The principle of UWB module positioning in construction tunnels and other positioning system technologies, I believe everyone is familiar with the positioning system for workers. It is widely used in many construction sites, tunnel projects, and chemical plants. What is its positioning technology? ? The editor summarizes, the key is UWB, radio frequency identification, Bluetooth, and its Wi-Fi four kinds of technologies, different positioning technologies have different characteristics, and working principles are also different. In this article, the editor will give you a detailed introduction to the positioning technology of the personnel positioning system and its working principle.
Introduction to the positioning system for positioning technicians:
1. UWB
UWB module positioning technology is a pulse technology. In short, it is the pulse information sent by the specified bit tag. The base station receives the information, and the distance between the base station and the positioning tag can be obtained by calculating the time difference and multiplying it by the speed of light. During this process, if there is a mask, then the accuracy suffers.
2. Radio Frequency Identification
Radio frequency identification technology uses the transmission characteristics of inductance and electromagnetic coupling or electromagnetic reflection to realize automatic identification of object position and other information. It is a simple control technology suitable for the field of positioning. The function of RFID indoor positioning technology is very close, but it takes a very short time to obtain positioning information, only a few seconds.
3. Bluetooth
This is a short-range, low-power wireless transmission technology. You can obtain user location information by installing an appropriate Bluetooth LAN access point indoors, configure the network for a multi-user-based basic network connection mode, and ensure that the Bluetooth LAN access point is always the primary device for that piconet.
4. Wi-Fi
There are two Wi-Fi positioning technologies. One is to triangulate people and vehicles through differential algorithms, and to use the wireless signal strength of mobile devices and three wireless network access points.
The other is to determine the signal strength of the newly added equipment by comparing a database with a large amount of data, and record the signal strength of the determined location in advance.
Personnel positioning principle of positioning principle:
1. When personnel arrive at the positioning area, they are transmitted to the dispatch center through optical cables to realize automatic positioning of personnel. The positioning device will automatically send information to the outside, and the underground card reader will read the information and transmit it to the card reading substation for processing.
2. Managers provide positioning software for monitoring computers, which can check the location, area, movement trajectory, working hours, etc. of each person, so as to facilitate personnel attendance, master the working conditions of personnel in special positions, and timely detect some violations of regulations and potential safety hazards, Quickly carry out emergency response.
3. For the factory working environment with certain risks, the use of personnel positioning system can effectively ensure safety. From the current widely used areas, in the construction process of tunnels, subways, pipelines, etc., selecting positioning technology can keep track of the direction of underground construction workers, moving roads and other data.
4. In the chemical production process, different types of employees should use accurate positioning skills to complete the treatment of different areas, so as to improve the safety and security capabilities of dangerous production workshops. At the same time, personnel location systems in chemical plants are growing rapidly.
What aspects can be referenced as the choice of tunnel personnel positioning system? These abilities require precise targeting! The tunnel personnel positioning system is a very important facility, which can ensure the safety of the tunnel project. If we want to choose it, on what points should we choose? Mainly the positioning accuracy. whether it can meet the needs. power consumption and endurance. And the difficulty level of deployment. In this article, I'll walk you through two aspects in detail: the methodology for selecting a tunnel personnel location system and the capabilities required for precise location. let us see!
Tunnel personnel positioning system selection points:
1. Positioning accuracy
Different positioning technologies have different positioning accuracy. Looking at the technologies currently used in indoor positioning, they can be divided into three categories in terms of positioning accuracy: one is precise indoor positioning, that is, the accuracy is at the centimeter level, such as the UWB module, the accuracy is 10cm The second is meter-level positioning, such as Bluetooth iBeacon positioning, with an accuracy of about 1-3 meters; the third is regional-level positioning, that is, room-level positioning, such as RFID. WIFI, the accuracy is about 3 to 10 meters, enterprises can choose according to their needs.
2. Can the demand be met?
Of course, the use of the tunnel personnel positioning system is not only for personnel positioning, but also to solve the hidden safety hazards caused by personnel problems, such as inadequate management and control of live areas, and irregular operation and maintenance and maintenance implementation processes. So, are we able to meet the needs of the business. One of the issues to consider when choosing a positioning system is to address the security issues facing the tunnel.
3. Power consumption and battery life
In order to locate people in real time, the premise is that the positioning device can work normally, so the power consumption of the positioning device is also a problem that needs to be considered. Choose a device with a large battery capacity to avoid charging or replacing the battery.
4. Difficulty deployment
The tunnel is a high-risk area, so the positioning system should be simple to install and not require a large number of wires to be distributed. network cables to eliminate security risks caused by wiring. The addition of the positioning system will not bring additional security burden to the tunnel, nor will it affect the normal use of the original equipment. It is necessary to consider the construction period, materials, and the convenience of post-maintenance.
Capabilities required to pinpoint tunnel personnel:
1. Large-scale network base station algorithm technical ability
In tunnels, prisons, chemical plants, power plants, nursing homes, hospitals and other scenarios, UWB modules are used as the carrier of indoor precise positioning technology, and most of the scenarios are used in buildings or fixed spaces. In these scenarios, the site is often large and the personnel density is high, so it is necessary to have the algorithm ability for large-scale networking of base stations.
2. Solve technical capabilities in complex spaces such as signal drift and cross-layer positioning
For example, through the unique algorithm of multivariate data integration, the spatial structure of application scenarios such as chemical plants is relatively complex, and indoor precise positioning systems can identify and correct erroneous values caused by interference. However, traditional data cleaning techniques can only eliminate error values, which is to ensure the effect of data loss, effectively solve the problem of edge signal drift, and achieve cross-layer positioning.
3. Targeted hardware research and development capabilities, combined with different application scenarios
Combined with specific applications such as the smart judicial industry, the positioning bracelet needs to be non-removable, and some anti-disassembly positioning bracelets are embedded with anti-disassembly coils, which can prevent disassembly and prevent cutting. The used positioning base station needs to consider the waterproof and dustproof performance of the closed structure. IP67 protection level; all wearable positioning tags need to consider the charging problem and cannot be charged frequently.
