Infrasonic source altitude localization based on an infrasound ray tracing propagation model
Chuxiang Shang1, Pengxiao Teng1, Jun Lyu1
1Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
The Journal of the Acoustical Society of America
|July 1, 2019
Summary
Effective sound speed dictates infrasound propagation paths. A new back-projection model, validated by ray tracing and experiments, accurately determines infrasound source altitudes.
Area of Science:
- Atmospheric physics
- Acoustics
- Geophysics
Background:
- Infrasound propagation is influenced by atmospheric conditions.
- Accurate localization of infrasound sources is crucial for monitoring and research.
Purpose of the Study:
- To establish a theoretical model for back-projected infrasound propagation trajectories.
- To confirm the role of effective sound speed in infrasound path determination.
- To validate a ray tracing back-projection algorithm for altitude localization.
Main Methods:
- Utilized a three-dimensional Hamiltonian ray tracing program in spherical coordinates.
- Employed the Mass Spectrometer Incoherent Scatter radar model (MSISE00) and Horizontal Wind Model (HWM93) to derive effective sound speed.
- Simulated infrasound propagation paths from a Beijing source using a conventional model.
- Verified the back-projection model against simulated rays and experimental data.
Main Results:
- Effective sound speed was confirmed as the primary factor governing infrasound propagation paths.
- The developed back-projection model showed high coincidence with conventional ray tracing simulations.
- Experimental validation demonstrated that the altitude localization conformed closely to true values.
Conclusions:
- The study successfully established and validated a theoretical model for infrasound back-projection.
- The ray tracing back-projection algorithm is feasible and effective for determining infrasound source altitudes.
- This work advances the understanding and capability of infrasound source localization.
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