Abstract
Based on a three-dimensional Hamiltonian ray tracing program in spherical coordinates, the effective sound speed is confirmed as the determining factor that influences the infrasound propagation path, and a theoretical model for the back-projected infrasound propagation trajectory is established. In this paper, the mass spectrometer incoherent scatter radar model (MSISE00) and horizontal wind model (HWM93) are first used to obtain the effective sound speed at different altitudes in summer and winter in Beijing. Then, the propagation paths generated by an infrasound source in Beijing are simulated with a conventional model. Some of the simulated rays are used to verify the back-projection model, and the verification has a high degree of coincidence with the simulation. Finally, using an experiment to validate the back-projection model, the altitude localization essentially conforms to the true value, proving the feasibility of the ray tracing back-projection algorithm.
Highlights
Since the 1990s, according to the requirements of the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) of the United Nations, there has been an increasing demand for monitoring nuclear tests worldwide
Based on existing seismic detection techniques, Cansi1 proposed the progressive multichannel correlation (PMCC) method, which optimized a monitoring array and obtained the azimuth and apparent velocity of an infrasound wave reaching the array in different frequency bands
A back-projection model of the ray propagation path is combined with the azimuth and apparent velocity calculated by the PMCC method to reconstruct the atmospheric propagation path of the infrasound wave and locate the infrasound source, which is of great significance for infrasound monitoring
Summary
Since the 1990s, according to the requirements of the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) of the United Nations, there has been an increasing demand for monitoring nuclear tests worldwide. Researchers in CTBTO countries widely use the azimuth measured by two or more arrays and their geographical coordinates to locate the latitude and longitude of an infrasound source by mapping to the Earth coordinate system This method does not make full use of the information of the apparent velocity and ignores the propagation process of the sound wave in the atmosphere, resulting in the inability to obtain the altitude of the infrasound source. A back-projection model of the ray propagation path is combined with the azimuth and apparent velocity calculated by the PMCC method to reconstruct the atmospheric propagation path of the infrasound wave and locate the infrasound source, which is of great significance for infrasound monitoring. According to existing experimental data, ray trajectories are reconstructed, and the altitude of the source is located accurately, which demonstrates the feasibility of the back-projection model
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