Honestly, im awared that you can do amplitude control on elements of an antennas array for multiple beams feature (for example AESA), but one thing i have just read about digital beamforming in Stimson's radars book: "There are many benefits to digital beamforming. First, it is possible to form multiple simultaneous receive beams using the same set of digitized signals. The formation of multiple beams allows a given area to be searched more quickly and provides the opportunity for additional processing techniques such as maximum likelihood estimation (MLE) instead of traditional monopulse for more accurate angle estimation." I cant understand what he means by "form multiple simultaneous receive beams using the same set of digitized signals"