Looks like, you are working to simulate a geolocation scenerio with a single scanning radar emitter and an array of four receivers. And you are looking for a setup and examples related to the the same in MATLAB.
I looked and found a basic example of how to use the 'musicdoa' function in MATLAB for direction of arrival(DOA) estimation.
Check the following reference link about 'musicdoa' function:
Here is an example code from the documentation:
% Specify the number of ULA elements and the element spacing (in wavelengths)
nelem = 11;
d = 0.5;
snr = 5.0;
elementPos = (0:nelem-1)*d;
% Specify the number of signals and their broadside arrival angles
nsig = 3;
angles = [0.0 -12.0 85.0];
% Create the sensor covariance matrix
covmat = sensorcov(elementPos, angles, db2pow(-snr));
% Estimate the broadside arrival angles
doas = musicdoa(covmat, nsig);
In this example, 'nelem' is the number of elements in the ULA, 'd' is the spacing between the elements, 'snr' is the signal-to-noise ratio, 'elementPos' is the position of the elements, 'nsig' is the number of signals, and 'angles' are the arrival angles of the signals. The 'sensorcov' function is used to create the sensor covariance matrix, and the 'musicdoa' function is used to estimate the directions of arrival (DOAs).
Here is a example related to 'Direction to Arrival Estiamation with Beamscan, MVDR and MUSIC':
Hope it helps.
