Estimating DOA of near sound sources in the air using a single three-component geophone. (April 2023)

• Record Type: Journal Article
• Authors: Wang, Xin; Jiang, Tao; Wang, Kaikai; Chao, Yunfeng; Wang, Jingye; Li, Shuang
• Is Part Of: Applied acoustics. Volume 206(2023)
• Publication Date: 2023-04
• Subjects: DOA -- Near sound sources in the air -- Three-component geophone -- Acoustic-seismic coupling -- Rayleigh waves detection; Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2023.109300
• Languages: English
• ISSNs: 0003-682X

Abstract

Highlights: In the actual acoustic-seismic coupled waves, most of the waves whose polarization characteristics cannot reflect the azimuth of the sound source exist. Such waves are generated by the sound source and may have the characteristics of strong energy. The polarization parameter and frequency domain peak value are used to detect Rayleigh waves with high noise. The DOA of sound source is estimated by using these Rayleigh waves. The accuracy is satisfactory compared with similar methods. The low signal-to-noise ratio characteristics of Rayleigh waves, the aliasing of multiple waves at different distances and the difference of sound sources lead to some differences in DOA results in this study. Abstract: Using a single three-component geophone to estimate the direction of arrival of a near sound source in the air is a challenging study. Through experimental data, we found that the azimuth angle obtained by using the polarization characteristics of the most energetic part of the signal is different from the true value. The research first analyzes the reasons for this phenomenon, and it is thought that the multipath effect of acoustic-seismic coupling may cause most signals to become interference, which makes it difficult to detect useful Rayleigh waves. Then we propose a method to detect Rayleigh waves by combining polarization characteristics and frequency domain peaks. The simulation and actual data shows that the method proposed in this study is still effective in estimating the azimuth of different sound sources in the air in a low signal-to-noise ratio environment. This study also has important implications for the application of long-distance acoustic-seismic coupling and hydroacoustics.