I understand how (one of the) principle(s) of RADAR works: send a signal, record the received scattering copy off the target, and measure the elapsing time. You might need to consider Doppler effects, but let's not worry about this. But this signal only gives you a topography of a single point. How can an analog RADAR obtain a topography map (per pulse) that has finite 2D area?
I know the pulse spreads spherically as it propagates, and so is the scattering copy, but still the antenna will receive one signal -- how can it tell which is which?
EDIT: To be more specific: Suppose your radar is in an airplane and directed downwards. It sends a pulse. On ground, there are two objects -cars, for instance- separated by distance x, and each of diameter d. When the pulse reflects off the two cars and reach the RADAR, how is the x and y axis differentiated? I'd assume the antenna lump sums everything into one energy pulse, thus losing all spatial details. This should not be an issue, however, in case of one object only.