I've been reading up a bunch on radar and most applications exploit the long range capabilities (rightfully so), but I'm wondering what is the smallest range a radar system can operate at?
I'm interested in synthetic aperture radar on small scales. Specifically, I would like to measure the ocean waves over a 5m radius (yes 5m, not 5km) and build a "depth map" showing the "instantaneous" wave heights and surface currents (maximum frequency is 10Hz). I know this is done from space satellites, so why can't it be done from a pier or drone?
I'm not a radar person, so excuse my ignorance, but doesn't the concept of radar scale? I would imagine you can build a miniature antenna array that scales to the range of interest? So if my range of interest is 0-100m (yes meters), couldn't the antenna be as simple as a wifi antenna?