Tracking in range versus time with application to matched field processing of vertical line array data
Keywords:Algorithms, Data processing, Speed, Three dimensional, Tracking (position), Matched field processing, Vertical line array
AbstractEfficient linear three dimensional tracking techniques have been used to improve source localization over that from a single matched-field processing (MFP) ambiguity surface. This paper describes an efficient MFP tracker for data collected by a Vertical Line Array (VLA). The tracker assumes that the source moves at constant speed. Our two dimensional algorithm differs from tracking in three dimensions in that only source range and depth information are required, as would be available for a VLA in an essentially azimuthally independent environment. The source's initial and final range as well as its speed are estimated by the algorithm described in this paper. The method was applied to data which were collected from a VLA as part of PACIFIC SHELF 93. This trial was carried out in the shallow water of the continental shelf and slope off the western coast of Vancouver Island in the north-eastern Pacific Ocean during September 1993. Source track parameters recovered by applying the linear tracker at both 45 and 72 Hz were found to be within the uncertainty associated with the GPS records for the track when the 100 m range uncertainty introduced by the array tether was taken into account. The source level at 45 Hz was typical of a strong line on a merchant vessel while the 72 Hz line was 20 dB lower.
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