Target positioning method based on arrival time in mixed sight distance and non-sight distance environment

A time-of-arrival and target positioning technology, applied in the field of target positioning, can solve the problems of positioning performance loss and complexity reduction

Active Publication Date: 2020-01-10
NINGBO UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The complexity of the above two positioning methods has been reduced to a certain extent, but the positioning performance has a greater loss

Method used

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  • Target positioning method based on arrival time in mixed sight distance and non-sight distance environment
  • Target positioning method based on arrival time in mixed sight distance and non-sight distance environment
  • Target positioning method based on arrival time in mixed sight distance and non-sight distance environment

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] A time-of-arrival target positioning method proposed by the present invention in a mixed line-of-sight and non-line-of-sight environment, its overall realization block diagram is as follows figure 1 As shown, it includes the following steps:

[0025] Step 1: Set an unknown target node and N known anchor nodes in the wireless sensor network, and set the distribution of line-of-sight links and non-line-of-sight links in the wireless sensor network to be known; The sensor network establishes a plane coordinate system as the reference coordinate system, and records the coordinate position of the target node in the reference coordinate system as x, and records the coordinate position of the i-th anchor node in the reference coordinate system as s i ; Wherein, N is a positive integer, N≥3, in this embodiment, N=8, i is a positive integer, th...

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Abstract

The invention discloses a target positioning method based on an arrival time in a mixed sight distance and non-sight distance environment. The method comprises a step of establishing different distance measurement models according to a link type between a target node and an anchor node, a step of obtaining a minimization problem through approximate expressions of two different distance measurementmodels by adopting a robust least square method under a worst condition, and further converting the minimization problem into a target function, a step of introducing an auxiliary variable in the target function to be converted into a non-convex problem, a step of relaxing a constraint condition in the non-convex problem by using a convex relaxation technology and introducing a weight and a penalty term to obtain a convex optimization problem, and a step of solving the convex optimization problem to obtain a position estimation value of the target node. The method has high positioning precision.

Description

technical field [0001] The invention relates to a target positioning method, in particular to a target positioning method based on arrival time in a mixed line-of-sight and non-line-of-sight environment. Background technique [0002] In recent years, target location technology in wireless sensor networks has been widely used in the fields of navigation, communication and target tracking. With the development of technology and the progress of society, high-precision target positioning technology has shown a wide range of application prospects in various fields. Therefore, it is very necessary to research on high-precision target localization methods in wireless sensor networks. [0003] According to the characteristic parameters of the received signal and the different application environments, various target positioning methods have been proposed, including Time of Arrival (TOA), Time Difference of Arrival (TDOA), Angle of Arrival (AOA), Received Signal Strength (RSS) and v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/0257
Inventor 李有明王沛鑫曾宇恩卢志刚
Owner NINGBO UNIV
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