I have been learning about radar technologies for a while, with the intent of building one for fun. When looking at Phased Array radars, there is plenty of information on the beamforming math and cool animations showing the wavefront. But there seems to be little information on what goes on in the other parts of the system (see below). For instance how is the data interpreted? How is the signal received?
I was thinking that you can just hold the phase shifters constant and have the return signal just travel back through the rf chain to a circulator to split off the rx. (Are phase shifters in the real world bi-directional?)
I was looking at some kind of Frequency-Modulated Continuous-Wave setup because it cam be realized pretty cheaply with fairly low bandwidth ADC requirements but I am unsure if this can be applied to Phased Array Radar, or if there are even better techniques out there.