KR101048611B1 - CS-based user location recognition system and method - Google Patents

Abstract

The present invention proposes a position recognition system capable of accurate position recognition in an indoor space such as a workplace of a factory in which obstacles are scattered by utilizing an RF technology based on IEEE 802.15.4a.

Specifically, the user location recognition system according to the present invention, a passport including ID information of the user; A wireless sensor module for transmitting and receiving the user's passport and distance information; A gateway for receiving distance information of the user from the wireless sensor module and transmitting the received information to an externally connected server; And a server for receiving the distance information of the user received from the gateway and providing the current location of the user on a monitor screen.

IEEE802.15.4a, CSS, Geolocation, RF, TCP / IP

Description

CS-based user location recognition system and its method {USER LOCATION RECOGNIZATION SYSTEM BASED ON CHIRP SPREAD SPECTRUM AND METHOD THEREOF}

The present invention relates to a CS (Chirp Spread Spectrum) based location recognition system, which performs more accurate and stable location recognition through a sensor network based on IEEE 802.15.4a CSS, and transmits the recognized information to a server, a mobile terminal (PDA), and a passport. It provides a real-time information service between the work using, and relates to a CSS-based location recognition system that can transmit the emergency situation in the workplace using the two-way transmission and reception of the server and the mobile terminal in the field.

Technology based on location recognition of wireless communication has been widely implemented in various fields such as logistics, social safety, disaster prevention, U-City, etc. In particular, the location recognition service in the factory where the conventional production management system is used was mainly used in the access and security system using the RFID tag (Tag) and the product management system of the production.

RFID is largely classified into tags and readers, which in turn consist of transmitters and receivers / decoders. When the transmitter inside the reader sends out an activation signal, the tag near the reader returns a unique ID assigned to it. The reader reads this and determines which tags are in their vicinity. In general, since the sensing distance that the RFID reader can recognize is within about 2.5m, it can be used as a location recognition system when it is evenly disposed in a limited indoor space.

However, the location recognition using the RFID tag could only be known that the location of the reader of the tag is located, there is a limit in providing a more precise location recognition service. In addition, the location recognition method using the RFID tag has a short sensing distance, so that a plurality of readers are required to provide a precise location recognition service, which has a disadvantage of high initial installation cost.

In addition, in the conventional production management system according to the location recognition, mainly provided a one-way service that allows the administrator of the server to monitor the situation of the workplace through the Zigbee (Zigbee) communication of the sensor. However, this has the disadvantage that it is difficult to directly affect the producers working in the workplace, that is, the workers. The position recognition using Zigbee communication of IEEE 802.15.4 is mainly the position recognition using RSSI (Received Signal Strength Indicator). However, this has a disadvantage in that it reacts sensitively to the radio wave environment and obstacle environment, which makes it difficult to precisely recognize the location.

In addition, a system using GPS or a mobile communication network has a problem that the measurement error is large enough to reach 10m to 1Km and cannot be used in an indoor space.

The present invention has been made based on the above-described problems, and an object thereof is to provide a CSS-based location recognition system capable of accurate location recognition in a short distance or indoors.

In order to achieve the above object, the present invention proposes a position recognition system capable of accurate position recognition in an indoor space such as a workplace of a factory in which obstacles are scattered by utilizing an RF technology based on IEEE 802.15.4a.

Specifically, the user location recognition system according to the present invention, a passport including ID information of the user; A wireless sensor module for transmitting and receiving the user's passport and distance information; A gateway for receiving distance information of the user from the wireless sensor module and transmitting the received information to an externally connected server; And a server for receiving the distance information of the user received from the gateway and providing the current location of the user on a monitor screen. The user location recognition system is based on IEEE 802.15.4a.

In addition, the wireless sensor module, the coordinator module for detecting the user's passport, and informs the ID of the fixed modules located around the detected user's passport; A fixed module installed in a plurality of predetermined areas in a workplace where user location recognition is required, and transmitting distance information with a passport to a user's passport; And a sink module for collecting location information of the user from the coordinator module and transmitting the collected location information to the gateway.

