Method for estimating position of mobile station and its device

Abstract

The method for estimating position of mobile station includes the following steps: utilizing the correspondent measurement of TOA of main base station and TDOA of other base stations corresponding to main base station to obtain related statistical information of TOA correspondent to main base station and TDOA correspondent to other base station; according to base station position information and related TOA and TDOA statistical informations constructing operation matrix, then using weighted linear least square method at twice to estimate position of mobile station, finally utilizing minium distance difference to select final position estimation valve. Said invention also provides its estimation equipment, including TOA and TDOA generator, information data base and position estimator.

Description

technical field [0001] The invention relates to a wireless positioning technology in a mobile communication system, in particular to a positioning method and device for a mobile station in a mobile communication system. Background technique [0002] In the mobile communication system, time information is usually used to locate the mobile station. This time information-based mobile station positioning method is generally divided into two categories: one is to use TOA (Time Of Arrival: time of arrival of a single signal) for positioning, One is to use TDOA (Time Difference Of Arrival: time difference of arrival of two signals) for positioning. When locating a mobile station, there must be a base station (only one in most cases) to maintain connection with the mobile station. As far as signal measurement is concerned, the TOA measurement of the base station that is connected to the mobile station is relatively easy to implement, because different base stations The TDOA measure...

AI Technical Summary

Problems solved by technology

[0003] Generally speaking, TDOA is directly used to estimate the position of the mobile station. Although TDOA can eliminate a certain degree of systematic error and part of the NLOS (Non_Line of Sight) error, the TDOA measurement of different base stations is also It is easy to implement, but the performance of the position estimation of the mobile station is sensitive to the relative position between the mobile station and the base station, that is, the GDOP (Geometric Dilution of Precision) performance of this type of method is poor, especially when the mobile station is close to The position estimation performance of this method drops significantly when the base station

However, when TOA is used for single-memory location estimation, although the GDOP performance is better and the sensitivity to the location of the mobile station and the base station is low, it is difficult to directly measure the TOA from the mobile station to different base stations. NLOS Error No Suppression

In short, the existing methods have low accuracy for the location estimation of the mobile station

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