SAR点目标成像仿真，包括回波信号模型的建立，非常完整，没有BUG

close all; clear all; clc;

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%                                      三点目标（ABC）小斜视角下的机载雷达仿真
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Rc=2e4; %景中心斜距
Vr=150; %雷达有效速度
Tr=2.5e-6; %发射脉冲时宽 
Kr=20e12; %距离调频率
f0=5.3e9; %雷达工作频率
deltaF=80; %多普勒带宽
Fr=6e7; %距离向采样率
Fa=100; %方位向采样率
Na=256; %距离线数
Nr=320; %距离线采样点数
thetaC=3.5*pi/180; %波速中心斜视角
R0=Rc*cos（thetaC）; %最短斜距
etaC=-Rc*sin（thetaC）/Vr; %波束中心偏移时间
c=3e8; %光速 
lamda=c/f0; %波长
fc=2*Vr*sin（thetaC）/lamda; %多普勒中心频率
betaBW=deltaF*lamda/（2*Vr*cos（thetaC））; %方位向波束宽度
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tau=linspace（2*Rc/c-0.5*Nr/Fr2*Rc/c+0.5*Nr/Fr-1/FrNr）; %距离时间   等间距一维数组  个数为Nr-1 
ftau=linspace（-Fr/2Fr/2-Fr/NrNr）; %距离频率
eta=linspace（-0.5*Na/Fa0.5*Na/Fa-1/FaNa）; %方位时间  坐