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Abstract
Recent analysis of the ship noise data from R/V Oceanus, collected during the RAGS03 winter and base 2007 summer experiments, showed that robust geoacoustic inversions are possible under both winter and summer conditions. In littoral waters, fast‐traveling surface ships provide an excellent (broadband) source of opportunity to characterize the sea floor with a lightly populated vertical array. A well‐mixed and stable water‐column during the winter provides robust geoacoustic inversions up to 20 km in range. Under summer conditions, robust inversions are only possible up to 5 km in range, due to the near‐surface mixed‐layer and highly‐dynamic water‐column effects of internal waves. Matched‐field inversion results from both RAGS03 and Base07 experiments are presented using noise data from different ships at different ranges. Design criteria of a distributed system using single‐element receiver nodes for geoacoustic inversion and oceanographic monitoring are also discussed. [Work supported by ONR.]
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