CN110210268A

CN110210268A - RFID high-precision location technique based on LANDMARC algorithm

Info

Publication number: CN110210268A
Application number: CN201910484090.9A
Authority: CN
Inventors: 王胜
Original assignee: Beijing Jingtou Xinan Science And Technology Development Co Ltd
Current assignee: Beijing Jingtou Xinan Science And Technology Development Co Ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2019-09-06

Abstract

The invention belongs to the field of locating technology of ultrahigh frequency RFID more particularly to a kind of RFID high-precision location techniques based on LANDMARC algorithm.A kind of RFID high-precision location technique based on LANDMARC algorithm, introduce the timesharing handoff technique of same card reader multichannel antenna: single card reader, multichannel antenna, greatly reduces the cost of card reader, while greatly reducing the power consumption of system and the complexity of engineering construction；Introduce same card reader, the Time synchronization technique of multichannel antenna: single card reader, multichannel technology provide the unified reference clock of system, to obtain the mutual time delay between the time delay in channel itself and multichannel, and calculate in turn from Delay accurately away from from information.

Description

RFID high-precision location technique based on LANDMARC algorithm

Technical field

The invention belongs to the field of locating technology of ultrahigh frequency RFID more particularly to a kind of RFID based on LANDMARC algorithm High-precision location technique.

Background technique

Radio frequency identification (Radio Frequency Identification, RFID) is a kind of to be known automatically using radiofrequency signal Other target object and the technology for obtaining relevant information.RFID system is with data volume is big, confidentiality is high, strong antijamming capability, knowledge The advantages that the advantages that other time is short, expense is lower, the non-contact and non line of sight of RFID technique, becomes preferred indoor positioning Technology, in terms of such as vehicle location, storehouse management, logistic track, personal entertainment and mobile office and unit personnel There is good application prospect.

LANDMARC location algorithm is proposed by LIONELM.NI within 2004 based on RSSI.LANDMARC algorithm it is basic Principle is as follows:

1. n Reader is arranged, and region to be measured is modeled, while being arranged k with reference to tag；

2. determining n Reader with k with reference at a distance from tag；

3. tag admission to be measured, n Reader read the signal strength of tag to be measured, and calculate Euclidean distance；

4. acquiring the coordinate of tag to be measured according to centroid algorithm.

LANDMARC algorithm is a kind of algorithm of value based on RSSI id signal intensity.RSSI value is provided by radio frequency chip, And distance is judged according to the value of RSSI.RSSI value shows that more greatly tag distances reader is closer, and RSSI value is smaller, shows label It is remoter apart from reader.But LANDMARC algorithm requires the card reader placed multiple test tag, require more non-temporal synchronizations, This greatly improves the cost of positioning, precision and implementation complexity, it is therefore desirable to redesign a kind of algorithm of optimization, simultaneously Meet the requirement of low cost, high-precision and low enforcement difficulty.

Summary of the invention

The object of the present invention is to provide a kind of RFID high-precision location techniques based on LANDMARC algorithm, and realizing reduces The cost of RFID card reader, while meeting the requirement of high-precision and low enforcement difficulty.

In order to achieve the above objectives, the present invention uses following technological means:

A kind of RFID high-precision location technique based on LANDMARC algorithm, introduces same card reader multichannel antenna Timesharing handoff technique: single card reader, multichannel antenna greatly reduce the cost of card reader, while greatly reducing system The complexity of power consumption and engineering construction；Same card reader is introduced, the Time synchronization technique of multichannel antenna: single card reader is more Passage technology provides the unified reference clock of system, thus when obtaining mutual between the time delay in channel itself and multichannel Prolong, and calculates accurate range information from Delay in turn.

A kind of RFID high-precision location technique based on LANDMARC algorithm, specifically includes the following steps:

Step 1: (quantity of n is 4,8 or 16 to the RFID Reader in setting n channel of one hyperfrequency, the bigger essence of n value Spend higher), and the time delay of n-channel antenna itself is modeled；The time delay of N channel antenna itself is respectively as follows: t1, t2, t3...tn；

Step 2: the n-th channel of RFID Reader sends wireless signal, other n- under same clock, by time slot respectively Time delay value is collected in 1 channel respectively, obtains the distance value of n channel antenna from each other by time delay value；

Step 3: the n-channel of RFID Reader is under same clock, send wireless signal respectively by time slot, and read to The time delay value that tag is returned is positioned, distance value is obtained by time delay value:

Step 4: calculating separately the distance of test tag and n channel antenna by time delay value

Step 5: it is flat that the reference distance of each n channel antenna of above formula and tag to be positioned is done weighting according to centroid algorithm , the coordinate of tag to be positioned is acquired.

