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Method for eveluating position

An estimated value and error technology, which is applied in the field of position estimation in cellular mobile station positioning, can solve the problems of low position estimation accuracy and lack of NLOS error suppression ability

Inactive Publication Date: 2006-02-22
HUAWEI TECH CO LTD
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Problems solved by technology

The above-mentioned Chen's method is the same as other existing TDOA-based position estimation methods. The disadvantage is that when there is an NLOS error, the measurement error input to the Chen's method no longer satisfies the assumption of a zero-mean Gaussian distribution. At this time, Chen's The method is no longer an optimized position estimation method, which means that Chen's method does not have the ability to suppress NLOS errors
Therefore, the existing TDOA-based position estimation methods have low position estimation accuracy due to the influence of NLOS error

Method used

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Embodiment Construction

[0048]In order to suppress the influence of the NLOS error in the TDOA measurement on the position estimation accuracy, the basic idea adopted by the present invention is: under the premise of obtaining the mean value and variance of the NLOS error, use the mean value of the NLOS error to correct the NLOS error to a random value with zero mean value. variable, and then use the variance of the NLOS error to construct the weighted matrix in the weighted least squares estimation to preliminarily 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 corrected NLOS error The zero-mean feature further suppresses NLOS errors by averaging the position estimation results multiple times.

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0050] figure 1 It is an embodiment flowchart of the method of the present ...

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Abstract

First, combining recognized result of NLOS in location estimation, 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 On the basis of the presence of line of sight (LOS) propagation paths. 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 has become a common phenomenon. Relative time delay) will lead to a significant decrease in the accuracy of position estimation. [0003] In the existing position estimation methods based on time difference of arriva...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/32H04Q7/22G01S5/02H04W4/02
Inventor 刁心玺
Owner HUAWEI TECH CO LTD
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