1. WIFI indoor positioning

　　By measuring the wireless signal strength of mobile devices and three wireless network access points, and using differential algorithms, precise triangulation of people and vehicles can be achieved. The indoor positioning accuracy of WiFi is about 5-10 meters, and the hardware cost is relatively low.

　　2. IBecon (Bluetooth positioning) indoor positioning

　　The indoor positioning accuracy of iBeacon is about 3-5 meters, and low-power Bluetooth devices or Bluetooth base stations need to be deployed indoors. The devices have small size, short distance, low power consumption, and are easy to deploy. By combining iBeacon indoor positioning and indoor maps, real-time location, movement trajectory, current status, and other information of people and objects can be viewed, achieving management functions such as electronic fences, real-time warnings, and data analysis.

　　3. LIFI indoor positioning

　　Li Fi, also known as visible light wireless communication, is an emerging wireless protocol that uses visible spectrum to provide wireless network access.

　　The indoor positioning accuracy of LiFi visible light is about 0.5-1 meters, with an error of less than 10cm. The positioning is precise, maintenance free, and has high safety and confidentiality. However, when the light source is obstructed, it cannot be located. LED light sources that support LiFi positioning need to be installed indoors or existing light sources need to be modified.

　　4. Geomagnetic indoor positioning

　　The indoor positioning accuracy of geomagnetism is about 1-3 meters, without relying on hardware equipment, and requires manpower to collect geomagnetic signals in the field environment. The positioning accuracy is related to the on-site environment, and it needs to be re collected when the location environment changes.

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