CN214429716U

CN214429716U - RTLS real-time positioning system based on ZigBee technology

Info

Publication number: CN214429716U
Application number: CN202120442882.2U
Authority: CN
Inventors: 钟石云; 俞海滨
Original assignee: Hangzhou Shengjia Intelligent Technology Co ltd
Current assignee: Hangzhou Shengjia Intelligent Technology Co ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-10-19
Anticipated expiration: 2031-03-01

Abstract

The utility model relates to a RTLS real-time positioning system based on ZigBee technology, which comprises a plurality of ZigBee tags, a plurality of ZigBee routers, a ZigBee coordinator, a gateway and a cloud processor; the ZigBee tag is installed on an article to be positioned, a dynamic address is distributed by the ZigBee coordinator, and the dynamic address is associated with the unique MAC address of the ZigBee router; the ZigBee router is connected with the terminal equipment and the ZigBee coordinator, the ZigBee coordinator is connected with the ZigBee router and the gateway, and the approaching or the leaving of the ZigBee tag to the ZigBee coordinator is identified through the received signal strength indicator RSSI from the ZigBee tag; the ZigBee tag sends signals, the signals are collected to the ZigBee coordinator through the ZigBee router, and then the signals are sent to the cloud processor through the gateway.

Description

RTLS real-time positioning system based on ZigBee technology

Technical Field

The utility model relates to an indoor positioning technique especially relates to a RTLS real-time positioning system based on zigBee technique.

Background

When positioning navigation is carried out, GPS is firstly thought, and a Beidou satellite positioning system of the satellite positioning system is also provided in China. However, satellite positioning can only be used in outdoor environments, and once indoors, satellite positioning cannot be used due to the fact that the navigation signals are attenuated too fast.

Along with the rapid change of times, scientific technology develops rapidly, the quality and efficiency of information service are improved, the interference degree is low, and the method plays a very important role in life work and scientific research of people. The indoor positioning technology is very practical, has a large expansion space, is wide in application range, and can realize quick positioning of people and articles in complex environments such as libraries, gymnasiums, underground garages, goods warehouses and the like.

The ZigBee indoor positioning technology forms networking between a plurality of blind nodes to be positioned and a reference node with a known position and a gateway, and all tiny blind nodes coordinate and communicate with each other to realize total positioning. ZigBee is an emerging short-distance and low-speed wireless network technology, the sensors only need little energy, data are transmitted from one node to another node through radio waves in a relay mode, the ZigBee is used as a communication system with low power consumption and low cost, and the ZigBee has very high working efficiency.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a high accuracy RTLS real-time positioning system that can be used to indoor location based on zigBee technique.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an RTLS real-time positioning system based on ZigBee technology comprises a plurality of ZigBee tags, a plurality of ZigBee routers, a ZigBee coordinator, a gateway and a cloud processor; the ZigBee tag is installed on an article to be positioned, the ZigBee tag is used as an RFID tag, a dynamic address is distributed by the ZigBee coordinator, and the dynamic address is associated with the unique MAC address of the ZigBee router;

the ZigBee router is connected with the terminal equipment and the ZigBee coordinator, the ZigBee coordinator is connected with the ZigBee router and the gateway and is used as a reader of the RFID label, and the approaching or the leaving of the ZigBee label to the ZigBee coordinator is identified through the received signal strength indication RSSI from the ZigBee label;

the ZigBee tag sends signals, the signals are collected to the ZigBee coordinator through the ZigBee router, and then the signals are sent to the cloud processor through the gateway.

Preferably, the ZigBee tag adopts an RSSI node received signal strength technology.

Preferably, the ZigBee coordinator comprises an RFID module, a carrier generator responsible for generating forward link modulation signals and receiving RFID tag load modulation signals, a power amplifier for generating RF power at a suitable and possibly variable power level, impedance matching to ensure maximum overall power transfer, a detection and filtering component for extracting and separating load modulated subcarrier signals from carrier and other noise; the RFID antenna is arranged between the impedance matching, detecting and filtering assembly, and a signal sent by the RFID module is transmitted to the carrier generator after being modulated.

Preferably, the RFID module integrates a microprocessor and an RFID chip.

