RADIO SIGNALLING AND DETECTION METHOD AND SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 1997 - IPC

FIELD: systems protecting motor vehicles from stealing, systems detecting stolen motor vehicles. SUBSTANCE: alarm signal on violation of guarded boundary is sent first to owner of motor vehicle. Transmission of signal encoded by personal code of owner to central station is carried out with some delay from moment of transmission of signal to owner. Central station processes alarm signal and identifies it with protected object by isolation of personal code of owner. It sends signals for search and finding and determination of coordinates of motor vehicle with the aid of digital map at central station. Radio signaling and detection system has subscriber's post, repeaters and central station equipped with receiver, decoder, unit determining object and finding its location which output is connected to transmitter through encoder. Subscriber posts have hidden transmitters, group of repeaters, each including receiver with demodulator, decoder, pulse generator, shift register, encoder and transmitter with modulator. EFFECT: provision for automatic reception of information on theft of protected object directly from object from moment of stealing independent of method of stealing and for determination of its coordinates without request from owner. 4 cl, 6 dwg