System characteristics of the underground personnel positioning system

Tunnel is a high-risk engineering industry, many people will consider whether personal safety is guaranteed when talking about tunnel safety accidents, and the control of construction safety is the key to ensuring the personal safety of tunnel construction personnel. The traditional tunnel construction safety control method focuses on the rules and regulations of tunnel construction management, and there are more practical protective equipment that can be worn. However, the effectiveness and practicability of this safety control method are very poor, especially in the development of risk early warning, post-event rescue, etc., and there is almost no effect.

1. Tunnel and highway construction sites, there are the following problems in management:

1. In the face of long highway construction lines, management personnel cannot grasp the location of construction personnel;

2. The attendance of open construction site personnel cannot be well managed;

3. The long and narrow tunnel and the complex construction environment make it impossible for the management personnel to ensure the safety of the construction personnel.

In order to solve the above problems, an intelligent management system based on location information services can be used: tunnel personnel positioning management system. Provide one-stop service for the construction site to effectively solve the above problems.

2. Introduction to tunnel personnel positioning system.

The tunnel personnel positioning system solves the situation that the tunnel encounters an accident, lacks reliable location information and voice communication means for the rescue of construction personnel, and has low efficiency in emergency rescue and disaster relief and safety rescue. Due to the poor communication network, the single mode of communication, and the poor ability of the network to bear the network, it often leads to the lack of early communication of information by the leadership, insufficient command, and inaccurate figures, which is not conducive to accident rescue, and is very easy to cause the expansion of accident losses. The tunnel personnel positioning system uses the corresponding personnel tracking and positioning equipment to carry out real-time automatic tracking and attendance of construction personnel around the clock, and grasps the location and activity trajectory of each employee in the tunnel at any time.

During the construction process, when employees encounter an emergency, they can press the distress button on the positioning card, and the system will automatically alarm, and the management department will grasp the on-site situation at the first time and send rescuers to emergency rescue in time.

Third, the principle of the system.

On the basis of ultra-low power Bluetooth technology, a Bluetooth positioning algorithm with accurate positioning and ultra-low power consumption was designed by integrating a variety of filtering algorithms and rejection algorithms.

Using Bluetooth positioning technology, multiple wireless Bluetooth beacons are installed in the field to broadcast Bluetooth signals at regular intervals. The locator worn by a person or item receives the wireless signal broadcast by the Bluetooth beacon in real time, and judges the signal strength (RSSI), which converts the signal strength into the distance between the Bluetooth beacon and the locator, and then determines the position of the locator according to the geometric relationship between the device and the node.

Fourth, system functions.

Real-time positioning: visually view the location of various types of personnel (different types of workers, visitors, etc.).

Historical trajectory: The movement trajectory of personnel in a specified time period can be played back to provide a decision-making basis for time processing.

Out-of-bounds alarm: When a person enters an area outside their authority, an alarm is given.

Static alarm: When the personnel are in a stationary state for more than a certain time, an alarm will be given. Timely treatment of personnel in coma and other situations.

Data statistics: Statistics of the total number of people in real-time and the total number of people in historical periods (including personnel information) in each work area.

Real-time location display: real-time positioning of underground personnel location information and distribution through the personnel positioning system, real-time monitoring of personnel trajectory.

Real-time location display.

Statistics on the number of underground personnel: real-time statistics on the number of underground personnel, when encountering a serious accident, you can quickly gather employees for roll call statistics, and confirm that the real-time location of employees has not arrived, implement rescue, and avoid personnel.

Abnormal emergency alarm: In the event of an emergency, the management personnel can issue an emergency command to remind the personnel to evacuate when they command the evacuation. The tag worn by the person vibrates to remind the person to stay away from the area.

SOS active alarm: In case of danger, on-site personnel can send out distress alarm information in time through the one-key distress button, and after receiving the alarm signal, the management personnel can locate and determine the location of the personnel involved in danger, and implement on-site emergency treatment in time.

Support 3D map function: The coal mine personnel system has a 3D display, which can provide accurate 3D maps of underground trapped personnel, underground real-life roadway panoramas and other data information.

