This is a very good point to start: https://www.rtl-sdr.com/tag/passive-radar/ https://www.rtl-sdr.com/tag/passive-radar/ If you have more than one receiver, t

This is a very good point to start: https://www.rtl-sdr.com/tag/passive-radar/ https://www.rtl-sdr.com/tag/passive-radar/ If you have more than one receiver, the main issue is time sincronisation between the receivers. Using the two transmitters will complicate things a lot