This paper quantifies, for the first time, the acoustic source levels and beam pattern of the strongest propulsion-system-bome tone emitted from an underway REMUS-100 AUV (Autonomous Underwater Vehicle) by fusing acoustic data from a fixed HLA (Horizontal Line Array) with the AUV's navigation records. The directionality of the tone and the broadband modem signal with respect to the HLA were consistent with the navigational records, thus validating that these signals were indeed emitted by the AUV. Propagation analysis was performed using oases in which the time-varying TL (Transmission Loss) was calculated between the maneuvering AUV and the array. A complementary simulation of the radiated tone was also performed with oases enabling discrimination between the AUV target and a boat interferer. Further studies might include incorporation of bathymetric information into propagation models. Less prominent tones could also be analyzed for aspect dependence. Since AUV maneuvering resulted in a change in frequency, or a diminished primary propulsion tone, a further study might investigate beam patterns for a maneuvering target.
Aspect-dependent radiated noise analysis of an underway autonomous underwater vehicle
Journal of the Acoustical Society of America ; 132 , 5 ; EL351-EL357
2012
7 Seiten, 3 Bilder, 10 Quellen
Article (Journal)
English
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