Base Station

The base station is positioned generally applied to mobile phone users, mobile phone base station positioning service called mobile location service ( LBS ), it is through the mobile telecommunications network operators ( such as GSM ) of obtaining mobile terminal user position information ( latitude and longitude coordinates ), in the electronic map platform support, to provide users with the appropriate service a value-added services, such as the China Mobile M-Zone provides dynamic location query service. The general principles for: mobile phone base station measurement different downlink pilot signal, different base station downlink pilot frequency TOA ( Time of Arrival, arrival time ) or TDOA ( Time Difference of Arrivalm, time difference of arrival), according to the measurement results and combined with the base station coordinates, generally use the trigonometric formula estimation algorithm, can be to calculate the position of the mobile telephone. The actual position estimation algorithm needs to consider multiple base station ( 3 or more than 3 ) localization algorithm, thus a more complicated. In general, the mobile station is measured by base station number, the higher measuring accuracy, positioning performance improvement is more obvious.

Technical principle

Mobile phone base station measurement different downlink pilot signal, different base station downlink pilot frequency TOA ( Time of Arrival, arrival time ), according to the measurement results and combined with the base station coordinates, generally use the trigonometric formula estimation algorithm, we can calculate the position of the mobile telephone. The actual position estimation algorithm needs to consider multiple base station ( 3 or more than 3 ) localization algorithm, thus a more complicated. In general, the mobile station is measured by base station number, the higher measuring accuracy, positioning performance improvement is more obvious.

Mobile phone location is defined by specific positioning technology to access the mobile phone or terminal user position information ( latitude and longitude coordinates ), the electronic map is positioned object location technology or service. Positioning technology to have two kinds, one is based on the GPS positioning, one is based on the mobile network base station location. GPS based localization method is the use of the GPS mobile phone positioning module will own the location signal is sent to the background to achieve the positioning of mobile phone positioning. The base station positioning is the use of mobile phone base station distance measuring distance to determine the location of the mobile phone. The latter does not need a mobile phone with a GPS positioning capability, but the accuracy depends largely on the base station distribution and coverage of the size, sometimes error will be over a kilometre. The former high positioning accuracy. In addition to the use of Wifi in small range positioning mode.

The main application

The base station positioning is mainly applied to mobile phone users, GPS handheld terminal, as China Mobile M-Zone provides dynamic location query service Google maps and other types of mobile phone; mobile phone map software in the rough localization; and GPS with the A-GPS and so on are the use of base station positioning to achieve.