DIY Doppler Radar - YouTube
Build a Small Radar System Capable of Sensing Range, Doppler, and Synthetic Aperture Radar Imaging | MIT OpenCourseWare
you won't find SAR capability in your average police radar
s-band system using two coffee cans which just happen to be the perfect transmit and receive antenna dimensions for a s - band system.
How about that. Who'd have thought !
MIT free, open course where downloadable project
0ne KM range