CN101539984A

CN101539984A - Realization method for active read-only frequency hopping electronic tags

Info

Publication number: CN101539984A
Application number: CN200810034874A
Authority: CN
Inventors: 赵明; 欧海涛; 陈黄海; 耿波; 徐双; 赵春宇
Original assignee: SHANGHAI RUIFAN INFORMATION SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: SHANGHAI RUIFAN INFORMATION SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2008-03-20
Filing date: 2008-03-20
Publication date: 2009-09-23

Abstract

The invention provides a realization method for active read-only frequency hopping electronic tags. Aiming at the requirements that an active electronic tagging system ensures good anti-collision property, operational stability and reliability, long service life and low cost of the tags, and a timer consisting of a specified counter and a random code list multi-channel selector is designed to replace a microprocessor so as to control the operating mode of radio frequency circuits . A random channel generated by a random code list ensures that the radio frequency circuits with different tags can be mutually staggered in a transmit channel so as to establish a better frequency hopping anti-collision mechanism in a low cost mode; and the radio frequency circuits only send ID identification information of the tags in the communication status, ID identification of the tags is fixedly written into the radio frequency circuits in production, and the ID identification of different tags is formed in an increasing or decreasing mode. The design method ensures that the active ready-only tags have a frequency hopping mechanism, avoids the defects of instability and unreliability brought by using the microprocessor in the conventional active electronic tags, eliminates a great deal of unwanted system overhead, greatly improves the operational reliability of the tags, and simultaneously reduces the power consumption and the cost of the tags.

Description

A kind of implementation method of active read-only frequency hopping electronic tags

Affiliated technical field

The present invention relates to a kind of implementation method that is applicable to the low-power consumption active electronic tag.

Background technology

The patent No. and denomination of invention be respectively US6172609 and " Reader for RFID System " (reader of electronic label identification system) U.S. Patent Publication a kind of technology of electronic label reader.This reader only can be used for passive label, and its shortcoming is that reading efficiency is low, and distance is limited, and the reader emissive power is bigger, existing other equipment is produced disturb easily.

The patent CN1584910A of the People's Republic of China (PRC)---" a kind of reading method of electronic tag " announced a kind of reading technique of active label, but there is following shortcoming in it: 1) label inside does not have good anti-collision mechanism, if just in time be in same channel and time between a plurality of labels, that is to say when appearance is overlapping on the emission sequential, can cause these labels all can't discern; 2) after conflict took place, label also can be fled from conflict situation again without any mechanism.

Summary of the invention

In order to overcome the existing multi-label collision problem of active read-only electronic tag, the present invention proposes the implementation method of a kind of active read-only frequency hopping electronic tags system, its particular content comprises the method for designing that discards tradition, in active electronic label, do not use any CPU or microprocessor, promptly do not control radio circuit work with program by microprocessor, but manage and control the duty of radio circuit by the timer that devices at full hardware realizes, code table at random by one of hardware circuit realization and radio frequency multichannel correspondence, the code table at random that the fixed intervals that produce at timer engraved during according to this on the cycle is selected respective channels to trigger radio circuit and is sent label ID identification information, realized that like this label carries out frequency hopping according to the time and sends signal on different channels, thereby improved the anti-collision performance of active read-only electronic tag greatly, even if also can at once in the ensuing cycle, break away from conflict situation in that conflict has taken place between the label, therefore in the active read-only electronic tag, realized frequency hopping function in mode cheaply, improved the functional reliability of active read-only electronic tag, especially solve the identification certainty under the label high-speed motion state, satisfied the low-cost requirement of active read-only electronic tag.

