A uwb positioning method combining svm and center of gravity coordinates under nlos conditions

A technology of barycentric coordinates and positioning method, applied in the direction of positioning, electrical components, computer parts, etc., can solve the problem of inaccurate positioning, and achieve the effect of improving positioning accuracy, ensuring performance, and reducing ranging errors.

Active Publication Date: 2021-06-22
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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  • A uwb positioning method combining svm and center of gravity coordinates under nlos conditions
  • A uwb positioning method combining svm and center of gravity coordinates under nlos conditions
  • A uwb positioning method combining svm and center of gravity coordinates under nlos conditions

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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 discloses a UWB positioning method combining SVM and barycenter coordinates under NLOS conditions, and belongs to the technical field of wireless sensor networks. The method can be divided into the following steps. Step 1: use the SVM algorithm to identify whether the collected measurement values ​​are under NLOS or LOS propagation conditions, and alleviate the measurement error caused by NLOS; The measured value constructs a distance square matrix, and uses the MDS algorithm to obtain the relative position of each UWB node; Step 3: Calculate the generalized barycentric coordinates of the unknown node according to the relative position obtained by the MDS algorithm; Step 4: Combine the generalized barycentric coordinates with each anchor node The known coordinates of the unknown node are calculated. The method provided by the invention can effectively identify the NLOS in a complex environment, and effectively improves the positioning accuracy of the UWB.

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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Patent Type & Authority Patents(China)
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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