宽带ISM算法

%宽带信号DOA估计算法：非相干信号子空间（ISM）算法 
% Developed by xiaofei zhang （南京航空航天大学 电子工程系 张小飞）
% EMAIL:zhangxiaofei@nuaa.edu.cn


clc 
clear all 
close all 
M=12;                                      %阵元数 
N=200;                                    %快拍数 
ts=0.01;                                  %时域采样间隔 
f0=100;                                   %入射信号中心频率  
f1=80;                                    %入射信号最低频率 
f2=120;                                   %入射信号最高频率 
c=1500;                                   %声速 
lambda=c/f0;                              %波长 
d=lambda/2;                               %阵元间距 
SNR=15;                                   %信噪比 
b=pi/180;   
theat1=30*b;                               %入射信号波束角1 
theat2=0*b;                                %入射信号波束角2 
n=ts:ts:N*ts;                             
theat=[theat1 theat2]‘; 
 
%%%%%%%%%%%%%%%% produce signal %%%%%%%%%%%%%%%% 
 
s1=chirp（n801120）;                     %生成线性调频信号1； 
sa=fft（s12048）;