A method and system for identifying the movement state of a radio frequency identification tag

Abstract

The invention relates to a method and system for identifying the movement state of a radio frequency identification tag. The method includes: setting a directional antenna on both sides of the check point, and the two directional antennas are facing the opposite direction of the check point, and set to distinguish the forward direction. The threshold for distinguishing pass and fail and the threshold for distinguishing reverse pass and fail; the signal strength of the same RFID tag read by two directional antennas is compared to form a difference curve; with the sine function as the parent function, the The difference curve is convoluted to obtain the response curve; the characteristic parameters on the response curve are selected and compared with the threshold value set in step A, and the judgment conclusion of the radio frequency identification tag passing in the forward direction, reverse passing, and failing the inspection point is obtained . The system includes a threshold setting and storage module, a difference curve generation module, a response curve generation module and a comparison and analysis module. The recognition error of the present invention is small, and the moving direction and moving speed of the label can be judged at the same time, which is simple and convenient.

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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