The Kraken RF project, which has multiple SDR radios next to each other, had demo code of a passive radar: the slight time delay by which signals arrived at the antennas could be used to detect large metal bodies (IOW: planes) in the sky.
They took down the demo code they were informed that they were violating ITAR regulations.
They took down the demo code they were informed that they were violating ITAR regulations.
https://www.reddit.com/r/RTLSDR/comments/yu9rei/krakenrf_pul...