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9. Improving AOA Accuracy in BLE-Based Localization With a Hierarchical Estimation Framework and Phase Correction Mechanism

Author

Yuan, Yazhou, Liu, Cheng, Zhou, Lili, Xu, Zhezhuang, Liu, Zhixin, and Ma, Kai

Abstract

With the rapid development of the Internet of Things (IoT) technology, location-based services (LBSs) are gaining significant attention for their potential applications. Among the various LBS methods, angle of arrival (AOA) is attracting attention due to its simplicity and ease of implementation. However, in practical applications, the Bluetooth low-energy (BLE)-based 2-D antenna array encounters the problem of constant tone extension (CTE) frequency deviation (FD), which introduces phase impairments. Additionally, the support of periodical advertising (PA) event in Bluetooth poses a challenge for ensuring excellent angle estimation performance in periodic physical (PHY) channels, as the channel overlaps with the Wi-Fi frequency band. To address these challenges, we propose a hierarchical angle estimation (HAE) framework based on the phase difference of single reference antenna. The framework comprises three layers: the data acquisition layer, the phase restoration layer, and the multichannel estimation layer with angle collection solver. The HAE framework enables phase correction and accurate estimation over periodic PHY channels. We validate the proposed method on a real hardware system and demonstrate that it achieves a high level of precision and stability in the estimation of angles, which makes it suitable for practical LBSs applications in challenging environments.

Published
2024
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11. Research of Involute Gear Modification Curve based on Finite Element Contact Analysis

Author

Yuan Yazhou, Shao Nian, Lu Baochun, and Zhang Leilei

Subjects
Finite element, Involute gear, Tooth profile modification, Combined curve, Value of β, Mechanical engineering and machinery, TJ1-1570
Abstract

In order to reduce the gear meshing impact,the method about how to determinate the three factors of gear modification is studied and the optimization of modification curve is discussed. The 3D meshing model of standard involute gear is set up,the finite element contact analysis is carried out. Regarding the integrated elastic deformation of the meshing tooth as the modification value of the gear pair,the contact stress analysis results between long-distance modification and short-distance modification are compared,it is found that the short-distance modification has a better effect. The quadric curve and the sine curve have their virtues and their faults,so combining them into a new curve and the modification effect and feature are discussed. Research shows that,the sudden change of stress with a lower impaction of tooth mesh in and out is eliminated by the new modification method. A new modification curve is provided for involute gear.

Published
2017
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17. Additional file 8 of Transcriptome provides potential insights into how calcium affects the formation of stone cell in Pyrus

Author

Tao, Xingyu, Liu, Min, Yuan, Yazhou, Liu, Ruonan, Qi, Kaijie, Xie, Zhihua, Bao, Jianping, Zhang, Shaoling, Shiratake, Katsuhiro, and Tao, Shutian

Subjects
body regions, food and beverages
Abstract

Additional file 8. Fig. S2 Pear fruit injected with PbCML3. Each fruit is divided into injected side and non-injected side and the stone cells of the fruit are stained red

Published
2021
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18. Additional file 7 of Transcriptome provides potential insights into how calcium affects the formation of stone cell in Pyrus

Author

Tao, Xingyu, Liu, Min, Yuan, Yazhou, Liu, Ruonan, Qi, Kaijie, Xie, Zhihua, Bao, Jianping, Zhang, Shaoling, Shiratake, Katsuhiro, and Tao, Shutian

Abstract

Additional file 7. Fig. S1 The Veen diagram of DEGs. The Veen diagram is drawn by Rscript, which shows the relationship set between the DEGs of S6/S4, S6S5, S3/S1 and S3/S2

Published
2021
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23. An Energy-Efficient Underground Localization System Based on Heterogeneous Wireless Networks

Author

Yuan Yazhou, Xinping Guan, Cailian Chen, and Qiuling Yang

Subjects
Computer science, Real-time computing, Heterogeneous wireless network, lcsh:Chemical technology, Biochemistry, Article, Analytical Chemistry, Scheduling (computing), heterogeneous wireless network, Wireless, lcsh:TP1-1185, Electrical and Electronic Engineering, Instrumentation, energy efficiency, business.industry, Network packet, Wireless network, adaptive packets scheduling, InformationSystems_DATABASEMANAGEMENT, Energy consumption, Atomic and Molecular Physics, and Optics, power control, Embedded system, Industrial Ethernet, business, Heterogeneous network, Power control, Efficient energy use
Abstract

A precision positioning system with energy efficiency is of great necessity for guaranteeing personnel safety in underground mines. The location information of the miners’ should be transmitted to the control center timely and reliably, therefore, a heterogeneous network with the backbone based on high speed Industrial Ethernet is deployed. Since the mobile wireless nodes are working in an irregular tunnel, a specific wireless propagation model cannot fit all situations. In this paper, an underground localization system is designed to enable the adaptation to kinds of harsh tunnel environments, but also to reduce the energy consumption and thus prolong the lifetime of the network. Three key techniques are developed and implemented to improve the system performance, including a step counting algorithm with accelerometers, a power control algorithm and an adaptive packets scheduling scheme. The simulation study and experimental results show the effectiveness of the proposed algorithms and the implementation.

Published
2015

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