At present, Wi-Fi technology has been widely used in modern life, whether it is in leisure places such as cafes or government public places, it can be connected to the wireless networks of major operators anytime, anywhere. Even in the face of the mobile network army, Wi-Fi can also be applied to positioning technology in addition to its established online speed advantages.
Although the most widely used positioning technology is still GPS, users can complete GPS positioning directly through mobile phones. However, GPS still has its limitations in related applications, and there is often a problem that positioning cannot be completed successfully in an indoor environment.
The Wi-Fi positioning technology can make up for the weaknesses of GPS in this regard, not only can strengthen the disadvantages of GPS inaccurate or unable to locate indoors, but also can provide more comprehensive indoor positioning application services to create greater business opportunities and social service.
Although mainstream positioning technologies still have RFID, Zigbee, Bluetooth, and infrared, these emerging positioning technologies still have their own limitations. The main reason is that they must individually deploy dedicated positioning network systems and require greater construction costs.
In comparison, the advantages of using Wi-Fi to complete immediate addressing are significantly improved. The principle of Wi-Fi positioning is to use triangle positioning, which is to communicate wireless signals between the mobile device and the three wireless network hotspots in order to identify the current location of the mobile device, but between the mobile device and the three wireless hotspots The distance is not the same, so the signal strength of mobile devices that react on wireless hotspots will be different, but it can still be located more accurately by the differential evolution algorithm.
The difference between Wi-Fi and GPS in positioning function
Wi-Fi positioning usually places higher requirements on the wireless network. The denser the network hotspot distribution, the higher the positioning accuracy.
In fact, whether it is outdoor positioning or indoor positioning, the principles of the two types of positioning are basically similar, both of which are based on signal transmission to estimate the location, but of course, there are also their own limitations. In fact, as long as the mobile device on the body can continue to connect to the outside world, even if the signal is attenuated, it can still obtain information about the location. The difference is only in the accuracy of the various positioning technologies.
The combination of indoor positioning technology and satellite navigation technology Wi-Fi positioning technology is the trend of the times, in order to take advantage of their own positioning technology, can provide better accuracy and response speed, improve coverage, achieve more complete and accurate Positioning.
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