Active radio frequency identification system

Abstract

The invention discloses an active radio frequency identification system which comprises a card reader and an electronic label. The card reader and the electronic label are communicated through multiple stipulated frequency channels. A frequency hopping working mode is adopted in the electronic label. Data are initiatively transmitted on the frequency channels in turns. The card reader is provided with multiple radio frequency receiving circuits which are in the receiving state at the same time. Each radio frequency receiving circuit corresponds to one frequency channel. The problem of signal conflict in a thousand-class electronic label system is solved, interference by wireless signals outside the system can be effectively avoided and reading can be achieved efficiently without omission.

Description

[technical field] [0001] The invention relates to active radio frequency identification, in particular to an active radio frequency identification system. [Background technique] [0002] The existing active RFID system generally adopts two modes: frequency hopping and fixed frequency. The card has only one receiving frequency at a certain point in time, and then switches the working frequency in a certain time sequence. The working method of fixed frequency is: the electronic tag sends data at a fixed frequency, and the card reader also receives at a fixed frequency. [0003] The purpose of using the frequency hopping mode is to prevent wireless interference outside the system, because the same data in this mode needs to be sent repeatedly on different frequencies in one communication process, resulting in a large working current, which is not suitable for button battery power supply and needs Transponders that last for years. The active electronic tags used on a large sc...

AI Technical Summary

Problems solved by technology

With the increase in the number of tags, such as the home-school communication system, when more than a thousand electronic tags need to be read at the same time, the signal load on a single frequency point of the card reader is very heavy, and tag signal conflicts are prone to occur, which affects the reading of multiple tags

Although there are algorithms such as random delay for anti-collision processing, these algorithms cannot fundamentally solve the problem of channel load in a system where tags actively transmit in one direction, and cannot achieve obvious effects when the number of tags is large enough

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