Identification method and system for motion state of radio frequency identification tags

Abstract

The invention relates to an identification method and system for the motion state of radio frequency identification tags. The method includes the step A that two sides of a check point are respectively provided with a directional antenna, the directions of the two direction antennas both are opposite to that of the check point, and distinction threshold values of forward pass or no-pass and distinction threshold values of backward pass or no-pass are set; the step B that signal strength, read by the two directional antennas, of the same radio frequency identification tags is differentiated to form difference curves; the step C that sine functions are used as generating functions, convolution calculation is carried out on the difference curves, and response curves are obtained; the step D that characteristic parameters on the response curves are selected and compared with the set threshold values at the step A, and then judgment results that whether the radio frequency identification tags forward pass or not pass and backward pass or not pass the check point can be obtained. The system comprises a threshold value setting and storing module, a difference curve generating module, a response curve generating module and a comparing and analyzing module. According to the method and system, identification error is small and both the moving direction and moving speed of the tags can be judged, and the method and the system are simple and convenient to use.

Description

technical field [0001] The invention relates to the field of radio frequency identification, in particular to a method and system for identifying the movement state of a radio frequency identification tag. Background technique [0002] In the active radio frequency identification (RFID) system, there is a large class of application requirements for identifying the passing and passing direction of RFID tags. Typical applications include secret / important asset entry and exit inspection systems, and personnel entry and exit automatic registration. System, vehicle barrier-free access inspection system. [0003] This type of system generally consists of two parts: assets carrying RFID tags, personnel or vehicles, and an inspection point. The inspection point generally includes a set of RFID reading equipment and a set of inspection software. [0004] A typical active RFID entry and exit identification and judgment system consists of figure 1 shown. In this type of active RFID ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method and system for identifying the movement state of radio frequency identification tags, which makes the calculation simple, the error is small, and the movement direction and speed of the label can be judged at the same time, thereby overcoming the large judgment error of the existing radio frequency identification system , unable to judge the lack of running speed

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