Wireless positioning method based on distance-measuring error model correction
A ranging error and model correction technology, which is applied in positioning, wireless communication, radio wave measurement system, etc., can solve the problems that cannot meet the high precision requirements, the positioning accuracy is not high, and the distance measurement and positioning positioning error model have not yet been studied. Achieve good anti-interference, improve positioning accuracy, and excellent power consumption
Inactive Publication Date: 2014-10-08
XIANGTAN UNIV
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In comparison, non-ranging positioning technology has low cost and low power consumption, but its positioning accuracy is not high, which cannot meet the high-precision requirements in many application fields
At present, there is no corresponding research on the relationship between ranging and positioning or the positioning error model based on ranging
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[0024] In order to better understand the technical solutions of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0025] Such as figure 1 Shown, the present invention comprises the following steps:
[0026] Step 1: Arrange anchor nodes, use the anchor nodes to measure and locate each other, and train the mean value μ and variance σ of the distance values between anchor nodes in their respective environments to obtain the distance measurement error model ψ.
[0027] The existing UWB ranging error model based on TOA estimation is:
[0028] ψ=ψ m +G(ψ pd +Xψ B ) (1)
[0029] where G and X are Bernoulli random variables, ψ m is the normalized multipath error, ψ pd is the normalized time propagation error, ψ B is the normalized DP blockage error. ψ is the standardized ranging error, the expression is
[0030] ψ = d ...
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The invention discloses a wireless positioning method based on distance-measuring error model correction. The wireless positioning method includes the following steps that first, anchor nodes are distributed, distance measurement and positioning are performed through the anchor nodes, the mean mu and the variance sigma of distance values in the environment of the anchor nodes are obtained, and a distance-measuring error model psi is obtained; second, the anchor nodes and an unknown node are distributed again in the same environment, UWB signals are adopted for TOA distance measurement between the unknown node and each anchor node, and the actually measured distance is obtained; third, according to the mean mu and the variance sigma obtained in the first step, the error correction parameter E1(psi) is calculated; fourth, if the number of the nodes capable of having communication with the node to be tested is larger than 3, the distance obtained in the second step is modified, and calculation is performed according to the error correction parameter E1(psi) obtained in the third step to obtain the corrected distance ; fifth, the coordinates of the corrected unknown node are calculated through a positioning algorithm. The wireless positioning method is based on LOS and NLOS error distribution models and is better in overall precision and stability and lower in power consumption, wide in application range and more feasible.
Description
technical field [0001] The invention relates to the technical field of wireless positioning, in particular to a wireless positioning method based on ranging error model correction. Background technique [0002] With the rapid increase of data services and multimedia services, people's demand for location information awareness is also increasing. Wireless positioning technology is more and more widely used in the fields of military defense, fire safety, smart home, construction machinery, personnel positioning, and environmental monitoring. [0003] At present, the research on wireless positioning technology is mainly divided into two categories: one is based on ranging positioning technology, and the other is non-ranging positioning technology. In comparison, non-ranging positioning technology has low cost and low power consumption, but its positioning accuracy is not high, which cannot meet the high precision requirements in many application fields. The positioning techno...
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IPC IPC(8): H04W64/00G01S5/00
CPCY02D30/70
Inventor 姚志强谭姣盛孟刚简博宇曹璐云
Owner XIANGTAN UNIV