In addition, the user recognition system according to the present invention further comprises a mobile terminal provided to the user side, the mobile terminal is configured to be able to communicate with the server via the gateway via a wireless TCP / IP scheme. The server is configured to transmit corresponding information data to the mobile terminal according to the recognized location of the user, wherein the information data may include any one or more of a work instruction sheet, a history of the plant equipment, and a breakdown of the plant equipment. have.

In addition, a method for recognizing a user's location from an IEEE 802.15.4a CSS-based wireless sensor network according to the present invention includes: searching for a passport including ID information of the user in the wireless sensor network by a coordinator module; If the user passport exists, transmitting IDs of a plurality of fixed modules around the user passport to the passport; Requesting distance information from the fixed module based on the ID of the fixed module received from the passport, and transmitting distance information from the fixed module to the passport; Transmitting distance information received from the fixed module to the coordinator module in the passport; Transmitting the distance information from the coordinator module to the sink module; Transmitting, by the sink module, the distance information to a server located outside the wireless sensor network; And converting, by the server, the distance information based on triangulation and displaying the current location of the user on a monitor.

After recognizing the location of the user, the server may be configured to provide a service corresponding to the current location of the user stored in the server to the mobile terminal provided in advance to the user. The mobile terminal is further configured to communicate with the server via wireless TCP / IP, where the server is configured to transmit corresponding information data to the mobile terminal in accordance with the recognized location of the user. The information data may include any one or more of a work instruction sheet, a history of the plant equipment, and a breakdown of the plant equipment.

According to the present invention, the position recognition using the symmetric double sided two-way ranging (SDS-TWR) mechanism of the IEEE 802.15.4a CSS method is more stable than the method using the received signal strength indicator (RSSI) used in the conventional indoor position recognition. This has the advantage of being possible. In addition, it is possible to implement an extended service than the method using the RFID tag which was mainly used in the production management system.

Accordingly, when the present invention is applied to a workspace such as a factory through a stable position recognition, a service for real-time transmission of information such as employee information, work contents and instructions, history and breakdown of plant equipment, and changed work contents is provided to the user. This leads to increased productivity in the production management system.

In addition, precise location recognition provides safety management of workers by providing services that can transmit information to the server in real time in case of emergency.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a diagram schematically illustrating a CSS-based location recognition system according to the present invention.

As shown in FIG. 1, the CSS-based location recognition system 10 according to the present invention includes a mobile device 120 capable of wireless communication, such as a PDA and a mobile phone, as a user-side device 100, and an ID of a user to be tracked. An RF card or passport 110 is included. In the present invention, the passport 110 is based on the IEEE802.15.4a CSS. The RF sensor using the CSS method of IEEE802.15.4a enables a wide sensing range and precise position tracking.

Next, in order to exchange distance information with the RF passport 110, the CSS-based location recognition system according to the present invention includes a plurality of CSS sensor module 200, as shown in Figure 1, CSS sensor module 200 Includes a sink module 210, a coordinator module 220, and a fixed module 230.

The sink module 210 transmits a packet notifying the start of wireless sensor networking to the coordinator module 220 capable of transmitting and receiving in one hop in a wireless sensor network including the RF passport 110 and the CSS sensor module 200. On the other hand, it operates to receive and collect the distance information of the user to be described later from the coordinator module 220.

The coordinator module 220 is installed in a workplace or the like requiring location recognition, and detects whether the RF card or the passport 110 exists in a predetermined area, more specifically, within a sensor sensing distance of the coordinator module 220.

In addition, the fixed module 230 is installed in a plurality of predetermined areas, such as a workplace that requires user location recognition to recognize the distance information with the passport 110, the passport 110 transmits this distance information to the coordinator module 220. . The coordinator module 220 transmits the distance information received from the passport to the sink module 210, and the sink module 210 collects the distance information of the passport received from the coordinator module 220.