The present invention's technical scheme that is adopted of dealing with problems is: adopt the active read-only electronic labelling system, reach a fixed time period by the timer that is made of hardware counter is every, replace the work of microprocessor control radio circuit, the channel of radio circuit then according to a hardware at random the random number correspondence that produces of code table choose, the work of radio circuit is the fixedly ID identification information of emission label itself in this moment channel appointed just, this ID sign is just fixedly finished writing when radio circuit is produced in the mode of increasing or decreasing, make the functional reliability of label no longer be limited by the stable constraint of little processing and program like this, realized the frequency hopping communications anti-collision mechanism of no microprocessor in low-cost mode, owing to saved expensive microprocessor and peripheral circuit thereof in the label, make its power consumption and cost all reduce significantly, to reach high reliability, high anti-collision, super low-power consumption and long-life purpose.

The active electronic label system that the present invention realizes is made up of electronic tag and reader, and label comprises power supply, clock, counter, and code table and radio circuit at random, reader comprises power supply, clock, microprocessor, host interface module and radio-frequency module.

Active read-only electronic tag mode of operation among the present invention is as follows:

● under the default situation, electronic tag is in normal off working state a always, only clock, counter operation on the label at this moment, and all the other modules all are in off working state, and power consumption is extremely low;

● rolling counters forward reaches a Fixed Time Interval T1, according to this moment at random the random number t that produces of code table select corresponding radio frequency communications channels, the electronic tag radio circuit is triggered and wake-up, enter communications status b, send tag identifier information (radio circuit emission state, the identification information of each label is fixed, and is produced by radio circuit) from channel appointed, radio-frequency module only is in emission state on the label at this moment, and the time cycle of emission is T2;

● after T2 finished, label was got back to normal off working state a again, and rolling counters forward reaches next Fixed Time Interval T1 by the time, enters next communications status b again according to picked at random channel t;

● the sign ID of different labels adopts the increasing or decreasing mode to be formed by radio circuit, fixing can not the modification in the life cycle of label;

By the microprocessor in the cancellation label, produce a fixed time period by counter, obtaining an accidental channel by code table at random comes regularly to trigger radio circuit and sends constant mark information through this channel, solve the frequency hopping anti-collision communication mechanism of active read-only electronic tag in mode cheaply, improved functional reliability, long service live and the reduction label cost of label greatly.

Description of drawings

Fig. 1 is system's pie graph of a kind of implementation method of active read-only frequency hopping electronic tags.

Fig. 2 is the supervisor status figure of a kind of implementation method of active read-only frequency hopping electronic tags.

1 expression counter adds the timer of code table formation at random among the figure, 2 expression radio circuits, and 3 expression clocks, 4 expression power supplys, 5 expression host interface modules, 6 represent the active read-only electronic tags, 7 expression readers, 8 expression microprocessors; A represents normal inoperative dormant state, and b represents communications status.

Embodiment

6 are in state a under the normal condition;

Rolling counters forward work is to some cycles time T 1, simultaneously according to this moment accidental channel triggering 2 that produces of code table b that gets the hang of at random;

The time span of state b is T2, finishes in the cycle that at T2 the ID label of label is sent task, 6 return state a then after T2 finishes; Reenter the circulation of next round duty.Because the signal send channel of each label carries out random frequency hopping, make label with no microprocessor cheaply mode possessed frequency hopping anticollision characteristics, and can the next cycle after collision break away from and collide the channel operate as normal.

Claims

1. a kind of implementation method of active read-only frequency hopping electronic tags, it is characterized in that: according to the operating characteristic of active electronic label, adopt the bifurcation administrative mechanism, adding at random with counter, the code table channel selector constitutes timer, control the duty and the working channel of radio circuit in order to replace microprocessor, radio circuit only sends the ID identification information of label self when communications status, this identification information fixedly is written in the radio circuit when being production, need not programming Control.Realize the frequency hopping working mechanism of label inside like this with pure hardware mode, set up anti-collision mechanism preferably in mode cheaply, avoid unnecessary system overhead to realize the frequency hopping label function, the danger of the label job insecurity that elimination is brought by microprocessor has reduced power consumption and cost when improving the label functional reliability.