Abstract
Source localization based on reliable acoustic path is an important scheme for ocean monitoring in the deep sea. The fluctuating sound pressure propagated from a submerged moving source to deep receivers provides information for source localization. The grazing angle difference between the multipath eigenrays can be estimated using the interference fringes, thereby inferring the source depth. This paper describes a ray separation method and introduces a solution to using broadband and long-term observation information. A method of frequency focusing and grazing angle normalization is proposed to integrate the multi-frequency sound pressure that has been received for a long time, thus reducing the difficulty of extracting the interference fringe interval. Additionally, the analysis on the environmental robustness of source localization using back-propagating sound rays is presented. The simulation results of ray separation and source depth estimation are also given. The grazing angle separation method can be used as a supplementary method for vertical direction estimation. Integrating multi-frequency and grazing angle information with sound pressure field can also be used as an idea of feature engineering in intelligent matching field processing.
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