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Ofdm-based rf tag indoor positioning system and method

A positioning method and label technology, applied in the field of positioning, can solve the problems such as the difficulty in judging the distance and angle of the RF reader, easy to cause errors, and unable to meet the requirements of high-precision positioning

Active Publication Date: 2022-05-17
重庆谷庚科技有限责任公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The RF signal has to be reflected from different obstacles before reaching the LMU. Due to the many obstacles in the indoor environment and the limited space, it is difficult for the RF reader to judge the distance and angle, which is easy to cause mistakes, resulting in large positioning errors.
Can not meet the requirements of indoor high-precision positioning

Method used

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  • Ofdm-based rf tag indoor positioning system and method
  • Ofdm-based rf tag indoor positioning system and method
  • Ofdm-based rf tag indoor positioning system and method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] Such as figure 1 As shown, it is a block diagram of the RF tag positioning system based on OFDM, and the RF reader transmits a high-power pure carrier signal to the RF tag. Including: RF reader, RF tag, position measurement unit LMU, RF reader sends high-power pure carrier to provide energy to the RF tag through the RF transceiver, modulates the authentication and identification information of the target tag, and decodes the authentication and identification information of the tag , to complete the energy supply and communication with the tag. The RF tag obtains the induced current from the RF reader through the antenna to supply energy for the tag, and the induced current carrying the information passes through the RF front-end circuit, and the detected digital signal is sent to the logic control circuit for information processing, and the backscattered signal pass...

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Abstract

The invention discloses an OFDM-based RF tag indoor positioning method and system. It relates to an indoor positioning technology. RF reader transmits high power pure carrier signal f p After the RF tag receives this high-power signal and is activated by power supply, it modulates the stored tag identity information and OFDM sequence information onto the carrier signal, and backscatters the modulated signal to the position measurement unit LMU. The LMU extracts the RF tag information from the received signal, and calculates the p Frequency-centered channel state response information containing multiple subcarriers, and the above channel state response uses fractional Fourier transform to obtain a function of signal delay, which is used to estimate the distance from the RF tag to the LMU, and uses the reflection path suppression algorithm to find the RF tag Accurate distance to LMU; LMU establishes an array flow pattern about subcarrier phase difference and angle according to the channel state response under multi-carrier and multi-antenna, and solves the AOA of the signal; LMU obtains the distance information and angle information of the RF tag, and combines the two information Realize single-station positioning of RF tags.

Description

technical field [0001] The invention belongs to positioning technology and relates to indoor positioning of RF tags. Background technique [0002] Radio Frequency Identification Technology RFID (Radio Frequency Identification) is a non-contact automatic identification technology. The RFID system consists of three parts: scanning antenna, RF (radio frequency) reader, and RF (radio frequency) tag. RF tags consist of a microchip, memory and antenna. Radio Frequency Identification uses electromagnetic fields to automatically identify RF tags attached to objects, which contain electronically stored information. The passive tag collects energy from the radio waves of the attached RFID reader, and the LMU estimates the distance between the LMU and the tag by obtaining the CSI (Channel State Information) signal. After obtaining the CSI signal under multi-antenna and multi-carrier , can realize the wireless positioning of the tag. Moreover, the RFID tag does not need to be in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/80H04W4/33H04W64/00H04B17/391H04L27/26
Inventor 金悦
Owner 重庆谷庚科技有限责任公司