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.
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