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Passive Radar systems employing different types of donors provide varying performance capabilities due to the illuminator signal properties and transmitter characteristics. Here, a hybrid, multi-frequency Passive Radar concept is proposed based on real world experiences with experimental systems, which join the advantageous properties of the components for optimum performance

The potential of passive, multi-static radars as covert sensors for the detection of low flying, stealth air targets are illustrated by multi-static RCS analysis, coverage simulations for low flight levels and measurement results obtained with an experimental passive radar using digital audio broadcast signals (DAB). The measurement sensor is described and future perspectives are pointed out

The history of passive radar dates back to the early days of radar in 1935 when the Daventry experiment was conducted in the UK. It continues in WW II with the German Klein Heidelberg passive radar and receives new interest today, as passive covert radar (PCR) systems like Silent Sentry, Homeland Alerter 100, Aulos and PARADE are ready for operation. The future of PCR will strongly depend on the availability of transmitters of opportunity such as FM-radio and digital broadcast networks