The gateway 300 operates to receive the distance information collected from the sink module 210. The gateway 300 and the sink module 210 are implemented by RS232 serial communication, and the sink module 210 receives The distance information is transmitted to the server 400 through the gateway 300, and preferably includes a wireless hub supporting wireless TCP / IP communication for wireless communication with the user mobile device such as the PDA.

Thereafter, the distance information is transmitted to the server 400 through the gateway 300 in a wireless TCP / IP manner, and the server 400 uses the triangulation method to determine the current location of the user using the distance information transmitted from the gateway 300. It will calculate and display it on the monitor.

In addition, after the user's location is recognized, the server 400 is configured to provide a work instruction related to the current location of the user, a resume of the factory facility, or a breakdown record of the factory facility through the user's mobile device.

Next, an example of implementing the CSS-based location recognition system of the present invention in a workplace such as a factory will be described with reference to FIG. 2.

First, as illustrated in FIG. 2, the workplace is divided into a plurality of zones A to D. The width of each zone is preferably such that the coordinator module can recognize the RF passport 110.

First, the sink module 210 installed in one place of the workplace transmits a packet notifying the start of sensor networking to the coordinator 220a or 220b capable of transmitting and receiving in one hop.

Assuming that the coordinator receiving the packet from the sink module 210 is 220a, the coordinator 220a receiving the packet from the sink module 210 transmits the packet to the next coordinator capable of transmitting / receiving in one hop to all coordinators 220a to 220d. ) To receive the packet, and the coordinators 220a to 220d receiving the packet check whether the passport 110 exists in their zone.

When the passport 110 is present in the zone, each coordinator 220a-220d sends four fixed node IDs located in the responsible zone A-D to the passport 110, and the passport 110 transmits from the coordinator. The distance information with the fixed nodes is transmitted and received, and the distance information to the coordinator is transmitted together with the ID of the passport 110. The coordinator again transmits the distance information packet of the passport to the sink module 210 via the coordinator in the reverse direction.

For example, if the worker is in zone D, the coordinator module 220d detects the RF signal from the worker's passport 110 to detect that the worker is currently in zone D, and the coordinator module 220d operates The ID of the fixation module 230d1 to 230d3 located in the zone D and the fixation module 230cen located at the center of the workplace is notified to the RF passport 110 of the user, and the RF passport 110 of the user is provided with the received fixation modules ( After communicating with the corresponding fixed modules using IDs of 230d1 to 230d3 and 230cen to receive distance information from the RF passport 110 to the respective fixed modules 230d1 to 230d3 and 230cen, ID and distance information of the fixed modules are transmitted to the coordinator module 220d.

The coordinator module 220d transmits the ID and distance information of the received passport 110 to the sink module 210.

The sink module 210 transmits the received distance information packet to the gateway 300 through RS232 serial communication. The sink module 210 transmits the received distance information packet to the server through the WLAN network.

CSS-based location recognition of the present invention uses a ranging technique based on the transmission and reception of distance information. The mechanism used is SDS-TWR, and is a method of converting distance information using a transmission / reception time difference between two nodes. . This is a method of performing the conventional CSS-based two-way ranging (TWR) mechanism once more, and has an advantage that the accuracy of the distance measurement is very high.

The server 400 converts the distance information between the user's passport 110 and the fixed modules transmitted from the gateway 300 into location information by using triangulation, and converts the current location of the user on the screen of the system manager. It outputs and instructs a command such as a work instruction from a database storing information according to a location.

3 is a flowchart illustrating an example of controlling a work procedure of a server administrator and a worker whose location is recognized after installing the CSS-based location recognition system according to the present invention.

As shown in FIG. 3, after the location of the worker or the user is monitored from the server 400, the administrator transmits a pre-written job, a job change instruction, and the like to the mobile device 120 such as the PDA of the user.

The worker may receive a work order and the like through the mobile device 120 to handle the work according to the work content, and transmit the troubles and the emergency of the work to the manager.

If it is determined that the emergency situation, the action according to the emergency situation is to be processed, the work is completed from the worker can be returned to the work instruction can be input and processing of the work results.

