Tool/software:
Hi there,
I'm trying to do elevation estimation using virtual channel 8 and 12 since there is vertical separation between them. I avoided FFT since the resolution would be poor and therefore I chose to do phase interferometry. As discussed in the TI MIMO processing document, I found the phase difference between channel 8 and channel 12 and then processed to get angles however the results I received are not correct.
function [elevation_map] = elevation_estimation(rdm) % Input is a 3D range doppler map where the first dimension is channels, the second is doppler and third is range.
%Output is a 2D map of angles corresponding to each range doppler bin
rdm_8 = squeeze(rdm(8,:,:));
rdm_12 = squeeze(rdm(12,:,:));
phase_diff = angle(rdm_8) - angle(rdm_12);
wrapped_phase = mod(phase_diff + pi, 2*pi) - pi;
dims = size(wrapped_phase);
elevation_map = zeros(dims(1),dims(2));
for i = 1:dims(1)
for j = 1:dims(2)
elevation_map(i,j) = asin(wrapped_phase(i,j)/pi) * 180/pi;
end
end
end
Can you confirm that my estimation method is correct?
