SAW RFID tag range-finding method based on multi-frequency phase difference

A distance measurement method and phase difference technology, applied in the field of measurement, can solve the problem of low precision, achieve precise distance measurement accuracy, and improve the effect of the maximum unambiguous distance

Active Publication Date: 2017-11-07
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, when electromagnetic waves propagate in free space, the energy loss is caused by many factors, not just related to the propagation distance, so the RSSI method is often not accurate in measuring the tag distance.

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  • SAW RFID tag range-finding method based on multi-frequency phase difference
  • SAW RFID tag range-finding method based on multi-frequency phase difference
  • SAW RFID tag range-finding method based on multi-frequency phase difference

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0026] Such as figure 1 As shown, the SAW RFID tag ranging method based on multi-frequency phase difference provided by the present invention comprises steps:

[0027] Step 1. Assume that the maximum frequency interval of the query signal transmitted by reader 1 is Δf max =10MHz, select three frequency points to construct frequency difference to realize multi-frequency phase difference SAW RFID tag ranging. According to the formula (1), select Δd=5, can calculate ξ 1 =8, ξ 2 =25, then there is Δf 1...

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Abstract

The invention provides an SAW RFID tag range-finding method based on multi-frequency phase difference, and the method comprises the steps: constructing a congruence equation to solve range ambiguity, carrying out temperature compensation for the parameters, affected by the temperature changes, of an SAW tag through a temperature measurement reflection grid disposed in the SAW RFID tag, and calculating a false range caused by the time delay in the SAW tag. The method achieves the correction of an unambiguous distance after the solving of the range ambiguity through the false range, thereby obtaining a measurement value of a real distance between a reader and the SAW tag.

Description

technical field [0001] The present invention relates to the technical field of measurement, in particular to a method for measuring the distance of a SAW RFID tag based on a multi-frequency phase difference. Background technique [0002] Radio Frequency Identification (RFID) uses radio frequency signals to identify targets and obtain relevant data. It is a non-contact tag technology. It is precisely because of its non-contact characteristics that no manual intervention is required in the identification process, which is conducive to the realization of system automation. In recent years, RFID technology has been widely used in logistics management, anti-counterfeiting, animal husbandry monitoring and management, automatic highway toll collection, tracking and positioning. [0003] The radio frequency tag using surface acoustic wave (Surface Acoustic Wave, SAW) technology is a purely passive radio frequency identification technology without any semiconductor integrated circui...

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Application Information

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IPC IPC(8): G01S17/08
CPCG01S17/08
Inventor 韩韬阮静平史汝川张晨睿
Owner SHANGHAI JIAO TONG UNIV
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