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Location of a transponder center point

By decoupling the identification ID and radio transmission of the transponder and using cross antennas to detect the center point of the transponder, the problem of inaccurate vehicle positioning in the tunnel is solved, high-precision vehicle position identification is achieved, and the safety of the transponder center point is ensured. and accuracy.

Inactive Publication Date: 2014-05-07
THALES CANADA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the point of view of radio transmission, it is difficult to guarantee that the coverage area will not exceed its specified value
[0004] Since there is no guarantee that the train will stop precisely in the station, especially a station with a platform door, it is estimated that it is not good enough
While expensive transponders ensure that the coverage area is optimized, the position of the transponder cannot be guaranteed in a safety-critical manner due to the nature of radio transmissions

Method used

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Examples

Experimental program
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Embodiment Construction

[0015] An RFID system generally consists of three components: a transponder or tag (or multiple tags), a reader or interrogator, and the necessary supporting infrastructure (hardware and software).

[0016] An RFID reader or interrogator is a device that communicates with RFID tags. It broadcasts the radio signal received by the tag. The tag then uses the energy provided by the transmitter to transmit its information back to the reader. The reader may be a portable handheld terminal or a fixed device on a moving vehicle such as a train, used to determine location / location determination.

[0017] An RFID tag, also known as a transponder, is usually a small piece of material that typically includes three components: an antenna, a microchip unit containing a storage device, and packaging materials. Tags can be read-only or read-write tags. These terms refer to whether the information stored on the label can be changed or erased. The read-only tag is in the form of an RFID tag with...

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PUM

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Abstract

In a radio location system for vehicles moving along a guideway, a transmitter for energizes a transponder beside the guideway. A first detector detects a response signal from the energized transponder to determine the transponder identification. A second detector detects a positional signal received from the transponder that is decoupled from the first signal and contains precise positional information. In one embodiment, the second detector picks up a crossover signal from a crossover antenna.

Description

Technical field [0001] The present invention relates to the field of vehicle positioning systems, and in particular to the precise positioning of mobile vehicles equipped with transponders. Background technique [0002] Transponders, especially RFID (Radio Frequency Identification) transponders are used to obtain the absolute position of a vehicle such as a train moving along a track. However, the transponder extends to cover a limited distance called a footprint, and due to the nature of radio transmission, it is difficult to locate the center of the transponder (RFID) to provide accurate location information, especially in tunnels. [0003] Recently, the best solution is to estimate the position of the center point of the transponder through an external device or use an expensive transponder. These control the coverage area of ​​the transponder to ensure the correct identification of the location. However, from the point of radio transmission, it is difficult to ensure that the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/75B61L25/02
CPCB61L25/025G01S1/14G01S13/82G01S13/84B61L3/121B61L3/125B61L2027/204B61L25/02G01S13/75
Owner THALES CANADA INC