VEHICLE ANTITHEFT SYSTEM Russian patent published in 2002 - IPC

FIELD: antitheft protection devices. SUBSTANCE: invention is aimed at protection of vehicles from unauthorized use. Vehicle-mounted equipment includes supply source, current-limiting resistor, remote control switch, light-emitting diode, sealed contact reed relay, ignition switch intermittent signal generator, electromagnetic relay, master oscillator, phase key transmitter and transmitting antenna. Receiving post on flight vehicle has receiving antennas, search unit, heterodynes, mixers, first intermediate frequency amplifiers, detector, spectrum width meter, frequency double, comparator unit, threshold unit, delay line, keys, frequency meter, recorders, second intermediate frequency amplifier, frequency detector, trigger, multipliers, narrow-band filters and phase detectors. Phase method of direction finding of hijacked vehicles by means of five receiving antennas arranged in form of asymmetrical geometric cross is proposed. Having received information of frequency, modulating code and location of hijacked vehicle, traffic police members take measures for arresting the criminal. Information from flight vehicle is transmitted by radio channel to search and capture groups. EFFECT: facilitated location of vehicle. 4 dwg