RADIO BEAM INTRUSION DETECTOR Russian patent published in 2015 - IPC G08B13/00 

FIELD: physics.

SUBSTANCE: method of performing independent control of sensitivity on each of N sections of a detection area, divided using chirp range selection, as well as combined correlation processing of Doppler signals corresponding to defined sections of the detection area based on the level, onset time, duration, rate of change and number of the section in different combinations or interrelationships which reflect the typical effect of interference and behaviour of an intruder in the detection area. The radio beam intrusion detector comprises a reference frequency generator, a linearly variable voltage generator, a controlled microwave signal generator with a transceiving antenna, a signal mixer, series-connected amplifier, band-pass filter, frequency analysis unit, frequency spectrum harmonic signal processing unit, connected with distance from the radiation point to the target (range harmonic), switches for the sections of the detection area and a sensor output signal former. The device further includes: a data recording and storage device which sets modes of the range harmonic signal processing unit separately for each range harmonic, a range harmonic signal correlation analysis and processing unit which jointly processes signals of the frequency analysis unit, analysers correlation parameters thereof and generates a signal to the second input of the sensor output signal former.

EFFECT: high noise-immunity of the sensor and reliability of detection.

2 cl, 1 dwg