LFM匹配滤波

% demo of LFM pulse radar
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                       参数
% T：chirp信号的持续脉宽
% B：chirp信号的调频带宽
% Rmin：观测目标距雷达的最近位置
% Rmax：观测目标距雷达的最远位置
% R：一维数组，数组值表示每个目标相对雷达的斜距
% RCS：一维数组，数组值表示每个目标的雷达散射截面
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% function LFM_radar（TBRminRmaxRRCS）
% if nargin==0
    T=10e-6;
    B=30e6;
    Rmin=10000;
    Rmax=15000;
    R=[105001100012000120081300013002];
    RCS=[1 1 1 1 1 1];
% end
%                   parameter
c=3e8;
K=B/T;
Rwid=Rmax-Rmin;  % 接收到的 距离窗
Twid=2*Rwid/c;   % 时延
Fs=5*B;          % 采样频率
Ts=1/Fs; 
Nwid=ceil（Twid/Ts）;             % 5000
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 雷达回波
t=linspace（2*Rmin/c2*Rmax/cNwid）;   % t的有效时间范围
M=length（