Abstract
An analytical model is presented for the passive fathometer response to ocean surface noise, interfering discrete noise sources, and locally uncorrelated noise in an ideal waveguide. The leading order term from the ocean surface noise produces the cross-correlation of vertical multipaths, yielding the depth of sub-bottom reflectors. Discrete noise incident on the array produces peaks that may obscure the sub-bottom reflections but can be attenuated with the use of adaptive processing. Such adaptive methods are described and applied to several data sets to demonstrate improvements possible as compared to conventional processing. Motion of the array, due to surface waves, is inferred from the passive fathometer response and, applying a correction for this motion, the seabed reflection is averaged coherently to yield an estimate of the seabed Green’s function.
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