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A New Method of Wireless Positioning Using Range Geometry in nlos Environment

A technology of wireless positioning and a new method, applied in the field of cellular network positioning, can solve the problem of lack of research on cellular networks, and achieve the effects of suppressing non-line-of-sight errors, strong practicability, and improving positioning accuracy

Active Publication Date: 2017-07-04
BEIJING JIAOTONG UNIV
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Problems solved by technology

There have been related studies that have achieved certain results based on the distance geometry theory, but there is no related research in the cellular network environment

Method used

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  • A New Method of Wireless Positioning Using Range Geometry in nlos Environment
  • A New Method of Wireless Positioning Using Range Geometry in nlos Environment
  • A New Method of Wireless Positioning Using Range Geometry in nlos Environment

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Embodiment Construction

[0047] The present invention adopts the general model of signal transmission, considering the signal reflection, refraction, etc. There will be a large deviation compared with the exact measurement value, as shown in the following formula:

[0048] t m =t+ε (1)

[0049] Among them, t m is the actual measured value, t is the measured value in the line-of-sight environment, and ε is the non-line-of-sight error, which is a large positive deviation value. Due to the influence of non-line-of-sight errors in the parameters used in traditional positioning schemes, the positioning accuracy is reduced, such as figure 2 As shown, the measurement values ​​obtained by the mobile station from the three base stations are affected by the non-line-of-sight error, so the positioning results cannot be concentrated at one point, and there is a deviation from the real position. This solution uses the distance geometric correlation theory to find out a set of measured values ​​closest to the ...

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Abstract

The invention relates to a novel wireless positioning method by adopting distance geometry under the NLOS environment. On the basis of TOA measuring values, the method provides two kinds of algorithms based on the distance geometry theory under the honeycomb cell environment on two-dimensional space, and the two algorithms include the filtering algorithm and the constraint algorithm. Firstly, the distance geometry relationships between base stations and between the base stations and a mobile station are utilized for constructing a constraint function, the filtering algorithm conducts position estimation by selecting a set of measuring values with the relatively small error from a plurality of sets of measuring values, and the constraint algorithm conducts nonlinearly constrained optimization on the obtained measuring values to a certain extent and then conducts position estimation. It is guaranteed that under the situation that non-sight-distance measuring values are not identified and removed in advance, the non-sight-distance error can be effectively restrained, and the positioning accuracy can be improved.

Description

technical field [0001] The invention relates to a cellular network positioning technology in a non-line-of-sight environment, in particular to a new wireless positioning method using distance geometry in an NLOS environment. Background technique [0002] In today's cellular network positioning technology, the TOA model positioning algorithm is an important positioning algorithm, which needs to solve the intersection of multiple positioning circles, but the positioning error is very large in the non-line-of-sight environment; the commonly used method to eliminate the non-line-of-sight error is Discrimination and elimination method, it is necessary to carry out a large amount of data sampling and data processing in the early stage to establish the required empirical database, and use these prior information to judge whether the obtained measurement data contains non-line-of-sight errors, which will lead to a huge calculation quantity. Based on this consideration, a TOA positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00
Inventor 赵军辉张浩王娇刘旭
Owner BEIJING JIAOTONG UNIV
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