Modern military radars are not one emitter/receiver, but arrays of many sets of those, compacted into a small space.

So, you have maybe 16 or 64 or whatever aimable, convergeable, points of measurement as opposed to just one, with which you can get a much more accurate picture of what you are looking at.

The bottom is basically using a whole bunch of complex math to simulate a sound environment that would be created by a more complex 3d scene.

Its… not a perfectly comparable analogy, but what they’re going for is that actually having a whole bunch of fancy sensors is better than having one that uses a bunch of math to interpolate the data from just one sensor.

It’s talking about good and bad radar