Internal Wave Strength Estimation from the ATOC95 Acoustic Transmissions

摘要

My long term goals are to provide the navy with robust algorithms for measuring internal wave fluctuations and for compensating for their effects in passive submarine detection and tracking. The oceanography community is actively working in measuring internal waves with acoustic and nonacoustic methods and the navy surveillance community has neglected the effect of internal wave scattering in their present models. The ATOC95 experiment transmitted broadband signals centered at 75 Hz from Pioneer Seamount, off the coast of California, to a vertical line array (VLA) near Hawaii. The combination of VLA and long range propagation provides the opportunity to perform acoustic mode based internal wave tomography. The strength of the internal wave field is an important oceanographic parameter to the US Navy because of its effect upon acoustic propagation. The range/frequency limits of coherent localization are dramatically affected by internal wave scattering especially at higher frequencies. The final section of this report is work that was presented to the SSBN security program in support of their passive SSBN threat assessment study. It is work that directly benefits from the current research funded by ONR.