FIELD: information technology.
SUBSTANCE: device contains Doppler UHF sensor 1, antenna 2, very-low-frequency seismic sensor 3 of vehicle body bouncing, controlled radio transmitter 5, as well as radio receiver 14 with radio frequency amplifier 15, phase doubler 16, spectrum analysers 17 and 18, comparator unit 19, key 20, amplitude limiters 21 and 25, phase-lock detector 22, audio signals amplifier 23, sound emitting device 24, narrow-band filters 26 and 28, phase-halving circuit 27, frequency detector 29, balance switch 31, phase detector 32, multipliers 34 and 35, phase shifters 36 - for +45°, 37 - for -45°, phase shifter 41- for +90°, low pass filters 38 and 39.
EFFECT: higher device resistance to narrow-band interference due to their suppression.
2 dwg
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