A RFID reader antenna positioning method based on reverse positioning of tags

Abstract

The present invention discloses an RFID reader antenna location method of based on tag reverse positioning. The method comprises the steps: acquiring a plurality of time points at which positions of a plurality of tags respectively change relative to a straight line between a reference antenna and a plurality of to-be-positioned antennas; calculating the distance between the reference antenna and the adjacent to-be-positioned antennas and the distance between two to-be-positioned antennas; calibrating the positions of each to-be-positioned antenna according to the calculated distance; calculating the corresponding error compensation value of the to-be-positioned antenna according to the distance between the to-be-positioned antenna and the reference antenna; and adding the distance between the to-be-positioned antenna and the reference antenna with the error compensation value to obtain the current position of the to-be-positioned antenna. The method enables real-time antenna location updating and determines the antenna location map without additional position measurements, and provides foundation and assurance for subsequent tag precise positioning functions.

Description

technical field [0001] The invention relates to the fields of radio frequency tag systems and wireless positioning, and more particularly relates to a RFID reader antenna positioning method based on tag reverse positioning. Background technique [0002] Radio Frequency Identification (RFID) is an automatic identification system that uses radio frequency signals to realize non-contact information transmission through spatial coupling (alternating magnetic field or electromagnetic field), and realizes identification and data exchange functions through the transmitted information. The principle is: after the tag enters the magnetic field, if it receives a special radio frequency signal from the reader, it can send out the product information stored in the chip by virtue of the energy obtained by the induced current (ie PassiveTag, passive tag or passive tag), or Actively send a signal of a certain frequency (ie Active Tag, active tag or active tag), the reader reads and decodes...

AI Technical Summary

Problems solved by technology

However, such an assumption is unreasonable in practical applications

This is because in practical applications, most of the personnel who deploy readers and antennas are workers who lack professional knowledge, and they cannot help system designers to configure the position of antennas in the system or deploy antennas according to the precise requirements of the system

In addition, although the antenna will remain stationary after deployment in most cases, the position of the antenna may still change due to the rearrangement or even slight movement of the load (bookshelves, shelves, etc.), which makes the automatic updating of the antenna position an important task. necessary

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