Three-dimensional platform.

a) The system should have monitoring functions such as the time when the card-carrying personnel go out of the well, the time when they leave the key area, and the time when they enter and exit the restricted area;

b) the system should have the function of identifying the card-carrying personnel entering and exiting the roadway branch direction;

c) The system should be able to accurately identify card-carrying personnel who take various means of transportation such as electric locomotives;

d) The system should be able to recognize multiple identification cards that enter the identification area at the same time. a) the system should have the total number of people and personnel with the card, the time of exiting the well, the working time of the well, etc. display, print, query and other functions, and have the total number of overtime personnel and personnel, the total number of overcrowded personnel and personnel alarm, display, printing, query and other functions;

b) the system should have the card personnel out of the key area of the total number of personnel and personnel, access to the key area time, working hours and other functions such as display, printing, query, and have the total number of regional overtime personnel and personnel, the total number of overcrowded personnel and personnel alarm, display, printing, query and other functions;

c) The system should have the functions of displaying, printing, querying, alarming, etc., such as the total number of restricted areas and the number of personnel, the time of the restricted area, and the detention time;

d) The system should have the functions of special operations personnel going down, entering the total number of key areas and personnel, exit time, working time display, printing, query, etc., and have the functions of displaying, printing, querying, and alarming the total number of abnormal work personnel and personnel, exit time and working time;

e) The system should have the functions of displaying, printing, querying, and abnormal alarms of the activity route of the card-carrying personnel;

f) The system should have the card number, name, ID number, date of birth, position or type of work, the district team, the main place of work, the number of times per month, the time of going down, the daily situation and other functions of display, printing, querying and so on;

g) The system should have the functions of querying, displaying, and printing according to the classification of departments, regions, times, substations, personnel, etc. The system should have functions such as storage, alarm, display, printing, and query.

At present, the personnel positioning system has become an important tool for coal mining enterprises to monitor and ensure personnel safety. With the increase of the country's attention to production safety, coal mining enterprises have gradually begun to use personnel positioning systems to realize the integration of underground personnel monitoring and management, and improve the level of mine safety management.

Due to the special environment of China's coal mines, there are many problems in mines, such as difficulties in personnel management, safety assurance, and communication, which pose a great threat to the safety of coal mine production. To this end, Jinan Fushen Technology has designed and developed an underground personnel positioning system, which is used to dynamically grasp the location and operation of on-site personnel, and provide more reliable information for daily management and accident rescue.

The system uses radio frequency identification technology to automatically identify underground personnel in a non-contact state, obtain their location, location, name, working hours and other information, and transmit the information to the computer of the monitoring center to realize the automation of personnel management.

Components of the system.

Including monitoring computer, system software, personnel positioning substation, personnel identification card, card reader, ring network switch, transmission interface, power supply, etc.

The monitoring computer and system software are responsible for the collection of data management, network communication, data display, data and data query and other functions of the entire system personnel.

The personnel positioning substation is similar to the function of the card reader, connecting the monitoring center and the personnel identification card, receiving, processing and processing the signals sent by the personnel identification card.

Personnel identification card, recording personnel information, sending wireless signals of personnel information to card readers and positioning substations, can also be called in case of emergency, and communicate with the monitoring center.

The ring switch sends the collected signals to the computer and can also execute remote commands issued by the computer.

Fushen Technology's underground personnel positioning system is developed using advanced technology, which has obvious effects in personnel positioning, personnel attendance, daily management and emergency rescue, and has become a widely used personnel positioning system.

"""The positioning of underground coal mine personnel provided by Nanjing Wasted Communication Technology is composed of the following parts: 1. Identification card: It is designated as an object to wear, which can be personnel, vehicles, and equipment, and can send an alarm through the button, and when the alarm is received, there are sound, light, and vibration warnings.

Low power consumption, can work for months on a single charge. 2. Card reader: installed in the underground roadway, read the surrounding identification card information and distance, and transmit the ranging information of the tag to the ground server.

3. Position calculation engine: a software that calculates the position of the identification card according to the ranging information provided by the card reader. 4. Business server:

The precise personnel positioning system adopts UWB positioning technology, which realizes accurate real-time positioning of personnel by installing positioning base stations in the activity area of coal mine miners and wearing positioning tags for personnel or equipment. UWB positioning has the advantages of strong penetration, low power consumption, good anti-multipath effect, high security, low system complexity, and can improve the accuracy of precise positioning, and is usually used for positioning, tracking or navigation of indoor personnel and objects.

