How to tackle the given issue?

3 次查看（过去 30 天）
Sadiq Akbar
Sadiq Akbar 2023-8-10
评论： Sadiq Akbar 2023-8-12
I copied the given code from the following Mathworks site: https://www.mathworks.com/help/phased/ref/phased.rootmusicestimator.step.html
clear all;clc
u=[10 4; 45 -2];%u=[Azimuth1 Elevation1; Azimuth2 Elevation2];
% u=[10 4; 45 -2; 65 -8];% 3 Sources
% u=[10 4; 45 -2; 65 -8; 80 0];% 4 Sources
dim=length(u);
M=15;% No. of Antenna Elements
r=1.5;% Radius of UCA
fs = 8000;% Sample rate
fc = 150e6;% Operating frequency
t = (0:1/fs:1).';
x1 = cos(2*pi*t*500);% 1st baseband signal
x2 = cos(2*pi*t*600);% 2nd baseband signal
% x3 = cos(2*pi*t*700);% 3rd baseband signal
% x4 = cos(2*pi*t*800);% 4th baseband signal
%sUCA = phased.UCA('NumElements',M,'Radius',r);% Create UCA Array
sUCA = phased.UCA('NumElements',M,'Radius',r);% Create UCA Array
%x = collectPlaneWave(sUCA,[x1 x2],u',fc);% Plane wave signals
x = collectPlaneWave(sUCA,[x1 x2],u',fc);
% x = collectPlaneWave(sUCA,[x1 x2 x3],u',fc);% Plane wave signals
% x = collectPlaneWave(sUCA,[x1 x2 x3 x4],u',fc);% Plane wave signals
%%%%%%%%%%%%%%%%%%%%%%%%%%%%55
% Add random complex Gaussian white noise to the signals.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
rs = RandStream('mt19937ar','Seed',0);
noise = 0.1/sqrt(2)*(randn(rs,size(x))+1i*randn(rs,size(x)));
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
% Create the phased.RootMUSICEstimator System object™.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
sDOA = phased.RootMUSICEstimator('SensorArray',sUCA,'OperatingFrequency',fc,...
'NumSignalsSource','Property',...
'NumSignals',2);%----------------------- (1)-Two signals
% sDOA = phased.RootMUSICEstimator('SensorArray',sUCA,'OperatingFrequency',fc,...
% 'NumSignalsSource','Property',...
% 'NumSignals',3);%---------------------- (2)-Three signals
% sDOA = phased.RootMUSICEstimator('SensorArray',sUCA,'OperatingFrequency',fc,...
% 'NumSignalsSource','Property',...
% 'NumSignals',4);%---------------------- (3)-Four signals
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
% Solve for the azimuth angles for zero degrees elevation.
%%%%%%%%%%%%%%%%%%%%%%%%%%%
elang = 0;
doas = step(sDOA, x + noise, elang);
az = sort(doas)
%%%%%%%%%%%%%%%%%%%%
% Swapping vector b
%%%%%%%%%%%%%%%%%%%%
% [~, ix] = sort(u); % u is my desired vector
% [~, ix1(ix)] = sort(doas);
% Estimated = doas(ix1);
When I run this code for two signlas, it gives me about correct result i.e., the azimuth angles are estimated correctly in variable az.
Likewise, when I run it for 3 signals, it gives me about the correct result only when I keep the 3rd Elevation angle at -8 in vector u. But when I change its value to say for example -50, then the 3rd angle is estimated wrongly. Why is it so?
Further, when I run it for the four signlas and I keep the 4th Elevation angle at 0 in vector u, then it estimates about the correct results but when I change its value to say for example +40 or -50 etc., it estimates the wrong result. Why is it so also?
  6 个评论
显示 4更早的评论
Torsten
Torsten 2023-8-11
编辑：Torsten 2023-8-11
The code seems to be created by the MATLAB staff.
So use the button "Creare Service Request" under
https://uk.mathworks.com/support/contact_us.html?s_tid=hc_trail
and ask your question.
Sadiq Akbar
Sadiq Akbar 2023-8-12
Thank you very much dear Torsten for your kind guidance. I visited the given link. Then I clicked the button "Creare Service Request" . With this, a new page was opend like this(see attachments 1). Next I don't understand what to do because there is no option like "Ask question"? So can you guide me further what to do and how to do it?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Beamforming and Direction of Arrival Estimation 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by