Method and system for estimating number of RFID tags

Abstract

The invention discloses a method and a system for estimating the number of RFID tags. The method comprises the following steps of: setting an initial receiving window value; establishing a relation model of the collision time slot proportion and the average tag number in the collision time slot; setting an initial receiving window value of a RFID reader; letting the RFID reader send a radio frequency signal and receive a response code of the tags; counting the number of idle time slots, successful time slots and collision time slots, and calculating a collision time slot proportion; calculating the average tag number in the collision time slot according to the collision time slot proportion and the relation model of the collision time slot proportion and the average tag number in the collision time slot; and calculating an estimated value of the number of tags according to the number of successful time slots, the number of collision time slots and the average number of tags in the collision time slots. According to the method and the system, the technical problems of how to analyze the number of tags by utilizing the relationship between the collision time slots and the number of unrecognized tags and how to improve the algorithm accuracy and reduce the complexity by combining secondary interval estimation are solved.

Description

technical field [0001] The invention belongs to the technical field of label identification, and in particular relates to a method and system for estimating the quantity of RFID labels. Background technique [0002] As a non-contact target object identification and tracking technology, RFID tag identification technology has been widely used in many fields such as life and production. At present, RFID tag recognition technology reduces the collision rate in RFID tag scanning by estimating the number of tags, thereby improving the recognition rate. Therefore, how to accurately estimate the number of tags is a key technology to improve the efficiency of RFID data collection. [0003] Existing label estimation algorithms are mainly divided into two categories: analytical estimation algorithms and interval estimation algorithms. Among them, the analytical estimation algorithm is to estimate the number of tags by establishing a mathematical formula between the number of tags and...

AI Technical Summary

Problems solved by technology

Although this type of label estimation algorithm is superior in terms of stability and computation, its complex calculation process leads to high complexity of the algorithm, making it difficult to apply to embedded systems with small computation.

[0005] In view of the problems in the above algorithm, there is currently no technical solution to use the relationship between the collision time slot and the number of unidentified tags to analyze the number of tags and combine the quadratic interval estimation to improve the accuracy of the algorithm and reduce the complexity.

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