A generic matched-field processor is used to track tonal sources recorded on an L-shape array deployed on the seafloor in St Margaret's Bay, Nova Scotia, Canada. The replicas are computed using a normal mode summation based on the Zhang and Tindle model for isovelocity water over an attenuating fluid bottom. The model uses an effective depth approximation to solve for the modes, which makes the code computationally efficient. Localization accuracy for frequencies in the 100- to 300-Hz range was estimated for this environment using known signals from a towed source.
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