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RFID tag device, RFID reader/writer device, and distance measuring system

A writer and distance information technology, applied in the field of RFID tag devices, can solve the problems of long time, increased cost, and difficulty in measuring distance accurately.

Inactive Publication Date: 2007-03-07
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that when sequentially transmitting a plurality of interrogation waves having stepwise different arrival distances, a control section is required, thereby resulting in an increase in cost, and it takes a long time since access is performed multiple times using different interrogation waves. time
[0009] As described above, according to the above-mentioned systems, there are problems of high cost, long time required, and difficulty in measuring distance accurately

Method used

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  • RFID tag device, RFID reader/writer device, and distance measuring system
  • RFID tag device, RFID reader/writer device, and distance measuring system
  • RFID tag device, RFID reader/writer device, and distance measuring system

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Embodiment Construction

[0023] FIG. 1 is a diagram showing a configuration example of a distance measuring system according to an embodiment of the present invention. This distance measuring system has an RFID (Radio Frequency Identification) reader / writer device 101 and an RFID tag device 102 . Hereinafter, the RFID reader / writer device is simply referred to as a reader / writer (R / W), and the RFID tag device is simply referred to as a tag.

[0024] The tag 102 has an antenna section 103 and a tag IC 104 . The reader / writer 101 and the tag 102 can communicate with each other through radio frequency signals. The reader / writer 101 can transmit an ID number inquiry wave (inquiry signal) to inquire about the ID number (identifier) ​​of the tag 102 . When receiving this ID number inquiry wave, the tag 102 transmits its own ID number to the reader / writer 101 . The number of tags 102 can be one or more. When a plurality of tags 102 are provided, each tag 102 has a different ID number. The reader / writer ...

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Abstract

An RFID tag , which includes an analog / digital conversion circuit for converting a signal representing the strength of a signal received by the tag via an antenna from an analog format to a digital format, and a transmission circuit for transmitting the signal in digital format, or a signal derived therefrom, via the antenna. An RFID reader / writer device is also disclosed, which includes a transmission circuit for transmitting a signal via an antenna to an RFID tag, and a conversion circuit for receiving a signal representing the strength of a signal transmitted via the antenna, and obtaining from that signal information about the distance (LE) between the RFID tag and the reader / writer.

Description

technical field [0001] The present invention relates to RFID tag devices, RFID reader / writer devices and distance measurement systems. Background technique [0002] In the following Patent Document 1, a destination guidance system is described, which includes: a destination RFID attached to guide objects or positions in space, includes a plurality of antennas with different communication distances, and responds to incoming interrogation waves Send the response wave that contains the unique identification information corresponding to this antenna from each antenna; With the position judging device, according to the combination of the identification information recognized by a plurality of reading devices for the same destination RFID, it is judged that each destination RFID is in the guide position in space. However, when multiple antennas are used, the cost of the system becomes high. [0003] Furthermore, in Patent Document 1, a destination guidance system is described, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/75
CPCG06K19/0715G01S11/06G06K19/0723G06K19/0701H04L27/02G06K17/00G01S13/75
Inventor 山崎大辅安杰伊·拉德基后藤邦彦
Owner FUJITSU LTD