This repository contains processing code for a software defined radio based passive radar. Passive radars don't transmit any signals of their own - instead, they locate targets by detecting the echoes of ambient radio signals that bounce off of them. Uses FM radio broadcasts as the illuminating signal. This is not realtime - it analyzes stored PR information and displays it, and it's not quick. It does tell you how to collect your own radar data, however, as well as which SDRs are feasible.