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Device for locating a moving body having a response unit
| Details |
Inventors: Nishimura, Yoshihiro; Tanahashi, Iwao; Nakamura, Kazumasa; Yagi, Kouichi;
Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho (Aichi-ken, JP); Toyota Jidosha Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Hofsass; Jeffery
Assistant Examiner: Tweel, Jr.; John
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
A device for locating a moving body includes: an interrogation unit (10) for communicating with a response unit (50) mounted on a vehicle (51) present in a lane of a communication zone "a"; receiving antennas (21, 22) having receiving areas "21b, 22b" divided in the width direction of the lane; and a processor (40) for determining the position of the vehicle in the communication zone based on a reception result from the receiving antennas. The device may also include a detecting device such as an imaging device (30) having an imaging area "c" of a size equal to the lane. This makes it possible to recognize an unauthorized vehicle (52) not having a response unit and thus passing through the imaging area "c" without a radio signal to be received by the receiving antennas (21, 22). |
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DETAILED DESCRIPTION This invention, which was conceived in view of the aforesaid problems, aims to locate vehicles carrying a response unit without causing radio interference between interrogation units, and to identify unauthorized vehicles that pass by without communicating.
A device according to one aspect of this invention comprises an interrogation unit having a predetermined communication zone, said interrogation unit transmitting a radio signal to said communication zone where a moving body having a response unit for receiving said radio signal passes, a receiving device having a plurality of receiving areas at least in the width direction of a travel path of said moving body so as to cover said communication zone, said device being capable of receiving distinguishably each signal form said plurality of receiving areas, and processor for determining the position of said moving body in said communication zone based on a reception result of said receiving device.
When a moving body having the response unit enters the communication zone, the receiving device sends a radio signal to the response unit, and when the response unit receives this signal from the interrogation unit.
A receiving device receives a response signal from a response unit.
The receiving device corresponding to a receiving area in which a response unit is located can receive the response signal.
The position of the moving body can therefore be identified.
According to this aspect of the invention, a whole travel path at least in the width direction of the moving body is covered by one communication zone and the receiving device can catch distinguishably each signal from the plurality of the receiving areas covering the communication zone.
This enables to determine the position of the moving body without complicated control of scanning in accordance with the movement of the moving body.
Another aspect of the invention further comprises a detecting device for detecting the moving body when it enters the communication zone, thereby locating a plurality of said moving bodies in said communication zone based on a detection result thereof and the reception result of said receiving device, and or recognizing the existence of an unauthorized moving body without a proper response unit based on the detection result thereof and based on non-existence of the reception result of said receiving device
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