Base position positioning is generally used in mobile phone users. The mobile base station positioning service is also called the mobile location service (LBS, Location Based Service), which is the location information of mobile terminal users through the network (such as GSM network) of telecommunications mobile operators.

　　After the mobile devices such as mobile phones are inserted into the SIM card, they will actively search for the surrounding base station information and establish contact with the base station, and in areas that can be searched for signals, there are more than one base station that the mobile phone can search, but the distance is different. During the communication, the base station with the nearest distance and the strongest signal is selected as a communication base station. The rest of the base stations are not useless. When your location is moving, the signal strength of different base stations will change. If the signal of base station A is not as good as the base station B. In order Communication, after coordinating the communication method, it will be switched from A to B. This is why it is also for a long standby day. You need more power on the train than you consume power at home. Mobile phones need to keep searching and connecting base stations.

　　The principle of positioning of the base station is also very simple: we know that the farther from the base station, the worse the signal. According to the signal intensity received by the mobile phone, it can be roughly estimated to be far away from the base station. When the mobile phone searches at least three base stations at the same time The network coverage is a very relaxed thing), which can be roughly estimated to be far away from the base station; the base station is the only determined in the mobile network, and its geographical location is also the only one, which can get three base stations (three points) (three points) The distance from the mobile phone, according to the three -point positioning principle, only needs to be based on the base station as the center, and the distance is the radius to draw a circle multiple times. The intersection of these circles is the position of the mobile phone.

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