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A target group tracking algorithm for wireless sensor networks using azimuthal angle of arrival information

Chinese Physics B 2012年第12期21卷 1-10页

作者：张淳费树岷周杏鹏 School of Automation Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationSoutheast University

In this paper, we explore the technology of tracking a group of targets with correlated motions in a wireless sensor network. Since a group of targets moves collectively and is restricted within a limited region, it is not worth consuming scarce resources of sensors in computing the trajectory of each single target. Hence, in this paper, the problem is modeled as tracking a geographical continuous region covered by all targets. A tracking algorithm is proposed to estimate the region covered by the target group in each sampling period. Based on the locations of sensors and the azimuthal angle of arrival （AOA） information, the estimated region covering all the group members is obtained. Algorithm analysis provides the fundamental limits to the accuracy of localizing a target group. Simulation results show that the proposed algorithm is superior to the existing hull algorithm due to the reduction in estimation error, which is between 10% and 40% of the hull algorithm, with a similar density of sensors. And when the density of sensors increases, the localization accuracy of the proposed algorithm improves dramatically.

关键词： wireless sensor network target group tracking azimuthal angle estimation error

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Effect of variations in the polar and azimuthal angles of coarse particles on the structure of drainage channels in thickened beds

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International Journal of Minerals,Metallurgy and Materials 2023年第12期30卷 2321-2333页

作者： Cuiping Li Gezhong Chen Zhu’en Ruan Raimund Bürger Yuan Gao Hezi Hou Hui Wang Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China CI2MA and Departamento de Ingeniería Matemática Facultad de Ciencias Físicas y MatematicasUniversidad de ConcepcionCasilla 160-CConcepciónChile School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

The 3D reconstruction and quantitative characterization of drainage channels and coarse tailings particles in a bed were conducted in this *** influence of variations in the azimuthal angle(θ)and polar angle(φ)of coarse particles on drainage channel structure was analyzed,and the drainage mechanism of the bed was *** showed that water discharge in the bed reduced the size of pores and throat channels,increasing slurry *** throat channel structure was a key component of the drainage ***φandθof particles changed predominantly along the length *** changes inφhad a cumulative plugging effect on the drainage channel and increased the difficulty of water *** rake and rod formed a shear ring in the tailings bed with shear,and theθdistribution of particles changed from disorderly to orderly during the rotation *** drainage channel was squeezed during the shearing process with the change inθ,which broke the channel structure,encouraged water discharge in the bed,and facilitated a further increase in slurry *** findings of this work are expected to offer theoretical guidance for preparing high-concentration underflow in the tailings thickening process.

关键词： tailings thickening coarse particle azimuthal angle polar angle drainage channels

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Numerical simulation of an acoustic field generated by a phased arc array in a fluid-filled cased borehole

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Petroleum Science 2014年第3期11卷 385-390页

作者： Che Xiaohua Qiao Wenxiao Wang Ruijia Zhao Yuhong State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Key Laboratory of Earth Prospecting and Information Technology China University of Petroleum China National Oil & Gas Exploration & Development Company

Transducers that are widely applied in cement bond evaluation tools, such as cement bond logs and variable density logs, cannot radiate acoustic energy directionally because of the characteristics of monopole sources. A phased arc array transmitter, which is a novel transducer that differs from monopole and dipole transducers, is presented in this study. To simulate the acoustic field generated by a phased arc array in a fluid-filled cased borehole with different channelings, a 3D finite-difference time-domain method is adopted. The acoustic field generated by a traditional monopole source is also simulated and compared with the field generated by the phased arc array transmitter. Numerical simulation results show that the phased arc array radiates energy directionally in a narrow angular range in the borehole, thereby compressing the acoustic energy into a narrow range in the casing pipe, the cement, and the formation. We present the analyses of first-arrival waveforms and the amplitudes of casing waves at different azimuthal angles for the two different sources. The results indicate that employing a directional source facilitates azimuthal identification and analysis of possible channeling behind the casing pipe.

关键词： Phased arc array azimuthal angle first-arrival amplitude acoustic field cased borehole

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