Preferably, the RFID module is also separately connected with a security access module.

Compared with the prior art, the beneficial effects of the utility model are that: the ZigBee technology is included in the IEEE 802.15.4 standard of a Personal Area Network (PAN), is a bidirectional short-range wireless communication technology, and has: the system has the advantages of low complexity, low power consumption, low power, low cost, rapidness, safety and reliability, supports a large number of nodes on the network, has strong anti-interference performance, can determine the relation among the nodes by searching communication objects again when a certain node is damaged, has strong self-networking (self-repairing) capability, and is very suitable for real-time positioning in a closed building. The system has immeasurable huge potential in the fields of logistics management, intelligent old age, commercial information collection, fire emergency and the like.

Drawings

Fig. 1 is a schematic diagram of the operation of the intelligent shelf system.

Fig. 2 is a schematic structural diagram of the ZigBee coordinator 3.

Fig. 3 is another structural schematic diagram of the ZigBee coordinator 3.

Detailed Description

The following describes in detail an embodiment of the present invention with reference to the drawings.

Example 1:

fig. 1 shows an intelligent shelf system, which is essentially an RTLS real-time positioning system based on ZigBee technology. Each layer of the goods shelf 7 is provided with a plurality of goods 6, each goods 6 is provided with a ZigBee tag 1 (namely, the ZigBee tag 1 is used as an RFID tag), and the goods shelf 7 is also provided with a plurality of ZigBee routers 2. The intelligent shelf system comprises a plurality of groups of shelves 7 provided with ZigBee tags 1 and ZigBee routers 2, ZigBee coordinators 3, switches 4 and a cloud processor 5. The ZigBee tag 1 is assigned a dynamic address by the ZigBee coordinator 3 and associates the dynamic address with a MAC address unique to the ZigBee router 2. The ZigBee tag 1 adopts an RSSI node received signal strength technology. The ZigBee router 2 is connected with the terminal equipment and the ZigBee coordinator 3. The ZigBee coordinator 3 is connected to the ZigBee router 2 and the gateway 4, and the ZigBee coordinator 3 is used as a reader of the RFID tag. The approach or departure of the ZigBee tag 1 to the ZigBee coordinator 3 is identified by the received signal strength indication RSSI from the ZigBee tag 1.

The overall process is as follows: the ZigBee tag 1 sends signals, the signals are collected to the ZigBee coordinator 3 through the ZigBee router 2, and then the signals are sent to the cloud processor 5 through the gateway 4.

The system comprises a backhaul mechanism for storing RSSI and parent-child pairing information, and the information is pushed to a cloud end through a gateway. The cloud processing uses SaaS (software) for post-processing the acquired data, so as to achieve the optimal positioning accuracy of the system. The goods in the goods shelf are placed in different directions, so that the RSSI values obtained by the system are different, a large database for accurately positioning the placed goods can be constructed, and the accurate position of each placed goods can be obtained by using machine learning, regression and average methods.

The ZigBee technology is included in the IEEE 802.15.4 standard of a Personal Area Network (PAN), is a bidirectional short-range wireless communication technology, and has: the system has the advantages of low complexity, low power consumption, low power, low cost, rapidness, safety and reliability, supports a large number of nodes on the network, has strong anti-interference performance, can determine the relation among the nodes by searching communication objects again when a certain node is damaged, has strong self-networking (self-repairing) capability, and is very suitable for real-time positioning in a closed building. The system has immeasurable huge potential in the fields of logistics management, intelligent old age, commercial information collection, fire emergency and the like.

Fig. 2 shows the ZigBee coordinator 3 as the approval part of the system. The ZigBee coordinator 3 comprises an RFID module 31, a carrier generator 32, a power amplifier 33, an impedance match 34, a detection and filtering component 35. The RFID module 31 integrates a microprocessor and an RFID chip. The carrier generator 32 is responsible for generating the forward link modulation signal and receiving the RFID tag load modulation signal. The power amplifier 33 is used to generate RF power at a suitable and possibly variable power level. Impedance matching 34 is used to ensure maximum overall power transfer. The detection and filtering component 35 is used to extract the load modulated subcarrier signal and separate it from the carrier and other noise. The carrier generator 32 is connected with an external power supply, the carrier generator 32 is sequentially connected with the power amplifier 33, the impedance matching 34, the detection and filtering assembly 35 and the RFID module 31, the RFID antenna 36 is arranged between the impedance matching 34 and the detection and filtering assembly 35, and signals sent by the RFID module 31 are transmitted to the carrier generator 32 after being modulated.

