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Deep ocean long range underwater navigation

TitleDeep ocean long range underwater navigation
Publication TypeJournal Article
Year of Publication2020
AuthorsMikhalevsky P.N, Sperry B.J, Woolfe K.F, Dzieciuch M.A, Worcester P.F
Date Published2020/04
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000530033900001
Keywordsacoustic tomography; acoustics; Audiology & Speech-Language Pathology; localization; signals

A long range Underwater Navigation Algorithm (UNA) is described that provides a geolocation underwater while submerged without having to surface for a Global Navigation Satellite System (GNSS) position. The UNA only uses measured acoustic travel times from a constellation of underwater acoustic sources analogous to the constellation of satellites in GNSS. The UNA positions are calculated without any a priori track, position or sound speed information, and thus provide a "Cold Start" capability. The algorithm was tested using data from the 2010-2011 Philippine Sea Experiment in which six sources were deployed in a pentagon similar to 400 km on a side. 502 positions of hydrophones in a bottom-moored vertical line array at depths of 485-3037 m drifting in a tidal watch circle up to 600 m in diameter were computed. The sources were 129-450 km from the hydrophone receivers. The mean UNA position error from ground truth was 58 m with a standard deviation of 32 m. The UNA Cold Start Algorithm position can be used as the point in the ocean for calculating acoustic model runs from the source positions with a four-dimensional sound speed field from a general circulation model to improve the accuracy.

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