KJ936 precise personnel positioning system combined with wellhead uniqueness detection device to carry out cardless detection, multi-card detection and substitute card detection; The precise personnel positioning system can track the real-time position of underground personnel and vehicles, and comprehensively grasp the activity trajectory of underground personnel and vehicles. Through the electronic fence function, the area can be counted and the dangerous area can be controlled. At the same time, it can also link gas, dust and other sensors for environmental monitoring, and in case of emergency, the personnel positioning system can realize two-way alarm and improve the speed of accident response.

Through the intelligent inspection function, the inspection work of underground personnel can be assessed and managed, and the inspection process can be standardized.

KJ936 precise personnel positioning system is a system that integrates the comprehensive application of radio technology, computer software and hardware technology, automation control technology and network technology. KJ936 precise personnel positioning system is composed of underground personnel management system software, communication interface, lightning arrester, underground personnel management system explosion-proof power supply, underground personnel management system underground substation, underground personnel management system underground card reading substation, hand-held card detector and personnel identification card.

Base station: To use UWB technology to do indoor positioning in a space, a positioning base station must be installed in the space in advance. The positioning base station communicates with the positioning tag through the UWB signal to realize the positioning function of the tag.

Labels: Indoor positioning tags must be worn on the personnel and assets to be located. The tag emits a UWB signal and communicates with the base station so that the tag itself is positioned.

Location Engine: The base station in the environment sends raw data from the network to the location engine in real time (which may be located on a local server or in the cloud). The positioning engine runs a positioning algorithm to calculate the coordinate position with the positioning label in real time.

Display Terminal: The label coordinates calculated by the positioning engine are to be rendered on the display terminal. The terminal of the tunnel high-precision positioning system may be any screen with a browser, such as a PC, tablet, or mobile phone.

The KJ936 precise personnel positioning system operates stably, which can realize the attendance management, real-time positioning and tracking, safety warning and alarm detection of surface and underground personnel, and replace the human management with the machine management, thereby improving the efficiency of coal mine personnel management, production safety scheduling and the informatization level of coal mine safety management. The precise personnel positioning system can monitor the personnel entering the coal mine in real time and check the number of underground personnel at any time. In the event of a catastrophe, the personnel at the accident site can also be queried immediately from the monitoring computer, and the number of trapped people can be displayed in the software, providing a scientific basis for accident rescue.

At the same time, the daily underground positioning management function of the system can also be used to carry out underground positioning management for mine personnel.

The current situation of imperfect function and complex technology and implementation of the current mine underground positioning system; A new method for precise positioning of underground personnel is proposed: the principle of trilateral ranging is used to determine the precise location of underground personnel. The positioning principle and the specific implementation process are introduced in detail: each read head is placed in different positions downhole, and the read heads are within the read-write range of the other two adjacent read heads with each other, and the three-sided positioning principle is applied, when an underground person walks at a certain point in a roadway, three different read heads nearby will collect his information at the same time, and the information collected by these three is transmitted to the well computer at the same time, and an accurate underground real-time position about this person can be easily determined; It can quickly collect the location of underground personnel, realize real-time monitoring and control of personnel, and have important practical significance for improving the safety production management of mines.

The construction personnel or workers carry the active electronic tag with them, which is generally installed on the belt or safety helmet of the construction personnel. The card has two-way and one-way: one-way can only send its own ID number, two-way can not only send information to the monitoring center, the monitoring center can also send information to each construction personnel, and the two-way card has a button and indicator light, which can press the emergency button key in case of danger to make an emergency call.

If the general item is based on attendance, it is recommended to use a single item card; If the system is based on attendance and positioning, it is recommended to use two-way cards. For example, when there is a special situation in the tunnel, the construction personnel only need to press the button, and the monitoring center will have an alarm sound.

When something happens in the monitoring center, the monitoring center can send a signal to each construction worker, or it can be prompted by the indicator light. Card readers need to be installed inside and outside the tunnel. At least 2 units are required in one system.

If it's targeting, you need more. It should be installed according to the condition of the tunnel. The general principle is to install one every 150 meters, but it can also be installed in corners and some areas that require special monitoring.

The principle of positioning of this system is regional positioning, positioning according to the position of each card reader, therefore, the accuracy of positioning depends on the recognition distance of the reader, and the distance of the reader can be adjusted by software, so when considering the positioning accuracy, the distance of the card reading and the whole cost of the system should also be considered, that is to say, the higher the positioning accuracy, the closer the card reading recognition distance, and the cost is high. Please note!