Non-line-of-sight stable positioning method based on signal arrival time in wireless network

A wireless network and time-of-arrival technology, applied in the field of target positioning, can solve problems such as high computational complexity and many optimization variables to solve

Active Publication Date: 2016-02-17
NINGBO UNIV
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The robust positive semidefinite relaxation method does not need to judge whether the signal propagation path is a line-of-sight path or a non-line-of-sight path, and does not need to know the statistical information of the non-line-of-sight error. It only needs to know the u

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  • Non-line-of-sight stable positioning method based on signal arrival time in wireless network
  • Non-line-of-sight stable positioning method based on signal arrival time in wireless network
  • Non-line-of-sight stable positioning method based on signal arrival time in wireless network

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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] A non-line-of-sight robust positioning method based on signal arrival time in a wireless network proposed by the present invention, its overall flow chart is as follows figure 2 As shown, it includes the following steps:

[0031] ① Establish a plane coordinate system or space coordinate system as the reference coordinate system in the wireless network non-line-of-sight environment, and assume that there is an unknown target source and N sensors in the wireless network non-line-of-sight environment, and the unknown target source is in the reference coordinate system The coordinates in the reference coordinate system are x, and the coordinates of N sensors in the reference coordinate system are corresponding to s 1 ,s 2 ,...,s N , where N≥3, if N=6, s 1 Indicates the coordinates of the first sensor in the reference coordinate system,...

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Abstract

The invention discloses a non-line-of-sight stable positioning method based on signal arrival time in a wireless network. The method comprises the following steps: transmission distance measured values from the time when measuring signals are emitted from an unknown target source to the time when each sensor receives the measuring signals is measured; then re-describing is performed on a distance measurement model corresponding to each sensor; next, according to the re-described distance measurement model, an initial stable least square problem is established; afterwards, an epigraph is obtained according to the stable least square problem; then a second-order cone planning problem is obtained by use of a second-order cone relaxation technology relaxation constraint condition; and finally, the second-order cone planning problem is solved by use of an interior point method technology to obtain an estimated value of the position of the unknown target source. The method provided by the invention has the following advantages: a description of the second-order cone planning problem is obtained through relaxing the description of the stable least square problem by use of the second-order cone relaxation technology, it can be ensured that a global optimal solution is obtained without being affected by local convergence, and the positioning precision is high; and since the number of solved unknown optimization variables is small, and thus the calculation complexity is quite low.

Description

technical field [0001] The invention relates to a target positioning method, in particular to a non-line-of-sight robust positioning method based on signal arrival time in a wireless network. Background technique [0002] Targeting is a classic and popular research topic. Over the years, target positioning has played a substantial role in many fields, such as: emergency rescue, target tracking, military reconnaissance, environmental monitoring, traffic surveillance and so on. Just because the market application prospect is very broad, therefore, target positioning has very important research significance. [0003] In real life, it is a very common method to use the Time of Arrival (TOA) information between the unknown target and the sensor to locate the signal with measurement noise. However, the signal propagation between the unknown target source and the positioning sensor may be blocked, that is, the signal propagation path is a non-line-of-sight path, and non-line-of-s...

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Application Information

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IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 王刚张圣金高尚超李有明
Owner NINGBO UNIV
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