Due to the progress made in the development of hardware and, above all, software in recent decades, the performance of passive radar systems today corresponds in many respects to that of conventional radars for air and sea surveillance. In terms of their effectiveness against stealth aircraft, they are even believed to have special performance. Nevertheless, demand for such systems appears to be rather low so far.
Passive radar refers to a class of radar systems that can locate and track objects by processing reflections of signals from the receiver from remote, non-cooperative transmitters. The location and technical characteristics of the non-cooperative transmitters must be known as precisely as possible. They are a special case of bistatic radar systems, which use signals from cooperative transmitters belonging to the system to simplify the relationship between transmitter and receiver. Systems that do not process the signals reflected by target objects, but directly emitted by systems on board the target systems (radar, communication, navigation, etc.), are sometimes also referred to as passive radars, but are, strictly speaking, sensors for electronic reconnaissance.
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