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Positioning method for wireless radio frequency recognition system and device thereof

An identification system, radio frequency technology, applied in radio wave measurement systems, cooperating devices, reflection/re-radiation of radio waves, etc. Accurate and reliable, improving positioning accuracy, and the effect of strong adaptability

Inactive Publication Date: 2008-02-27
MACAU UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0004] In the above two methods, in the NLOS environment, due to the existence of reflection and scattering phenomena, the information propagation delay estimated by the reader includes the delay of the direct signal and the additional delay caused by reflection or scattering, and the reader The signal energy received by the writer is also affected, resulting in inaccurate positioning

Method used

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  • Positioning method for wireless radio frequency recognition system and device thereof
  • Positioning method for wireless radio frequency recognition system and device thereof
  • Positioning method for wireless radio frequency recognition system and device thereof

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Embodiment Construction

[0032] Referring to Figure 1, it is a schematic diagram of positioning based on TOA technology in an NLOS environment in the prior art. The radio waves emitted by the tag to be tested are respectively read-write device 1, reader-writer 2, reader-writer 3 and reader-writer 4 Receiving, according to the time when each reader receives the signal and the time stamp loaded in the transmitted signal, the propagation delay of the signal from the tag to be tested to the reader is obtained, that is, TOA information, and the propagation speed of the radio wave is known is c (ie 3×10 8 m / s), so that the distance between the tag to be tested and the reader can be converted, the reader is used as the center of the circle, and the distance converted according to the propagation delay is used as the radius to make a circle, and the intersection point of each circle is the to-be-reader position of the label. However, in the NLOS environment, due to reflection, scattering and other phenomena,...

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Abstract

The invention is the location method in wireless radio-frequency recognition system. By the receiving signal transmission time extending of detected label and the weighted least square TOA location method, it gets a group of estimating position set; then by the signal strength of the detected label and the reference label and the RSSI location method, it gets a primary estimating position. According to the primary estimating position, it judges the distance of non stadia error in the sets and estimates the error size to renew the weighted matrix, then it estimates the position according to the weighted matrix to get the finial position. The method has combined the TOA and the RSSI position method, so it has inhibited the influence of NLOS error and improved the RFID system location precision.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a positioning method and a device for a radio frequency identification system suitable for NLOS (non-line-of-sight) conditions in wireless communication. Background technique [0002] With the popularization and development of mobile computing devices, wireless positioning technology has attracted increasing attention. RFID (Radio Frequency Identification) is a technology that uses radio frequency signals to achieve contactless information transmission through spatial coupling (alternating magnetic fields or electromagnetic fields) and through The technology that the transmitted information achieves the purpose of identification. The RFID system is mainly composed of two parts: an RFID tag with an identity mark (ID number), and an RFID reader that reads information from the tag or writes information into the tag. RFID Due to the low cost of the tags, the system is ...

Claims

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Application Information

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IPC IPC(8): G01S13/74G06K17/00G06K19/07
Inventor 赵军辉张禹强
Owner MACAU UNIV OF SCI & TECH
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