A Mobile Station Locating Method for a Cellular Communication System Based on GDOP

In this paper, the relationship between the locating errors and the location and parameter measurement errors of the mobile station(MS) is presented. Considering the fact of the limited number of the base stations(BS) which receive the signal coming from the mobile station and the relationship between the locating errors and the location of the mobile station stating, a mobile station locating method is proposed for the network-based time of arrival(TOA) locating systems. The proposed method calculates all intersections of the circular lines of position(LOPs) by the analytical method, and then finds the location of the mobile station by the weighted average to all of the intersections with the geometric dilution of precision(GDOP) and the standard deviation of the parameter measurement. The method is characterized by light computational load and short time because it does not need to calculate the inverse of matrix. It works well in a line of sight(LOS) radiowave propagation environment. \;