经典MUSIC算法MATLAB仿真，带详细注释

% DOA estimation by MUSIC % 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 clear all close all derad = pi/180; % deg -> rad radeg = 180/pi; twpi = 2*pi; kelm = 8; % 阵列数量 dd = 0.5; % space d=0:dd:(kelm-1)*dd; %  iwave = 3; % number of DOA theta = [10 30 60]; % 角度 snr = 10; % input SNR (dB) n = 500; % A=exp(-j*twpi*d.'*sin(theta*derad));%%%% direction matrix S=randn(iwave,n); X=A*S; X1=awgn(X,snr,'measured'); Rxx=X1*X1'/n; InvS=inv(Rxx); %%%% [EV,D]=eig(Rxx);%%%% EVA=diag(D)'; [EVA,I]=sort(EVA); EVA=fliplr(EVA); EV=fliplr(EV(:,I)); % MUSIC for iang = 1:361 angle(iang)=(iang-181)/2; phim=derad*angle(iang); a=exp(-j*twpi*d*sin(phim)).'; L=iwave; En=EV(:,L+1:kelm); SP(iang)=(a'*a)/(a'*En*En'*a); end %  SP=abs(SP); SPmax=max(SP); SP=10*log10(SP/SPmax); h=plot(angle,SP); set(h,'Linewidth',2) xlabel('angle (degree)') ylabel('magnitude (dB)') axis([-90 90 -60 0]) set(gca, 'XTick',[-90:30:90]) grid on