I understand delay and sum beamforming, where we want to add the signals obtained from different sensors. But adding different time samples from different element of the array depending on the angle we are interested. For broadside or zero degree we would add the samples from the same time instant from each element of the array. On the other hand if we are interested to beamform in a particular angle there would be time delay between the samples of each element.
The question where "Fourier beamforming" comes into this picture? I have seen this term in many places. Any comment would be appreciated.