WiFi is indoors indoor positioning.Compared with the popular UWB and Bluetooth AOA positioning technology that has been popular in the past two years, the anti -interference ability is weak. The WiFi positioning accuracy is only rice, but it is better than the transmission distance and extremely low cost. The WiFi positioning scheme is very suitable for pan -positioning scenarios such as department stores and shopping malls. Therefore, WiFi technology also occupies an important position in the development of indoor positioning.
As the name suggests, WiFi positioning is a positioning technology based on WiFi signal. It is divided into a positioning signal acquisition mode, WiFi network passive positioning and WiFi terminal active positioning.
WiFi network side passive positioning. It is based on wireless LAN or special WIFI probe network. It receives the WiFi signal on the server side and analyzes and calculates. Calculate the smart terminal position (the smart terminal that does not require positioning is installed with specific programs, and does not need to be connected to a specific network). WiFi network -side positioning can realize the location perception of on -site wireless network devices, and calculate the mobile trend, crowd density and target target trajectory of the crowd. In the ideal environment, the average positioning accuracy of Zhongke Gold is about 5 meters.
WiFi terminal side active positioning. Generally speaking, it is a positioning method represented by WiFi position fingerprints. The WiFi position fingerprint recognition algorithm is a WiFi positioning algorithm that depends on the signal features sent by the terminal receiving the surrounding AP for positioning, and uses the RSSI signal strength database for comparison, analysis and identification, and the database corresponds to the actual geographical location. The WiFi terminal is actively positioned in the real -time navigation location service of the mall and parking lot. Under an ideal environment, the average value based on WiFi active positioning accuracy is about 3 meters.
WiFi relative positioning. In addition to the above two WIFI positioning methods, there is another relative positioning technology that is not known to the public. Compared with the above two WIFI positioning, the relative positioning of WIFI can achieve the distance judgment between the two terminals, or even the direction identification. There is no need to use a map or a public WiFi signal at the same place. In the business practice of Zhongke Golden Point Company, the positioning accuracy that can usually be achieved is about 5 meters, and there is no need to leave the two terminal distance judgment of the two terminals of the map application.The
Subsidant WiFi positioning scheme is formulated according to the scene, which can better optimize the positioning accuracy, while ensuring its own advantages, and realize the maximum application value of indoor+WiFi.
WiFi positioning technology, Nuggets.
Although the passive positioning of the WIFI network side is limited by the mobile phone privacy protection mechanism in the later stage, the best solution is still the passive positioning of the WIFI network side to perceive the distribution of passenger flow in some specific public places.The commercial value of
WiFi network -side positioning is based on the infrastructure of the existing wireless LAN. Without the state of perception, there is no additional equipment. It can be used for emergency commands in large indoor public places such as airports, stations, and sports centers lte iot.
The active positioning of the WiFi terminal side is also restricted by the mobile phone privacy protection strategy. Many indoor real -time navigation applications have shifted to the Bluetooth Ibeacon technology route, but the WiFi terminal positioning still has its special advantages in some specific scenarios. For example, in parks or communities, wifi fingerprints have better WIFI fingerprint characteristics compared to past shopping malls, because a large number of wireless APs or home routers are distributed in these scenarios. Based on these WIFI fingerprint characteristics, it can be matched with some patrol business applications through the APP background positioning, or CAT. 1.1. Patrol chest card realizes ultra -low cost cleaning, safe real -time attendance and trajectory management. Compared with the huge hardware investment of UWB or Bluetooth AOA, it has higher practical business value than the operator's 4G IoT WiFi positioning technology.
The relative positioning of WiFi that is not known to the public can be used as a technical supplementary method for solving the existing anti -loss device in the existing anti -loss device equipment in the room. For example, through the preset e -sentinel, the pet loss device that is relatively positioned in WIFI is integrated, which can realize the electronic fence settings of pets in the building. Even if pets enter the room, it can easily grasp the actual position and find it.
Three WiFi positioning technologies that realize commercial value are in line with their own differentiation, subdivision and customization of application scenarios, and realize higher solution application value. However, most of the WiFi positioning is used for personnel unconscious positioning, so the WiFi network side positioning accounts for the proportion of most applications in the current environment.