TAG COMMUNICATION APPARATUS AND TAG COMMUNICATION SYSTEM
First Claim
1. A first tag communication apparatus, adapted to perform radio communications with a second tag communication apparatus and an RFID tag provided on a moving object, the first tag communication apparatus comprising:
- an antenna;
a controller, operable to cause the antenna to transmit first radio waves while changing a first direction that the first radio waves are transmitted;
a receiver, operable to receive a second radio waves transmitted from the second tag communication apparatus;
an extractor, operable to extract, from the second radio waves, synchronizing information indicative of a timing that the second tag communication apparatus changes a second direction that the second radio waves are transmitted therefrom; and
a synchronizer, operable to synchronize a timing that the controller changes the first direction with the timing that the second tag communication apparatus changes the second direction, based on the synchronizing information.
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Accused Products
Abstract
A first tag communication apparatus is adapted to perform radio communications with a second tag communication apparatus and an RFID tag provided on a moving object. A controller is operable to cause an antenna to transmit first radio waves while changing a first direction that the first radio waves are transmitted. A receiver is operable to receive a second radio waves transmitted from the second tag communication apparatus. An extractor is operable to extract, from the second radio waves, synchronizing information indicative of a timing that the second tag communication apparatus changes a second direction that the second radio waves are transmitted therefrom. A synchronizer is operable to synchronize a timing that the controller changes the first direction with the timing that the second tag communication apparatus changes the second direction, based on the synchronizing information.
21 Citations
6 Claims
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1. A first tag communication apparatus, adapted to perform radio communications with a second tag communication apparatus and an RFID tag provided on a moving object, the first tag communication apparatus comprising:
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an antenna; a controller, operable to cause the antenna to transmit first radio waves while changing a first direction that the first radio waves are transmitted; a receiver, operable to receive a second radio waves transmitted from the second tag communication apparatus; an extractor, operable to extract, from the second radio waves, synchronizing information indicative of a timing that the second tag communication apparatus changes a second direction that the second radio waves are transmitted therefrom; and a synchronizer, operable to synchronize a timing that the controller changes the first direction with the timing that the second tag communication apparatus changes the second direction, based on the synchronizing information. - View Dependent Claims (2, 3, 4, 5)
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6. A tag communication system, adapted to perform radio communications with an RFID tag provided on a moving object, the tag communication system comprising:
a pair of tag communication apparatuses, disposed so as to oppose each other, each of which is adapted to perform radio communications with the RFID tag and comprises; an antenna; a controller, operable to cause the antenna to transmit radio waves while changing a direction that the radio waves are transmitted; a receiver, operable to receive a tag information transmitted from the RFID tag in response to the radio waves transmitted from the antenna; a generator, operable to associate the tag information with temporal information indicative of when the receiver receives the tag information, and to generate a plurality of data sets including the temporal information and angle information which is indicative of the direction that the radio waves are transmitted when the receiver receives the tag information; and an estimator, operable to perform linear approximation with respect to a relationship between the temporal information and the angle information, and to estimate a direction that the moving object moves from a gradient of a line obtained by the linear approximation.
Specification