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.
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.