A passive radar system is inherently multi-static ... making it possible to perform these types of measurements with easily obtainable hardware. The Manastash Ridge radar used FM radio for ...

Unlike active radar systems which use a specific radio source ... of the system which can even recognize helicopters from other types of aircraft, and also uses the ADS-B monitoring system as ...

The Robin Radar System has been floated by American officials to try to uncover the mystery of unidentified flying objects seen hovering over New Jersey, New York and surrounding areas.