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.
CN1499877AInactive Publication Date: 2004-05-26HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2004-05-26
Estimated Expiration
Not applicable · inactive patent

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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.
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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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