Infrasonic source altitude localization based on an infrasound ray tracing propagation model

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.