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UWB positioning method based on combination of SVM and barycentric coordinates under NLOS condition

A technology of barycentric coordinates and positioning methods, applied in positioning, electrical components, computer parts and other directions, can solve problems such as inaccurate positioning

Active Publication Date: 2019-11-22
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art and propose a UWB positioning method that combines SVM and center of gravity coordinates under NLOS conditions to solve the problem of inaccurate positioning caused by UWB positioning affected by NLOS in complex environments

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  • UWB positioning method based on combination of SVM and barycentric coordinates under NLOS condition
  • UWB positioning method based on combination of SVM and barycentric coordinates under NLOS condition
  • UWB positioning method based on combination of SVM and barycentric coordinates under NLOS condition

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Embodiment Construction

[0080] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0081] Such as figure 1 As shown, a UWB positioning method combining SVM and center of gravity coordinates provided by the present invention under NLOS conditions comprises the following steps:

[0082] (1) Using FCC-compliant UWB radios to conduct multiple extensive measurements in the indoor LOS environment and NLOS environment, and collect the channel impulse response CPR ( image 3 Shown is one of the signal diagrams under the propagation conditions of non-direct wave and direct wave), and according to these channel impulse response CPR, feature samples that can characterize the propagation conditions are extracted. The main extracted features include: signal reception strength, signal Receive the maximum amplitude, peak value, average excess delay time, root mean square delay spread time, etc., as follows:

[0083] Received ...

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Abstract

The invention, which belongs to the technical field of wireless sensor networks, discloses a UWB positioning method based on combination of an SVM and barycentric coordinates under an NLOS condition.The method comprises: step one, identifying whether a collected measurement value is under an NLOS or LOS propagation condition by using an SVM algorithm and reducing a measurement error caused by theNLOS; step two, with the measurement value under the LOS condition and the measurement value after NLOS reduction, constructing a distance squared matrix and acquiring a relative position of each UWBnode based on an MDS algorithm; step three, calculating a generalized barycentric coordinate related to an unknown node according to therelative positions obtained by the MDS algorithm; and step four, calculating an actual coordinate of the unknown node by combining the generalized barycentric coordinate and the known coordinates of all anchor nodes. Therefore, the NLOS in a complex environmentcan be identified effectively; and the positioning accuracy of the UWB is improved effectively.

Description

technical field [0001] The present invention relates to the technical field of wireless sensor networks, in particular to a UWB (Ultra Wide Band, UWB) positioning method that combines SVM (Support Vector Machine) and barycentric coordinates under NLOS (Non-Line-Of-Sight, NLOS) conditions. Background technique [0002] With the rapid development of wireless sensor network technology, wireless sensor positioning technology has become a research hotspot today, and it has extremely important significance and very broad application prospects in various fields such as commerce, industry and military. In recent years, UWB has developed rapidly. It has the advantages of high transmission rate, low power consumption, strong anti-interference, strong multipath resolution ability, and strong penetration ability. These advantages make it have excellent performance in wireless sensor positioning. However, in some complex environments (such as indoors, underground tunnels, etc.), due to d...

Claims

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Application Information

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IPC IPC(8): G01S5/02H04W84/18G06K9/62
CPCG01S5/02H04W84/18G06F18/2411G06F18/24G06F18/214
Inventor 魏璇林志赟韩志敏
Owner HANGZHOU DIANZI UNIV
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