Method and system for judging movement direction of electronic tag based on radio frequency identification

Abstract

The invention relates to a radio frequency identification-based electronic tag motion direction judgment method and system. The method includes the following steps that: when radio frequency antennas detect electronic tags, echo phases read by the radio frequency antennas are obtained, wherein at least two radio frequency antennas are adopted; the differences of adjacent echo phase values read by each radio frequency antenna are calculated; and the moving directions of the electronic tags can be judged according to the plus-minus signs of the differences of the adjacent echo phase values read by each radio frequency antenna. According to the technical schemes provided by the invention, the echo phases of the electronic tags are adopted as main parameters for direction judgment, error brought by factors such as environmental interference and multipath effects can be decreased from the data source; judgment is carried out by using the plus-minus signs of the echo phase differences, and therefore, influence caused by an intrinsic factor of phase cycle ambiguity can be eliminated, and judgment of the movement direction of the tags is more accurate; the calculation of the echo phase differences, and the judgment of the movement direction of the tags are low in complexity, and the timeliness of the judgment of the movement direction of the electronic tags is higher.

Description

technical field [0001] The invention relates to the field of radio frequency technology, in particular to a method and system for judging the movement direction of an electronic tag based on radio frequency identification. Background technique [0002] The control of important items involves the security of a unit or even the secrets of the party and the state. For a long time, it has relied on manual management. However, due to the cumbersome process, low efficiency and poor real-time performance of the manual management method, it will gradually be replaced by intelligent item control. Radio Frequency Identification (RFID), also known as radio frequency identification, is a communication technology that can identify specific targets through radio signals and read and write related data without the need for mechanical or optical establishment between the identification system and specific targets. touch. RFID readers are also divided into mobile and fixed. At present, RFI...

AI Technical Summary

Problems solved by technology

[0005] Since the echo signal strength of the electronic tag is easily affected by environmental factors, and due to the uncertainty of the readable distance of the electronic tag, the number of times the electronic tag is read by the reader within a certain period of time is uncertain. Therefore, the echo signal strength The method of time-weighting values ​​or reads is not precise enough

In addition, the motion judgment and positioning method based on the unscented Kalman filter is extremely complex and the convergence speed is very slow, which leads to a large time delay and limits its engineering application

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