Abstract
The behavior of incoherent total-field intensity is considered for a moving cw source in shallow water. The ocean channel is assumed isospeed, with a planar perfectly reflecting surface and planar lossy bottom. The source moves on a linear path at constant depth, and the receiver is fixed on the bottom. An expression for incoherent total-field intensity loss is derived in terms of source-motion and environmental parameters. For a bottom with uniform loss per ray reflection, special functions are used to develop and analyze an approximation for intensity. The behavior of this novel approximation with respect to variations in source quantities, such as range, depth, and speed, as well as bottom-loss variations, suggests its possible application in source-motion prediction. Two properties of the approximation, peak curvature and peak width of intensity versus time, are selected as source-motion descriptors. Both are shown to be relatively insensitive to bottom-loss variations, but sensitive to changes in source quantities. Descriptors are applied to an example, and their possible use in supplementing existing passive tracking methods is discussed.
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