INDUCTION VEHICLE DETECTION AND IDENTIFICATION SYSTEM, INDUCTION LICENSE PLATE, AND INDUCTION READER

摘要

An induction vehicle detection and identification system comprising electronic identification devices with electronic memory, mounted on vehicles, and a reader capable of reading and/or writing data obtained from devices in HF-band. Devices have a non-volatile memory and are integrated into the vehicle's license plate. The reader combined with a magnetic frame is in a dielectric casing, which is mounted under the roadway. It generates an alternating magnetic field, which determines the detection and identification range. Minimum time the reader requires to read discrete responses generated by electronic identification devices and to identify the vehicle is less than 25 ms. The identification devices and the reader exchange data at the rate of 1 Kbit/sec or higher, and provide data encoding and decoding, as well as data access restriction.

主权项

1. An induction vehicle detection and identification system comprising electronic identification devices with electronic memory, mounted on vehicles, and a reader capable of reading and/or writing data obtained from devices in HF-band. It features devices integrated into the vehicle's license plate, embodied as resonators containing a multiturn loop connected to a microchip, powered by electricity induced by an external alternating magnetic field. A non-volatile memory unit stores identification data of vehicles, containing at least their license plate number.
The reader, equipped with a magnetic loop with the ratio of 1/5 to 1/2 between its perimeter and wavelength, is put into a dielectric casing, which is mounted under the roadway about 1 m deep. It generates an alternating magnetic field, which determines the detection and identification range. When signals reaching the loop are excited with power of up to 1 W, the range is 2 m long, reaches up to 1 m above the roadway and is as wide as the roadway. Minimum time the reader requires to read discrete responses generated by electronic identification devices and to identify the vehicle is less than 25 ms and proportionate to the vehicle speed (up to 250 km/h). The embodiments of identification devices and the reader enable them to exchange data at the rate of 1 Kbit/sec. These embodiments also provide the functions of data encoding and decoding, as well as data access restriction.