The positive effect of the present invention is: a kind of RFID high-precision location technique based on LANDMARC algorithm, introduces same One card reader, the technology of multichannel antenna greatly reduce the hardware cost and power consumption of card reader；The time of multichannel antenna is same Step technology substantially increases the accuracy of acquisition range information, and then improves the precision of positioning.

Detailed description of the invention

Fig. 1 is the system diagram of the ultrahigh frequency RFID of 8 channel list card reader；

Fig. 2 is the Time synchronization technique figure of multichannel antenna；

Specific embodiment

The embodiment of the present invention is illustrated with reference to the accompanying drawing.

A kind of RFID high-precision location technique based on LANDMARC algorithm, introduces same card reader multichannel antenna Timesharing handoff technique and Time synchronization technique, specifically includes the following steps:

Step 1: the RFID Reader in setting one hyperfrequency, 8 channels, and the time delay of 8 channel antennas itself is carried out Modeling；The time delay of 8 channel antennas itself is respectively as follows: t1, t2, t3, t4, t5, t6, t7, t8；

Step 2: the 8th channel of RFID Reader is under same clock, wireless signal is sent respectively by time slot, other 7 Time delay value is collected in a channel respectively, obtains the distance value of 8 channel antennas from each other by time delay value；

Step 3: 8 channels of RFID Reader are under same clock, send wireless signal respectively by time slot, and read to The time delay value that tag is returned is positioned, distance value is obtained by time delay value:

Step 4: calculating separately the distance of tag and 8 channel antenna of test by time delay value

RFID high-precision location technique based on LANDMARC algorithm, introduces same card reader, the technology of multichannel antenna, The hardware cost and power consumption of card reader are greatly reduced, cost and power consumption are only the 1/8 of traditional scheme；The time of multichannel antenna Simultaneous techniques substantially increases the accuracy of acquisition range information, and then improves the precision of positioning.

It is above-described to be merely a preferred embodiment of the present invention, it should be understood that the explanation of above embodiments is only used In facilitating the understanding of the method and its core concept of the invention, it is not intended to limit the scope of protection of the present invention, it is all of the invention Any modification for being made within thought and principle, equivalent replacement etc., should all be included in the protection scope of the present invention.

Claims

1. a kind of RFID high-precision location technique based on LANDMARC algorithm, it is characterised in that based on LANDMARC algorithm RFID high-precision location technique introduces the timesharing handoff technique and Time synchronization technique of same card reader multichannel antenna, specifically The following steps are included:

Step 1: (quantity of n is 4,8 or 16 to the RFID Reader in setting n channel of one hyperfrequency, and the bigger precision of n value is more It is high), and the time delay of n-channel antenna itself is modeled；The time delay of N channel antenna itself is respectively as follows: t1, t2, t3 ... tn；

Step 2: the n-th channel of RFID Reader sends wireless signal under same clock, by time slot respectively, other n-1 are a Time delay value is collected in channel respectively, obtains the distance value of n channel antenna from each other by time delay value；

Step 3: the n-channel of RFID Reader sends wireless signal under same clock, by time slot respectively, and read to be positioned The time delay value that tag is returned obtains distance value by time delay value:

Step 5: the reference distance of each n channel antenna of above formula and tag to be positioned is weighted and averaged, is asked according to centroid algorithm Obtain the coordinate of tag to be positioned.

2. a kind of RFID high-precision location technique based on LANDMARC algorithm according to claim 1, it is characterised in that: RFID high-precision location technique based on LANDMARC algorithm specifically includes the following steps:

Step 1: the RFID Reader in setting one hyperfrequency, 8 channels, and the time delay of 8 channel antennas itself is built Mould；The time delay of 8 channel antennas itself is respectively as follows: t1, t2, t3, t4, t5, t6, t7, t8；

Step 2: the 8th channel of RFID Reader sends wireless signal under same clock, by time slot respectively, other 7 logical Time delay value is collected in road respectively, obtains the distance value of 8 channel antennas from each other by time delay value；

Step 3: 8 channels of RFID Reader send wireless signal under same clock, by time slot respectively, and read to be positioned The time delay value that tag is returned obtains distance value by time delay value: