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Fast self-adaptive adjustment method of working frequency of rfid reader

A technology of self-adaptive adjustment and working frequency, applied in the direction of instruments, inductive record carriers, electromagnetic radiation induction, etc., can solve the problems of software processing time and difficult to meet the use requirements, so as to save software processing time and deal with rapid dynamic changes. The effect of environmental interference and faster response speed

Active Publication Date: 2020-09-18
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The signal processing and frequency compensation operations of this method are all implemented by software, there is software processing time, the response speed is limited, and it is difficult to meet the use requirements when encountering fast and dynamically changing environmental interference

Method used

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  • Fast self-adaptive adjustment method of working frequency of rfid reader
  • Fast self-adaptive adjustment method of working frequency of rfid reader
  • Fast self-adaptive adjustment method of working frequency of rfid reader

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Embodiment Construction

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] figure 1 It is the overall method flow of the present invention. Before introducing this method, the working principle of the low-frequency RFID system (including the reader body, the radio frequency antenna and the RFID tag), the resonance principle of the series RLC radio frequency antenna circuit, the influence of environmental interference on RFID communication and the principle are briefly ...

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Abstract

The invention belongs to the technical field of wireless communication, and discloses a quick self-adaptive adjustment method for working frequency of an RFID reader. The RFID reader comprises a reader body and a radio frequency antenna. The radio frequency antenna comprises a radio frequency antenna resistor R, an inductor L and a capacitor C. The method comprises the following steps: 1) frequency output of a phase locked loop circuit; 2) working of the radio frequency antenna; 3) solving of a phase difference waveform; 4) quantization of the phase difference waveform; 5) voltage feedback regulation. According to the invention, the RFID working frequency is quickly and automatically adjusted to be the same as the resonant frequency of the radio frequency antenna according to the environmental change through the hardware feedback regulation method, and the response speed is accelerated and environmental interference changing quickly and dynamically can be handled more quickly comparedwith a software adjustment method. Therefore, self-adaptive adjustment of working frequency is realized.

Description

Technical field [0001] The invention belongs to the field of wireless communication technology, and more specifically, relates to a method for fast adaptive adjustment of RFID operating frequency. Background technique [0002] "Radio frequency identification technology" is generally referred to as RFID, which is a communication method that uses radio signals to identify targets and read related data. The application of RFID technology is ever-changing, and the working environment has a great impact on RFID communication. For example, in the working environment of oil extraction pipelines, underground shield construction, and industrial production lines, mobile working media and metal interference (such as: mud, shield machine, drilling Equipment, etc.) have become the main factors affecting RFID communication. Environmental interference changes the impedance of the radio frequency antenna of the RFID system (including the reader body, radio frequency antenna and RFID tag), causi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/10
CPCG06K7/10198G06K7/10316
Inventor 陶波虞苏璞周彪尹周平
Owner HUAZHONG UNIV OF SCI & TECH
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