On August 17, 2017, hosted by China Internet of Things Industry Application Alliance, Shenzhen IoT Media's theme was "Location Services and Applications in the Internet of Things era" --2017 Shenzhen International Positioning Technology and Applications Forum was grandly held in Shenzhen Convention & Exhibition Center Hold. Mr. Tang Wei, General Manager of Shanghai Gaoheng Communication, shared a brilliant speech on the topic of "Indoor Location Technology Exploration" at the scene of the conference and shared Gao Heng's view on the current location technology and the three positioning technologies of Gao Heng.
Shanghai Tong Heng Tang Wei, general manager of communications
Tang Wei said that with the continuous expansion of the indoor positioning market, applications will also continue to increase. However, different fields have different pursuits for technology. Some applications pursue high-precision and others pursue low-cost. The constant pursuit of high-Heng is the least hardware installation, and always as a constant high-position system development preconditions.
Current positioning technology analysis
1) GPS
Mobile location has been widely used, and GPS has become a standard smartphone. GPS positioning system is the use of satellite signals to locate the time difference, in the outdoor environment positioning accuracy range of 10 meters to 17 meters distance. The current application of a very wide range, but due to indoor environments such as building block, poor signal strength reasons, GPS positioning system is not suitable for indoor environments.
2) mobile base station positioning
In order to make up for the lack of GPS positioning system, communication operators have proposed a method for positioning the triangulation of base stations by mobile operators as long as they are available in the coverage area of ​​mobile communication signals. The accuracy is usually about several hundred meters, but indoor Distribution system, indoor accuracy is generally low.
3) WiFi or Bluetooth triangulation
Nowadays, WiFi signals are almost completely covered in an indoor environment such as a large shopping mall. Therefore, WiFi or Bluetooth triangulation can utilize the difference in signal strength or time difference of multiple base stations to achieve basic positioning requirements in an indoor environment. However, when a dedicated base station needs to be deployed, In the case of the system, the cost is high, and it is difficult to guarantee the positioning accuracy in the complicated environment.
4) Dedicated beacon positioning
Dedicated beacon positioning LED, ultrasonic, WiFi, Bluetooth, etc. can be used as positioning beacons to mark the position of the cell phone with beacons. The positioning accuracy generally depends on the beacon density. However, the location of beacon positioning a larger amount of construction and maintenance process is relatively complicated.
Technical Analysis of Three Positions of Gao Heng
Wireless features of positioning technology
Wireless feature spectrum to meet the specific needs of the market and apply to the specific environment as the design principle, to reduce the site construction as the basic starting point, so as to achieve "good enough" performance. The technology uses GAO Heng tool to quickly collect wireless signals, extract feature spectrum, stored in the location database, and when the user needs, according to the user to report on-site wireless signal samples to find the matching position.
Technical characteristics of mobile phone indoor positioning of the radio feature spectrum are:
1) The use of the original base station, micro-cellular, indoor distribution systems, WiFi and other signal sources
2) Take full account of the random fluctuations of radio signals, multipath, occlusion, decline and other factors
3) The use of probability theory to establish mathematical models, using multi-level recursion, fuzzy matching algorithm
4) Mobile phone sensor motion tracking technology to improve system stability
Positioning technology ultrasonic time lag
In reality there are still some places where there is no source and no radio signals exist, such as the highway tunnel under development. To this end, Gao Heng also designed and developed a set of ultrasonic time-lag positioning system, the system is composed of ranging equipment in the launch of a beam of sound or ultrasound, mobile phones automatically detect ranging pulse signal, the use of self-developed detection algorithm to calculate the distance, Wirelessly transmit to the WiFi base station, transmit to the management center and record and display the real-time position of the construction staff. Its main advantage is the small number of devices, easy installation, and does not rely on the original signal at the scene.
Positioning technology signal direction detection
At the conference site, General Tang also mentioned that directional information will be more reliable than intensity information, while Gao Heng's base station can detect a 360-degree area and can know the specific source of information at any moment. The principle of this technique is to use radio phase control techniques to direct the radio waves in a specific direction and to allow the radio waves to rotate as required. Applying this principle to a wifi base station allows the beam to be directed in the desired direction.
Tang always expressed that Gao Heng's development of this positioning system can obtain two angles of arrival by allowing two base stations to monitor signals of the same source at the same time and can accurately know their specific positions in space. Its main advantage is the small number of field devices, easy installation, independent of the original signal on site and high positioning accuracy.
About Shanghai Gaoheng Communication Technology Co., Ltd.
Shanghai Gao Heng Communication Technology Co., Ltd. is a provider of indoor positioning services of professional technology providers. The major products are: based on the wireless spectrum of indoor positioning systems, personnel positioning systems tunnels, integrated Pilots staff positioning systems.
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