How to estimate DOA of acoustic signals correctly with phased.MVDREstimator2D?

Hello, I am trying to simulate a microphone array with the Phased Array System Toolbox. I followed the example described in the document of MVDREstimator2D with default values and my own array ,and it worked well. But when I change the property 'PropagationSpeed' to 343m/s, it can no longer caluculate the azimuth and elevation angle of the signal.

microphone = phased.OmnidirectionalMicrophoneElement;
array = phased.URA('Size',[5 10],'ElementSpacing',[0.02 0.01],'Element',microphone);
viewArray(array);                                                       
hold on;

fs = 20000;
t = (0:1/fs:1).';                           
x1 = cos(2*pi*t*300);
x2 = cos(2*pi*t*400);
c_sound = 343;                                                                    
arg = [-37 20];                                       
x_receivedwaves = collectPlaneWave(array,x1,arg',c_sound); 
noise = 0.1*(randn(size(x_receivedwaves))+1i*randn(size(x_receivedwaves)));

estimator = phased.MVDREstimator2D('SensorArray',array,...
    'DOAOutputPort',true,'NumSignals',1,'PropagationSpeed',c_sound, ...
    'AzimuthScanAngles',-50:50,...
    'ElevationScanAngles',-30:30); 

[~,doas] = estimator(x_receivedwaves + noise); 
figure;
plotSpectrum(estimator);

[George]

It looks like you are using propagation speed for the 4th argument in plane wave - propogation speed should be the 5th argument. The 4th argument should be carrier frequency.

This brings up another point - the concept of 'carrier frequency' implies the narrowband assumption - i.e. the modulating waveform is much lower frequency than the carrier waveform, which may not apply in the case of sound waves. I recommend looking at the use of the WidebandCollector for acoustic use cases in the following example:

https://www.mathworks.com/help/phased/ug/acoustic-beamforming-using-a-microphone-array.html

I would recommend trying to see if your MVDR estimator works if you use the WidebandCollector to collect the received waveform.

[隐]

Thank you for your help！Now the estimator can calculate the angles correctly. It also got better result after applying the WidebandCollector.