Bridging the gap between civilian and military passive radar

Passive coherent location (PCL), passive covert radar (PCR), passive bistatic radar (PBR), passive radar, parasitic radar, and hitchhiking radar are all common names for passive radar systems exploiting cooperative, noncooperative transmitters, or transmitters of opportunity, [1, pp. 3]. Recent review of the various names resulted in the compromise PBR, [2, pp. 248]. However, it should be noted that the PCL name is still being used for full systems like Lockheed Martin's - Silent Sentry [3], [4], Thales' - Homeland alerter 100 [5], [6] seen in Figure 1, and Airbus “Passive Radar” [7]-[15]. The PCL systems may be considered as systems of PBR systems. This work focuses on the system perspective of the technology, i.e. PCL, while relying on the technical depths of the PBR technology.