Electronic toll collection system
First Claim
1. An electronic toll collection system for automatically collecting tolls by establishing wireless communication between a roadside antenna installed in a tollgate and a vehicle unit installed in a traveling vehicle, comprising:
- at least ceiling portion of a road-to-vehicle wireless communication zone of the tollgate is covered with a structure having radio wave absorbing characteristic; and
the roadside antenna is disposed inside, or in front or rear of the structure.
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Accused Products
Abstract
The present invention intends to provide an electronic toll collection system for suppressing multi-path. For this end, the electronic toll collection system automatically collects tolls by establishing wireless communication between a roadside antenna 23 of a toll gate and a vehicle unit 33 installed in a traveling vehicle. It features a road-to-vehicle wireless communication zone of the tollgate covered with a structure 22 including radio wave absorbing material. The inner surface is preferably made from a radio wave absorbing member 11 including a mixture 13 of magnetic material and synthetic rubber. The roadside antenna 23 is installed inside the structure 22, thereby enabling the roadside antenna 23 to wireless communicate only with ETC vehicles traveling in the structure 22 and preventing multi-path between the roadside antenna 23 and vehicles traveling outside the structure 22 (or outside the communication zone).
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Citations
24 Claims
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1. An electronic toll collection system for automatically collecting tolls by establishing wireless communication between a roadside antenna installed in a tollgate and a vehicle unit installed in a traveling vehicle, comprising:
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at least ceiling portion of a road-to-vehicle wireless communication zone of the tollgate is covered with a structure having radio wave absorbing characteristic; and
the roadside antenna is disposed inside, or in front or rear of the structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19)
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12. An electronic toll collection system for automatically collecting tolls by establishing wireless communication between a roadside antenna installed in a tollgate and a vehicle unit installed in a vehicle, characterized in that:
the entire or a part of the inner surface of a roof covering a road-to-vehicle wireless communication zone of the tollgate, side walls, signboards, vehicle detectors, antenna supports, islands or the road near the road-to-vehicle wireless communication zone is covered with a radio wave absorbing member.
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20. An electronic toll collection system for automatically collecting tolls by establishing wireless communication between a roadside antenna installed in a tollgate and a vehicle unit installed in a traveling vehicle, characterized in that:
an interference radio wave radiation antenna for radiating an interference radio wave is provided independent of the roadside antenna for road-to-vehicle wireless communication in a tollgate for invalidating communication by radio wave leaked outside the road-to-vehicle wireless communication zone. - View Dependent Claims (21, 22, 23, 24)
Specification