;                                   %信号持续时间
K=Br/Tr;                                    %调频率
s=16.8;                                       %雷达平台到场景平面的垂直距离
theta_L=0/180*pi;                          %波束俯仰角%%%%%%%
Rs=s/cos（theta_L）;                          %景中心斜距
Yc=sqrt（Rs^2-s^2）;                          %场景中心位置（距离方向）
Y0=5;                                       %场景宽度一半
Ymax=Yc+Y0;                                 %距离方向上的最大值
Ymin=Yc-Y0;                                 %距离方向上的最小值%%%%
Xmin=-5;                                    %方位向成像最小距离
Xmax=5;                                     %方位向成像最大距离
D=0.1;                                      %天线尺寸
Lsar=0.886*Rs*lambda/D;                     %合成孔径长度
l=2.4;                                      %%%%%
Rmin=sqrt（Ymin^2+s^2）;                      %最短斜距
Rmax=sqrt（Ymax^2+s^2+（Lsar）^2）;             %最长斜距
% Rmax=sqrt（Ymax^2+s^2+（l/2）^2）;
DY=c/2/Br;                                  %距离向理论分辨率
DX=D/2*Lsar/l;                                     %方位向理论分辨率
%% 点目标信息
 PY=[3 3 3 0 0 0 -3 -3 -