Radio-communication vehicle identification system

Details Radio-communication vehicle identification system Radio-communication vehicle identification system

1998-10-16

2000-03-07

Pope, Daryl

Communications: electrical

Vehicle detectors

With camera

340933, 340539, 342 44, G08G 1017

Patent

active

060346256

ABSTRACT:
A radio-communication vehicle identification apparatus includes first and second radio communication units, a directional finding unit, a vehicle classification unit, and a vehicle identification unit. The first radio communication unit is mounted on a vehicle. The second radio communication unit is placed at a gate through which the vehicle passes to perform radio communication with the first radio communication unit. The directional finding unit measures an arrival angle of a radio signal transmitted from the first radio communication unit with respect to a reference direction. The vehicle classification unit detects a length of the vehicle on the basis of image data obtained by photographing the vehicle and classifies the vehicle on the basis of a detection result. When the vehicle has reached a predetermined position on the gate, the vehicle identification unit determines whether the arrival angle output from the directional finding unit falls within an arrival angle range of the radio signal from the first radio communication unit, which corresponds to vehicle classification data output from the vehicle classification unit, and identifies the vehicle having the first radio communication unit on the basis of a determination result.

REFERENCES:
patent: 5640156 (1997-06-01), Okuda et al.
"Direction Finding Technology and Application to Radio-communication Vehicle Identification System" by Atsushi Mitsuno et al., NEC Technical Jounal, vol. 50, No. 7, Jul. 25, 1997, pp. 147-155.
"Application of Directional Finder to the Electronic Toll Collection System" by Yoshihiko Kuwahara et al., Technical Report of the Institute of Electronics Information and Communication Engineers, vol. 97, No. 55, May 22, 1997, pp41-48.

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