FIELD: physics.
SUBSTANCE: invention concerns Doppler sensors and can be used in burglar alarm systems as sensing unit. Device contains carrier frequency generator connected to signal transmitter and at the same time to driving input of synchronous detector of the first channel and input of phase shifter which output is connected to driving input of synchronous detector of the second channel, receiver of reflected signal. Also, device design includes amplifier, synchronous detectors of the first and second channels, band-pass filters, cross-correlation converter, and threshold devices with threshold crossing counters. Device has output for connection to alarm signal shaper.
EFFECT: high noise immunity; ability to provide protection of premises of great area; manufacturability; adjustability and ease of use.
7 cl, 5 dwg
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