A radar detector warns its user when it detects
a radar signal. A radar detector may be designed
to detect only specific threat radars with predefined characteristics. Alternatively,
a radar detector may be triggered by any signal
in a particular frequency band.
A police radar detector is
a commercial radar detector that is designed to detect
police radar. Use of a police radar detector is
illegal in many areas.
A radar warning receiver (RWR) is a
type of radar detector commonly used in military systems
to detect when the platform is illuminated by an adversary's
radar.