Patent ID: 6507308
Filing Date: 2003-01-14
Classification: G01S

Abstract:
A microwave detector, comprising:heterodyne-type reception means equipped with an antenna for picking up microwave signals, a local oscillator for carrying out sweep operations, and a mixer for frequency mixing an output from the antenna with an output from the local oscillator, wherein the heterodyne reception means outputs detected wave signals based on an output from the mixer; a digital processing portion for receiving the detected wave signals outputted from the reception means, the digital processing portion further for outputting a high pulse when a level of the detected wave signals reaches or exceeds a prescribed reference level, and a low pulse when the level of the detected wave signals is below the reference level; sweep control means for controlling a sweep operation of the local oscillator based on the high and low pulses outputted from the digital processing portion; and judgment means for judging whether or not a detection target microwave signal has been detected based on at least a time duration of the high pulses outputted by the digital processing portion.