UWB module module high-precision positioning scheme coal mine underground personnel positioning system, on August 9, 2021, the National Mining Product Safety Sign Center released the coal mine underground personnel positioning system safety sign management plan (trial)" "Coal mine underground personnel positioning system Safety technical requirements ( Trial Implementation)" and "Inspection Plan for Safety Signs of Underground Personnel Positioning System in Coal Mine (Trial Implementation)", etc.

Coal mining is not only a basic industry for the development of my country's national economy, but also an industry where wealth and high risks coexist. In recent years, the number of fatalities in coal mine safety accidents has been staggering. How to realize the safety control of underground personnel, curb the occurrence of dangerous accidents and improve the efficiency of production safety management through a new generation of technology has become an increasingly concerned and urgent problem in the coal industry.

According to the "Administrative Measures for the Standardization of Emergency Management", the State Coal Supervision Bureau organized the National Safety Standards Committee to compile the "General Technical Conditions for Coal Mine Underground Personnel Positioning System (Draft for Comment)"; the local Coal Mine Safety Supervision Bureau also put forward corresponding trial operation requirements . This move reflects the importance of state and local regulators to coal mine safety.

Before the official release and implementation of relevant national and industry standards, the National Safety Marking Center for Mining Products of Safety Standard also released on August 9, 2021 the implementation plan for the audit and distribution process of safety signs for the coal mine underground personnel positioning system (hereinafter referred to as the system). notify.

In order to promote the application of the coal mine underground personnel positioning system and further standardize the management of safety signs of related products, after investigation and research, extensive solicitation of opinions and expert demonstrations, the management plan for the safety signs of the coal mine underground personnel positioning system (trial), and the safety signs of the coal mine underground personnel positioning system were formulated. The technical requirements (for trial implementation) and the inspection plan for safety signs of underground personnel positioning systems in coal mines (for trial implementation) will be implemented on a trial basis from the date of issuance.

The National Center for Mineral Safety Signs has undoubtedly confirmed the acceleration of the coal mine underground personnel location system.

In the previously issued document notice, there are no restrictions on the use of wireless location technology. The specification mentions UWB, ZigBee, WiFi and even 4G and 5G, but considering the requirements of positioning accuracy, as well as the positioning stability and reliability in the coal mine scene, it can be found that the UWB module module positioning technology will be the most anticipated positioning technology. .

UWB technology

UWB is a carrier-free communication technology, which is a carrier-free communication technology that realizes data transmission, and the bandwidth used exceeds 500mHz. UWB has the characteristics of ultra-wideband, can perform high-precision distance calculation, and the accuracy can reach centimeter level, and has gradually become the mainstream technology in the field of positioning. Compared with other positioning technologies, it has the advantages of high positioning accuracy, strong anti-interference, high transmission rate, large system capacity, and low transmission power. As a high-tech enterprise that started to develop UWB module module positioning technology in China, it can provide multi-form solutions from modules to complete machines.

Device Architecture

For the coal mine personnel positioning system, the high-precision solution equipment structure is as follows:

Badge Cards: Can be worn by people, vehicles and equipment. You can issue a warning via the button. Sound, light and vibration alerts when you are warned. Low power consumption, can work for several months on a single charge.

Card reader: installed in the underground tunnel, reads the surrounding sign card information and distance, and transmits the tag's ranging information to the ground server.

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

Business server: Based on the location information provided by the location calculation engine, it can realize attendance, real-time location display, historical track query, equipment alarm display and other related services.

Handheld Instruments: Search for nearby tags to get distance between devices. It can be separated from the ground server to realize a portable locator.

The whole system is superior in various performances:

(1) The transmission rate is high.

The UWB module module system adopts nanosecond TOF (Time of Flight) ranging, 1 second = 1 billion nanoseconds, and light energy spreads about 30cm in 1 nanosecond. The ultra-high transmission speed greatly improves the accuracy of positioning, and the maximum displacement speed supported by the logo card is greatly increased to 60km/h.

(2) High positioning accuracy.

The positioning accuracy of the system is 10cm, and the positioning direction is recognized.

(3) The coverage distance is long.

Due to the unique technical advantages, the base station coverage is greatly increased to more than 600 meters (within the visual range); 400 cards can be checked at the same time.

(4) Ultra-low power consumption.

In normal working mode, the average current is only about 370ua.

(5) High flexibility.

Customized services can be provided, and the product form is more flexible.

UWB module module system function

Real-time location display: The location information and distribution of underground personnel are located in real time through the personnel positioning system, and the trajectory of personnel is monitored in real time.

Statistics of the number of underground personnel: real-time statistics of the number of underground personnel. When a serious accident occurs, employees can be quickly gathered to conduct roll-call statistics to confirm that the real-time position of the employees is not reached, and rescue and avoid casualties.

Entrance and exit attendance management: formulate attendance tasks, statistic staff entry and exit time, working hours, etc. The management can quickly inquire about the on-duty status, and the monthly statistical time can be directly used for attendance audit reference based on the platform data.

Abnormal emergency warning: In an emergency, managers can issue emergency instructions when commanding evacuation to remind personnel to evacuate. Personnel-worn tags vibrate, prompting personnel to stay away from the area.

SOS active alarm: When encountering danger, the on-site personnel can send out a distress alarm message in time through the one-key distress button. After receiving the alarm signal, the management personnel can determine the location of the risk-related personnel through personnel positioning, and implement on-site emergency response in a timely manner.

Coal mine safety production is closely related to each coal mine personnel and coal mining enterprises. In the future, the coal mining industry will adopt more technologies to ensure the safety of people's lives and property to a greater extent, and provide a strong backing for safe production management.