Tracking a maneuvering acoustic source using multipath (MP) arrivals in an inhomogeneous (IH) ocean medium is investigated. Errors introduced by a horizontally stratified sound speed profile are quantitatively evaluated. A new method of converting MP time difference of arrivals to depth and range which accounts for the IH effect is developed and evaluated. A 3-D target tracker previously used in MP tracking is modified in order to remove estimation biases and improve computational efficiency. Tracking performance is demonstrated using extensive simulation and shown to be greatly improved.
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