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Geometric positioning improvement method under NLOS (non-line-of-sight) environment

A technology of geometric positioning and environment, applied in electrical components, wireless communication, etc., can solve the problem of low positioning accuracy

Active Publication Date: 2011-08-31
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
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Problems solved by technology

[0004] In order to avoid the above deficiencies in the prior art, the present invention proposes a method for improving geometric positioning in an NLOS environment to solve the problem of low positioning accuracy

Method used

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  • Geometric positioning improvement method under NLOS (non-line-of-sight) environment
  • Geometric positioning improvement method under NLOS (non-line-of-sight) environment
  • Geometric positioning improvement method under NLOS (non-line-of-sight) environment

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Embodiment Construction

[0057] Such as figure 1 Shown is the specific flow chart of the implementation method of the present invention. The improved hybrid TOA / AOA geometric positioning method of the present invention is realized in the following steps:

[0058] (1) Parameter measurement

[0059] The mobile station measures the wireless signal parameters of the base station, namely the signal arrival time (Time Of Arrival, TOA) and signal arrival angle (Angle Of Arrival, AOA) And combining the geometric position relationship between the mobile station and the base station, the position of the mobile station can be calculated.

[0060] In an NLOS (non-line-of-sight, non-line-of-sight) environment, due to obstacles or scatterers, the TOA and AOA parameter values ​​measured by the mobile station have large errors. Such as figure 2As shown in , the NLOS propagation environment is simulated by the geometrically based single bounce macrocell circular model (GBSBCM) model. The model utilizes an assum...

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Abstract

The invention relates to a geometric positioning improvement method under an NLOS (non-line-of-sight) environment, which adopts the Gauss-Newton iteration method with fast convergence, and combines with a grid searching method to optimize the iteration initial coordinate value. Compared with the existing geometric positioning method, the geometric positioning improvement method has the advantages that the complexity is moderated, the fast and stable convergence is provided, and the higher mobile station positioning accuracy can be obtained.

Description

technical field [0001] The invention relates to an improved geometric positioning method under the NLOS environment, which is applied to the technical field of cellular network wireless positioning. Background technique [0002] The geometric positioning method is to estimate the position of the mobile station according to one or more measurement parameters and the geometric distribution relationship between the base station and the mobile station. [0003] The measurement error of the parameters TOA and AOA used for position calculation is mainly composed of two parts, that is, the system measurement error and the error caused by NLOS propagation. The system measurement error obeys the Gaussian distribution and will gradually decrease with the continuous development of technology, while the NLOS propagation error will always exist due to the influence of the radio wave propagation environment and become the main component of the measurement error. Scattering models are one...

Claims

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Application Information

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IPC IPC(8): H04W24/08H04W64/00
Inventor 赵军辉赵聪李秀萍
Owner BEIJING JIAOTONG UNIV
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