METHOD OF IDENTIFYING VEHICLES AND DETECTING WANTED CARS WHEN PASSING THROUGH CHECKPOINTS AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2013 - IPC G08G1/17 G08G1/04 G08B25/10 

FIELD: physics.

SUBSTANCE: group of inventions relates to systems for monitoring vehicle traffic. In the method of identifying vehicles and detecting wanted cars, when vehicles pass through checkpoints, signal codes received at the checkpoints are compared with codes of wanted vehicles and a decision to impound the vehicle is made based on the comparison results. Vehicles are fitted with transponders which match the number plate of the vehicle. Checkpoints are fitted with scanners. An apparatus which realises the method has at a checkpoint an ultrasonic transmitter, a radio signal transmitter, a radiation receiver and a decoding unit. The vehicles have transponders in form of a piezoelectric crystal whose surface is coated with two aluminium thin-film interdigital transducers whose structure corresponds to the number plate of the vehicle in radio- and ultrasonic bands, and a common set of reflectors, wherein each transducer has a comb-type system of electrodes connected to each other by lines which are connected to a common microstrip transceiving antenna, also deposited on the surface of the piezoelectric crystal.

EFFECT: high efficiency of identifying vehicles.

2 cl, 2 dwg