In FIG. 1, 3 external ports are shown, including an external power port 37, a network port 38, and an RFID antenna 36. The network port can be connected with the gateway through a wireless transmission mode or can be connected with the gateway through a wire.

In some cases, it is necessary that the ZigBee coordinator can handle multiple protocols. For example: ISO14443 and ISO 15693. ISO15693 is a neighborhood-based RFID standard for longer range, lower data rate neighborhood transactions. Therefore, it is desirable to set RFID antenna 36 to a higher level to achieve higher resonance and longer tag interaction distance. On the other hand, ISO14443 applies an RFID protocol with higher data rate and shorter read distance. Compared with ISO15693, ISO14443 has better safety performance. The ISO15693 credentials may communicate using ISO14443 associated lower RFID antennas 36. Both standards use a common carrier frequency: 13.56 mhz. A disadvantage of this approach is that the read range of the RFID solution of the ISO15693 protocol will be shortened compared to other approaches. However a multi-protocol ZigBee coordinator capable of handling both protocols may be made possible. To achieve this, a security access module 30 as shown in fig. 2 needs to be added to the architecture of fig. 1. This module is able to handle the encryption keys and algorithms associated with the security features typically included in the RFID technology of the ISO14443 protocol.

The above description in this specification is merely illustrative of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a RTLS real-time positioning system based on zigBee technique which characterized in that: the ZigBee wireless sensor network system comprises a plurality of ZigBee tags (1), a plurality of ZigBee routers (2), a ZigBee coordinator (3), a gateway (4) and a cloud processor (5); the ZigBee tag (1) is installed on an article needing to be positioned, the ZigBee tag (1) is used as an RFID tag, a dynamic address is allocated by the ZigBee coordinator (3), and the dynamic address is associated with a unique MAC address of the ZigBee router (2);

the ZigBee router (2) is connected with a terminal device and a ZigBee coordinator (3), the ZigBee coordinator (3) is connected with the ZigBee router (2) and a gateway (4), the ZigBee coordinator (3) is used as a reader of an RFID tag, and the ZigBee tag (1) is used for identifying the approaching or leaving of the ZigBee coordinator (3) by the ZigBee tag (1) through the received signal strength indicator RSSI from the ZigBee tag (1);

the ZigBee tag (1) sends signals, the signals are collected to the ZigBee coordinator (3) through the ZigBee router (2), and then the signals are sent to the cloud processor (5) through the gateway (4).

2. The RTLS real-time positioning system based on ZigBee technology as claimed in claim 1, wherein: the ZigBee tag (1) adopts an RSSI node received signal strength technology.

3. An RTLS real-time positioning system based on ZigBee technology as claimed in claim 1 or 2, wherein: the ZigBee coordinator (3) comprises an RFID module (31), a carrier generator (32) responsible for generating forward link modulation signals and receiving RFID tag load modulation signals, a power amplifier (33) for generating RF power at a suitable and possibly variable power level, an impedance match (34) to ensure maximum overall power transfer, a detection and filtering component (35) for extracting load modulated subcarrier signals and separating them from carrier and other noise; the portable radio frequency identification device is characterized in that the carrier wave generator (32) is connected with an external power supply, the carrier wave generator (32) is sequentially connected with the power amplifier (33), the impedance matching (34), the detection and filtering component (35) and the RFID module (31), an RFID antenna (36) is arranged between the impedance matching (34) and the detection and filtering component (35), and signals sent by the RFID module (31) are transmitted to the carrier wave generator (32) after being modulated.

4. The RTLS real-time positioning system based on ZigBee technology as claimed in claim 3, wherein: the RFID module (31) integrates a microprocessor and an RFID chip.

5. The RTLS real-time positioning system based on ZigBee technology as claimed in claim 3, wherein: the RFID module (31) is also separately connected with a security access module (30).