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Method for eveluating position

An estimation value and error technique, applied in the field of position estimation in cellular mobile station positioning, can solve the problems of no slack variable method, no practicability, and low position estimation accuracy.

Inactive Publication Date: 2004-05-26
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

The disadvantage of the NLOS-TOA relaxation method is that it does not give a method for determining the slack variable with an objective basis, so it is not practical
Therefore, the existing TOA-based position estimation methods have low position estimation accuracy due to the influence of NLOS error

Method used

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  • Method for eveluating position

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Embodiment Construction

[0047] In order to suppress the influence of the NLOS error in the TOA measurement on the position estimation accuracy, the basic idea adopted by the present invention is: when performing position estimation, under the premise of obtaining the mean value and variance of the NLOS error, use the mean value of the NLOS error to convert the non-negative The NLOS error is corrected as a random variable with zero mean, and then the variance of the NLOS error is used to construct the weighted matrix in the weighted least squares position estimation to initially suppress the influence of the NLOS error (the mean value of the NLOS error at this time is already zero) on the position estimate , and finally according to the zero-mean characteristic of the corrected NLOS error, the NLOS error is further suppressed by averaging the position estimation results multiple times.

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings...

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Abstract

First, combining recognized result of NLOS, using mean of NLOS error determined by probability density function and distribution parameter of error, zero mean rectification is carried out for NLOS error in TDOA measurement. Then, combining recognized result of NLOS, using variance determined by probability density function and distribution parameter of error, weighting matrix in method of location estimation is adjusted so as to restrain NLOS error in preliminary. Finally, averaging estimated results in multiple positions realizes restrain of NLOS error further. The above scheme is applicable to LOS environment as well as applicable to NLOS environment and mixed environment between LOS and NLOS. The method restrains NLOS error in realtime effectively without need of follow-up measuring mobile station for long time.

Description

technical field [0001] The invention relates to a position estimation method in the field of radio communication and radio positioning, especially a position estimation method in cellular mobile station positioning. Background technique [0002] In the traditional application fields of wireless positioning technology, such as radar positioning, sonar positioning, and GPS positioning in vast areas, the non-visual (NLOS) propagation path is not a common phenomenon, and the positioning methods in these fields are also based on There are LOS (Visible) propagation paths exist on the basis. However, in the cellular mobile station positioning system, due to the occlusion of ground buildings or the undulation of the terrain, the NLOS propagation of the signal becomes a common phenomenon. time delay) will lead to a significant decrease in the accuracy of position estimation. [0003] In the existing position estimation methods based on TOA (time of arrival), they are basically cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00G01S5/02H04B7/26
Inventor 刁心玺
Owner HUAWEI TECH CO LTD
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