UWB achieves time synchronization. The arrival of 5G era promotes the continuous development of the Internet of Things. Indoor positioning technology provides very accurate location information data, among which, uwb high precision positioning module indoor positioning technology with high precision, high security, these excellent characteristics make UWB has a huge application potential in the consumer market. Therefore, in recent years, UWB is a very popular indoor positioning technology, which develops rapidly and stably in the B-end market, while the C-end market is also paid special attention by many business giants. Therefore, the development status of indoor positioning technology UWB is worth looking forward to.
UWB is called UltraWideBand, that is to say, ultra wideband communication. Before the 1990s, the technology was mainly used for military radar systems, and when it developed to the civil stage, it was also mainly used for B-terminal, such as personnel or materials in vertical industries such as factories, warehousing, tunnels, and high-precision positioning justice. For example, in the aspect of personnel location in coal mine, indoor positioning technology based on ultra-wideband uwb high-precision positioning module has great advantages. According to the requirements of the General Technical Conditions for Positioning System for Underground Personnel in Coal Mines (Draft), a safety production industry standard prepared by the Coal Mine Safety Standards Committee organized by the State Coal Administration, UWB positioning technology is ahead of other wireless technologies in terms of accuracy. It can meet the requirements of "the large static positioning error of the accurate positioning system for coal mine personnel is no more than 0.3 meters". In fact, this requirement has also been clearly confirmed in the final compilation instructions, which refers to the accuracy of UWB positioning technology. The constant high personnel positioning accuracy in coal mine has reached 5cm~10cm. The real-time indoor positioning is in the form of hard hat positioning label and label card, which better guarantees the safety of underground miners.
In addition, uwb high-precision positioning module indoor positioning labels have also made outstanding contributions to epidemic prevention and control. Virus prevention requires preventing people from gathering, preventing inter-departmental contact, developing preventive measures in densely populated areas, and achieving accurate personnel tracking. Comprehensive elimination work. Based on UWB positioning technology, the social distance alert system has a range error of up to 10 CMS. By positioning bracelets, positioning tags, positioning base stations, and being deployed in the control area, it can fully integrate the "prevention" and "control" solutions for epidemic prevention.
In terms of market, domestic UWB enterprise-class application market shipments have reached one million in 2018. According to the market forecast data, in the enterprise application market, UWB will still maintain the ultra-high development momentum. It is expected that by 2025, the chip shipment will reach 50 million pieces, and the scale of the domestic enterprise application market of uwb high-precision positioning module will exceed 100 billion yuan. What is more exciting is that the brilliance of UWB B terminal technology has also attracted the attention and participation of C-terminal enterprises.
In fact, although many mobile phones have started to support UWB indoor location technology, smart tabs based on UWB location technology may be the first smart product other than smartphones. The industrial chain of indoor positioning technology UWB in the TOB market is relatively simple, which can be divided into chip and solution two links. Some companies are even working on the complete layout of chips and solutions. In the TOC market, the industrial chain of UWB technology is forming chip chips. Module. Complete machine and other links, but also our development opportunities.
How does UWB realize time synchronization of indoor positioning technology? Various positioning algorithms are used to achieve real-time accurate positioning data of indoor positioning technology. The positioning algorithms and positioning accuracy of various indoor positioning technologies are different. What is the method of UWB to achieve time synchronization? We know that TDOA and TOF are the two positioning methods adopted by the positioning system, which ensure the accuracy and greatly reduce the positioning power consumption. What is the indoor positioning technology method to realize positioning time synchronization of uwb high precision positioning module?
What is the time synchronization of UWB indoor positioning technology? TDOA This is a method of positioning using the arrival time difference. The tag card sends a UWB signal to the outside world. All base stations within the range of the UWB location tag receive the wireless signal. Because the distance between the tag and the base station is different, the time point at which the base station receives the signal is also different.
Therefore, in order to achieve synchronization of positioning time and to accurately measure time, we need to ensure that positioning tag and positioning base station are in the same time system, such as Beijing time. And everyone is in a certain area, because UWB base stations have a coverage range of 100-300m, and if you are thousands of miles away, that certainly doesn't meet the time synchronization conditions.
How do I solve the time synchronization problem of UWB? We know that the positioning system of ultra-wideband uwb high-precision positioning module has high requirements for time measurement. Inaccurate time measurement will seriously affect the positioning accuracy, and 1ns time difference will lead to 30cm position error. Therefore, the problem of time out of sync must be solved. There are two common solutions, wired sync and wireless sync.
1. Cable synchronization
Wired synchronization is equivalent to all UWB positioning base stations using the same table, that is, the synchronization controller. The synchronization controller transmits the time information to each base station through wired communication, so that each base station is in the same time system to realize time synchronization. The advantage of this synchronization method is that the time measurement accuracy is high, and the time between each UWB positioning base station can maintain a high degree of synchronization, with low technical difficulty and easy implementation. The problem is that the deployment costs are high because each base station needs to be wired to the synchronization controller. The wiring planning becomes very complicated and there are a lot of wiring when deploying the UWB positioning system. But the synchronization accuracy will be relatively high.
2. Wireless synchronization
Wireless synchronization means that each UWB positioning base station continuously exchanges team clock information with other base stations to achieve and maintain overall time coordination. That is, UWB locates the signal interaction between base stations, tells the other base stations what time it is, and then adjusts its own time to be in line with the other base stations. Wireless synchronization depends on the measurement time accuracy of UWB. The higher the time accuracy, the smaller the time error between the two base stations, the higher the degree of time synchronization. The advantage of wireless synchronization is that there is no need for wired connections between base stations, so the deployment of UWB positioning system is less difficult and less costly. Synthetically comparing the two synchronization methods, each has its own advantages and disadvantages. Ultra wideband uwb high precision positioning module positioning system using wireless synchronization method, is also an industry with UWB wireless synchronization technology manufacturers. Time measurement accuracy has reached ps level, the time between the base station and the base station can reach a high degree of synchronization, to achieve 10cm accurate positioning.
