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1. Background
The safe production of underground tunnel work has attracted great attention from all walks of life. The establishment of a reliable and practical personnel real-time positioning system improves the monitoring and dispatch level of tunnel personnel, and enhances the rapid response ability of tunnel personnel in the event of an accident. This has very important practical and social significance. .
2. Overview of UWB personnel real-time positioning system
First of all, a certain number of positioning base stations need to be placed in the tunnel according to the area and lanes tracked by people according to the actual situation of the site to ensure that people within the network coverage can accurately locate and communicate. Then wear a personnel positioning card for the personnel who need to track and locate personnel. When the tunnel personnel enter the tunnel, as long as they are within the coverage of the tunnel network at any time, the positioning base station can sense the signal and upload it to the ground server. After software processing, each specific information (such as: personnel ID, location, specific time) can be obtained, and it can be dynamically displayed (real-time) on the large screen or computer of the monitoring center and backed up. The management personnel can know the status of the tunnel personnel at any time.
In the event of an emergency in the tunnel, the tunnel personnel can issue an alarm through the locating card they carry. Tunnel personnel only need to press the alarm button on the positioning card to give an alarm. The dynamic display interface in the monitoring room will immediately pop up a red alarm signal. The positioning card carried by the tunnel personnel can also receive information. Once a dangerous situation occurs, the dispatching room can send an alarm signal to all tunnel personnel, providing an important prerequisite for the tunnel personnel to escape in the first time.
Managers can watch the tunnel personnel and equipment activities on the big screen or computer at any time, and can view the information status of any area, any team/part/individual, and can print reports and query historical data, which brings great management to management. The convenience.
Three, UWB personnel real-time positioning system components
The whole system consists of three parts: positioning tag, AP locator and positioning server software.
Location label: with button alarm and low battery alarm function, IEEE802.11b international standard anti-collision protocol, with USB charging port.
AP locator: In addition to the ordinary AP function, it also supports positioning and identification functions. It can identify more than 200 tags in one second, and the identification distance is more than 500 meters.
Locate the server. The main function:
1) Electronic map: The electronic map shows the distribution of personnel, alarm status, and sensor parameters;
2) Real-time alarm: emergency button alarm, dangerous area alarm, low power alarm, disappear alarm, etc.;
3) Report statistics: real-time statistics on the number of personnel in the area, entry and exit time, stay time, etc.;
4) Historical track playback: used to query and analyze personnel track records;
5) Supporting data interface can seamlessly access the existing tunnel personnel system;
6) A single positioning engine can calculate 2000 positions at the same time within 1 second, and can locate tens of thousands of targets.
4. Features of UWB personnel real-time positioning system
Full signal coverage
The tunnel personnel positioning system can achieve continuous signal coverage for various complex terrains such as shafts, inclined shafts, straight roads, and working faces, and truly realize no blind areas for signals.
High-precision positioning
The tunnel personnel positioning system uses advanced 2.4GHz radio frequency identification technology to achieve high-precision personnel positioning in complex environments, with a positioning accuracy of 2 meters.
High recognition rate and recognition stability
The tunnel personnel positioning system has a front-end recognition rate of 100%, with a bit error rate of less than one hundred thousandths, truly achieving no bit errors and no missing cards.
Simple and convenient operation
Directly import the original CAD drawings of the tunnel underground, simple operation, no need to redraw the mining area map; ensure that the displayed graphics are consistent with the original drawings of the customer. The software has a good operation interface. The identification card has a built-in battery, ultra-low power consumption, no external miner’s lamp power supply, and a standby time of up to 3 months.
Rich query and report functions
The query and report output and printing functions are simple and easy to operate; it can query the attendance information of all employees; realize the track playback; can output various information reports as required (such as: entry tunnel time report, personal attendance daily report, personal attendance monthly report, etc. ).
5. UWB personnel real-time positioning system function
Attendance statistics and report query: including total number of tunnel personnel, downhole time, number of times, area stay time, daily attendance report, etc.;
Tracking and positioning: including area positioning, ±2m high-precision positioning, tracking, personnel movement routes, etc.;
Two-way paging: including wireless paging to the tunnel personnel and wireless calling for help from the tunnel personnel to the ground;
Networked personnel information management: tunnel personnel information is transmitted in real time, and can be shared by multiple departments and levels.
Management of key areas and restricted areas: Authority management of important areas and restricted areas, unauthorized personnel entering, the system automatically alarms.
Six, summary
The application of radio frequency card identification technology to the tunnel underground personnel management system is to establish a complete, flexible and real-time tunnel underground personnel management system, including the planning and arrangement of underground tunnel workers, the authority management of workers entering and exiting the tunnel, the distribution of tunnel personnel, and the operation The management of worker information, safe material flow, etc., to realize the informationization of tunnel management, and at the same time improve the level of tunnel mining production management and operation safety. This intelligent monitoring system is based on mine safety production, radio frequency identification module (RFID) is the main equipment, wired communication network is the link, and the PC of the supervision center is a new type of intelligent computer management system. It comprehensively uses a variety of communications. The technology has broken through the traditional tunnel safety management mode and is a new trend in the tunnel safety production management system.
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