Active radar reflector such as radar detector attached to e.g. protective helmet, has modulation unit which performs specific modulation on received radar signal according to electrical control signal

摘要

The active radar reflector has a reflector main structure comprising a radar antenna (200) for receiving a radar signal and for emitting a modified radar signal. The reflector main structure comprises a modulation unit (201) which is adapted to perform amplitude, phase, frequency, or polarization modulation with respect to received radar signal according to electrical control signal before returning back the characteristic way. The returned radar signal is more recognizable by characteristic modification. Independent claims are included for the following: (1) radar detector; (2) radar system; and (3) method for recognizing active radar reflector.