VEHICLE ANTITHEFT DEVICE Russian patent published in 2009 - IPC B60R25/04 

FIELD: transportation.

SUBSTANCE: invention is related to devices for prevention of unauthorised use or theft of transport means (TM) with use of radio channel. Control post is equipped with transmitter, comprising master oscillator, modulating code generator, phase manipulator, power amplifier, duplexer, transceiving antenna, high frequency amplifier, heterodyne, two mixers, two multipliers, band filter, phase detector, computer, two phase changers of 90°, two amplifiers of intermediate frequency, summator, narrow-band filter 80, amplitude detector and switch. Receiver installed on TM comprises antenna, high frequency amplifier, heterodyne, two mixers, two amplifiers of intermediate frequency, two phase changers of 90°, summator, multiplier, narrow-band filter, amplitude detector, two switches, two meters of spectrum width, frequency doubler, comparison unit, two threshold units, frequency divider into two, narrow-band filter, phase detector, unidirectional valve and accumulator. Executive unit available on TM includes ignition switch, accumulator, ignition coil, switch, breaker, two relays, four signal lamps, sound alarm, unit of time delay, transistor, two resistors, voltage reference diode and capacitor. TM transponder comprises piezocrystal, set of reflectors, system of electrodes, microstrip antenna, two busbars.

EFFECT: increased noise immunity of receivers and reliability of remote search and detection of stolen TM by means of false signals suppression received by mirror and combination channels.

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