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- W3019911571 abstract "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 ∼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." @default.
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- W3019911571 date "2020-04-01" @default.
- W3019911571 modified "2023-10-02" @default.
- W3019911571 title "Deep ocean long range underwater navigation" @default.
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- W3019911571 doi "https://doi.org/10.1121/10.0001081" @default.
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