Kuschel, H.H.KuschelHeckenbach, J.J.HeckenbachO'Hagan, D.D.O'HaganUmmenhofer, M.M.Ummenhofer2022-03-112022-03-112011https://publica.fraunhofer.de/handle/publica/37438110.1109/MRRS.2011.6053653Passive 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.en621conference paper