In addition, when the worker 400 reaches a specific location in the workplace, that is, when the location of the worker is detected within a specific coordinate, the server 400 moves instructions to be processed in the corresponding area of the user's PDA. When configured to transmit to the device 120 can improve work efficiency of work. In addition, when a failure or a problem is found in a specific location of the workplace, it is preferable to call the worker closest to a specific location among the location-recognized workers to check it, or the server and the mobile device may be configured to allow bidirectional communication with each other. .

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not for limiting the technical spirit of the present invention but for the description, and the scope of the technical idea of the present invention is not limited by these embodiments.

Therefore, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be construed as being included in the scope of the present invention.

1 is a view showing a schematic configuration of a CSS-based location recognition system according to the present invention.

2 is a diagram showing an example of the actual installation of the CSS-based location recognition system according to the present invention in the workplace.

3 is a flowchart illustrating an example of the flow of work tasks after installing the CSS-based location recognition system in the workplace according to the present invention.

Claims (13)

In the user location recognition system, A passport including ID information of the user; A wireless sensor module for transmitting and receiving distance information to the passport of the user; A gateway for receiving distance information of the user from the wireless sensor module and transmitting the received information to an externally connected server; And A server for receiving the distance information of the user received from the gateway and providing the current location of the user on a monitor screen; The wireless sensor module, A coordinator module for detecting a passport of the user and informing the IDs of the fixed modules located around the detected passport of the user; A fixed module installed in a plurality of predetermined areas in a workplace where user location recognition is required, and transmitting distance information with a passport to a user's passport; And And a sink module for collecting location information of the user from the coordinator module and transmitting the location information to the gateway. The method of claim 1, The user location recognition system is based on IEEE 802.15.4a. delete The method of claim 1, Further comprising a mobile terminal provided on the user side, And the mobile terminal is capable of communicating with the server via the gateway via a wireless TCP / IP scheme. 5. The method of claim 4, And the server is configured to transmit corresponding information data to the mobile terminal according to the recognized location of the user. The method of claim 1, And the sink module is connected to the gateway via RS232 serial communication. The method of claim 5, And the information data includes any one or more of a work instruction sheet, a history of the plant equipment, and a breakdown of the plant equipment. A method for recognizing a user's location from an IEEE 802.15.4a CSS-based wireless sensor network, Searching for a passport including ID information of a user in the wireless sensor network by a coordinator module; If the user passport exists, transmitting IDs of a plurality of fixed modules around the user passport to the passport; Requesting distance information from the fixed module to the user's passport based on the ID of the fixed module received at the passport, and transmitting distance information from the fixed module to the passport; Transmitting distance information received from the fixed module to the coordinator module in the passport; Transmitting the distance information from the coordinator module to the sink module; Transmitting, by the sink module, the distance information to a server located outside the wireless sensor network; And Converting, by the server, the distance information based on triangulation and displaying a current location of a user on a monitor; And wherein said information data comprises at least one of a work order, a history of a factory facility, and a history of a failure of a factory facility. The method of claim 8, After the server recognizes the location of the user, further comprising providing a service corresponding to the current location of the user stored in the server to a mobile terminal provided to the user in advance. A method for recognizing a user's location from the network. 10. The method of claim 9, And the mobile terminal communicates with the server via wireless TCP / IP. The method of claim 10, And the server is configured to transmit corresponding information data to the mobile terminal according to the recognized location of the user. delete In the IEEE 802.15.4a CSS-based user location recognition system comprising a CSS-based passport including ID information of the user and a plurality of CSS-based wireless sensor module for transmitting and receiving the distance information to the user's passport, The distance information between the CSS-based passport and the plurality of CSS-based wireless sensor modules is transmitted to a server by a wireless TCP / IP method, the server collects the distance information into coordinate information by triangulation, and the collected coordinate information. IEEE 802.15.4a CSS-based user location recognition system, characterized in that configured to display on the display screen.

Images