The terminal side positioning system consists of terminal devices (such as mobile phones embedded with SDK software packages) and beacons. The specific positioning principle is

　　1) Firstly, lay Bluetooth beacons in the area. Generally, at least 3 Bluetooth Beacon beacons need to be laid, and the positioning algorithm requires knowing the RSSI values of at least three points to accurately calculate the positioning.

　　2) Beacon continuously broadcasts signals and receives data packets to the surrounding area

　　3) When the terminal device enters the range covered by the beacon signal, its RSSI value is measured at different base stations, and then the specific location is calculated using the built-in positioning algorithm of the phone.

　　At present, Bluetooth terminal side positioning is widely used in the field of indoor positioning. Terminal side positioning is generally used for indoor positioning navigation, precision location marketing and other user terminals; Network side positioning is mainly used for personnel tracking and positioning, environmental detection, asset positioning, and passenger flow analysis.

　　The advantage of Bluetooth positioning lies in its simple technical process, but the positioning accuracy is closely related to the laying density and transmission power of Bluetooth beacons. With the improvement of urban infrastructure, Bluetooth positioning has certain advantages. In addition, Bluetooth positioning has low power consumption and is very suitable for users with long-term standby needs. There are many ways to achieve low energy consumption, such as deep sleep, no connection, and simple protocol.

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