Abstract
Existing methods for source localization in an ocean waveguide generally require simultaneous range and depth estimation as they are intrinsically coupled in the acoustic field. Using beam intensities averaged over ranges longer than the mode cycle distances, it is shown that the range-averaged vertical beam distribution is insensitive to the source range and sensitive to the source depth. An incoherent matched beam processing method is presented and applied to the SWellEx96 moving source data to estimate source depth based on the 127 and 130 Hz signals with good results.
Highlights
Acoustic source localization in an ocean waveguide is a subject of great interest
Using beam intensities averaged over ranges longer than the mode cycle distances, it is shown that the range-averaged vertical beam distribution is insensitive to the source range and sensitive to the source depth
Matched field processing (MFP) is based on matching the acoustic pressure field data on a vertical line array (VLA) with the modeled replica fields computed via a numerical propagation model
Summary
Acoustic source localization in an ocean waveguide is a subject of great interest. While there exist many methods to estimate the source range, there are very few methods to estimate the source depth without knowing or simultaneously estimating the source range. A simple method based on the range-averaged signal vertical arrival angle pattern is presented in this paper for source depth estimation as opposed to depth discrimination (see Ref. 1 and references therein). MFP is based on matching the acoustic pressure field data on a vertical line array (VLA) with the modeled replica fields computed via a numerical propagation model.. Source location can be estimated when the replica field for an assumed source range and depth best matches the data field. When the acoustic environment used to generate the replica field does not match with the real environment, as in a range-dependent or time varying environment in the presence of eddies, internal waves, turbulence, etc., one has the so-called environmental mismatch problem, which causes significant problems for source localization because the calculated acoustic field, its phase, does not match with the data at the true source location. Considering a source moving from range r1 to r2, and integrating Eq (2) over range, the range-averaged beam power as a function of angle is given by zsÞjsjÀ2
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