We basically make doppler radars - here frequency-shift is proportional to the speed of the object. Most other radars (pulse-radars) uses the bandwidth of a pulse to gain range resolution (the wider the bandwidth the better the res).

Here's a few (very old) plots of how our radars see the world through a spectrogram: https://weibelradars.com/space/space-industry/

What would be cool, would be a browser-based way to do soft analysis of these plots.

Radar signals are modulated in very specific ways, which are visible right away even with plenty of noise on a spectrogram. Classifying the modulation of radar signals is something common in military contexts, since it allows you to listen for emissions and be able to tell if it's an enemy or an ally. I bet it has more uses than that, but it's the first one I could think of.