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Direction of arrival estimation method for ground source based on optimally polarized Rayleigh waves.

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This study introduces a new method for estimating ground source azimuth using optimally polarized Rayleigh waves. It achieves high accuracy, with an average error of 4.95 degrees, improving seismic wave analysis.

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Area of Science:

  • Seismology
  • Geophysics
  • Signal Processing

Background:

  • Estimating the azimuth of ground sources using Rayleigh wave polarization is challenging.
  • The degree of polarization in Rayleigh waves varies with frequency, impacting accuracy.
  • The frequency band with the strongest energy does not always yield the lowest azimuth error.

Purpose of the Study:

  • To develop a direction of arrival estimation method for ground sources using optimally polarized Rayleigh waves.
  • To address the issue of varying polarization characteristics across frequency bands.
  • To improve the accuracy of azimuth estimation using a single three-component geophone.

Main Methods:

  • Selected reciprocal ellipse rate, flatness coefficient, and semi-minor axis angle as polarization parameters.
  • Determined the optimal polarization Rayleigh wave frequency band by analyzing the sum of weights of polarization parameters.
  • Filtered and combined with existing surface wave analysis methods.

Main Results:

  • Achieved an average azimuth estimation error of 4.95 degrees and a standard deviation of 1.82 degrees.
  • Demonstrated that signal-to-noise ratio approximates exponential decay with direction of arrival error.
  • Validated the method on actual data.

Conclusions:

  • The proposed method effectively estimates the azimuth of ground sources using optimally polarized Rayleigh waves.
  • This approach offers a significant improvement in accuracy compared to existing methods.
  • The findings have implications for seismic wave analysis and source localization.