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Your search keyword '"Gu, Shanqiang"' showing total 4 results
Start Over Author "Gu, Shanqiang" Topic acoustics
4 results on '"Gu, Shanqiang"'

1. The recognition method of thunder based on a noise-estimation algorithm for highly non-stationary environments

Author

Zhao Chun, Tian Hao, Wu Dawei, Gu Shanqiang, Feng Wanxing, Guo Juntian, Yan Biwu, and Zhang Han

Subjects
Engineering, 010504 meteorology & atmospheric sciences, Noise measurement, Thunder, Microphone, business.industry, Acoustics, 010502 geochemistry & geophysics, 01 natural sciences, Lightning, Signal, Noise estimation, business, Algorithm, 0105 earth and related environmental sciences
Abstract

A recognition method of the thunder signal based on the end-point detection method with a noise-estimation algorithm for highly non-stationary environments is proposed. To determine the parameter of the algorithm and verify the effectiveness and accuracy of the method we analyze the acoustic signals obtained from two microphone arrays installed at the top platform on a seven-floor building in Wuhan. In this paper, we have chosen two acoustic signals to test the endpoint detection method. It is revealed from the recognition result that the method can find out the accurate beginning and ending time of the thunder signal from the acoustic signals.

Published
2016

2. Lightning imaging with thunder using broadband direction-of-arrival estimation technique

Author

Zhang Han, Guo Juntian, Lu Enze, Feng Wanxing, Tao Hantao, Wang Haitao, Zhao Chun, and Gu Shanqiang

Subjects
Engineering, Microphone array, 010504 meteorology & atmospheric sciences, Thunder, High-speed camera, business.industry, Acoustics, 020208 electrical & electronic engineering, Photography, Process (computing), Direction of arrival, 02 engineering and technology, 01 natural sciences, Lightning, Broadband, 0202 electrical engineering, electronic engineering, information engineering, business, 0105 earth and related environmental sciences
Abstract

A single-station-based three-dimensional (3D) acoustic lighting mapping system comprising a microphone array has been developed and used for lightning observations, in which a new broadband direction-of-arrival (DOA) estimation techniques namely incoherent signal-subspace method are proposed for thunder signals in the far-field. Two cloud-to-ground (CG) flashes with highly branch channels recorded by the system are analyzed and presented in this paper. The acoustic mapping results can not only locate on the main channel produced by the return stroke process but also depict the branch channels. Moreover, the located thunder sources by the mapping system and the photography of the high speed camera agree well with each other demonstrating the effectiveness and correctness of the estimation techniques and the mapping system.

Published
2016

3. Single-Station-Based Lightning Mapping System With Electromagnetic and Thunder Signals.

Author

Zhang, Han, Gu, Shanqiang, Chen, Jiahong, Zhao, Chun, Wu, Min, Yan, Biwu, and Wang, Yu

Subjects
*LIGHTNING, *ELECTROMAGNETIC devices, *ELECTROMAGNETISM, *SIGNAL processing, *BROADBAND communication systems
Abstract

A single-station-based lighting mapping system comprising a microphone array, which detects electromagnetic (EM) and thunder signals, has recently been developed and deployed for lightning observations. Using one microphone array consisting of 19 electret microphones installed on a 3-D steel frame, this system receives and processes the EM and thunder signals to determine the location of lightning thunder sources. We implement a new broadband direction-of-arrival estimation technique, namely, the maximum power beamforming algorithm and derive the 3-D location results based on the time difference between the acoustic signal and the EM signal. In this paper, four cloud-to-ground flashes with different branch channels recorded by the system are analyzed and presented in which the located thunder sources of two lightning flashes are compared with the photograph of the high-speed camera. The details of the system implementation along with the successful reconstruction of the lightning channel in 2-D and 3-D space are discussed. The results indicate that the location system could effectively map the lightning thunder sources, and the result is highly consistent with the high-speed video camera images. Moreover, the acoustic mapping system is capable of locating the main channel produced by the return stroke process; it also depicts the branching channels. It is shown that the system is capable of distinguish different branches of the same lightning; it also obtains different lightning channels occurring almost simultaneously. [ABSTRACT FROM AUTHOR]

Published
2019
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4. Analysis of magnetic fields radiated by lightning strikes to a building

Author

Zhang Wei, Gu Shanqiang, Xiang Nianwen, and Zhao Zhibin

Subjects
Electromagnetic field, Lightning detection, Physics, FEKO, business.industry, Acoustics, Electrical engineering, Lightning, Magnetic field, Electromagnetic induction, law.invention, Lightning strike, law, business, Physics::Atmospheric and Oceanic Physics
Abstract

Almost all modern buildings use steel mesh, when a large current occurs nearby, such as a lightning return stroke happens, for the law of electromagnetic induction, electromagnetic fields generated by the lightning would certainly be affected. In general case, lightning detection stations are generally placed near the buildings, so the received signal would be affected by the buildings nearby. In this paper, we use FEKO to make geometric models of buildings, with MOM method to calculate whether or how the buildings impact the lightning magnetic field radiation.

Published
2011

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