FIELD: radar.
SUBSTANCE: invention relates to radar and can be used in security alarm sphere in particular for detecting intruder upon its invasion in detection zone, created by double-frequency pulse-Doppler alarm device. Device comprises of microwave module microwave generator the first and the second filters, the first, the second and the third ADC, processor, subtractor, controlled amplifier, timing unit, the first and the second synchronous detectors and actuator device (relay). Microwave module comprises an antenna with a circular beam pattern, decoupler and frequency converter. Processor is manufactured with capability of gain drift of adjustable amplifier, estimating parameters of received signal, formation of compensation of pulses for eliminating the constant level of the useful signal and taking a final decision on detection of an intruder with generation of signal of the device actuation (alarm signal).
EFFECT: technical result consists in improvement of accuracy of detecting intruder by eliminating the constant level of the useful signal, two phases of Doppler signals analysis and elimination of ambiguity for determination of Doppler information on the intruder.
3 cl, 4 dwg
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