Matched field processing in shallow water using a small aperture horizontal line array
Veenhuis, Robert S.
Wilson, James H.
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Matched Field Processing (MFP) is a beamforming technique which allows for the detection and localization of an acoustic source in range and depth using passive sonar. The performance of MFP in shallow water environments using a short aperture horizontal line array is investigated. Shallow water test cases are utilized to evaluate the effects of frequency, bottom type, relative target bearing, and sound speed profile on MFP performance. Data from RANGEX 1- 92 is also utilized to test the performance of the eight nearest neighbor peak picker (ENNPP) and M of N tracker for a horizontal line array in a real ocean environment. It is shown that MFP performance is significantly better for higher frequencies, for more reflective, bottom types, and for relative target bearings away from the broadside beams. lt is also shown that the performance of plane wave beamformers is severely degraded in shallow water for relative bearings away from the broadside beams, particularly at higher frequencies. Finally, the MFP algorithm in conjunction with the ENNPP and M of N tracker are shown to perform well in the real ocean environment.
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