BROADBAND MATCHED FIELD PROCESSING FOR GEOACOUSTIC PARAMETER ESTIMATION

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Authors
  1. Hannay, D.E.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Jasco Research Ltd, Brentwood Bay BC (CAN)
Abstract
An investigation of the effectiveness and potential of MFP for source localization and geoacoustic parameter inversion using broad frequency bands was carried out. MFP was performed using real data taken on a 16-element 225 m vertical array, at an experimental site with approximately constant 400 m water depth. The sources used were 0.82 kg SUS charges, detonated at 200 m. Forward modelling was performed with the normal mode model ORCA, which was applied at 136 equally spaced frequencies in the 10-60 Hz frequency band. The object functions used for this work included the standard incoherent multiple frequency Bartlett processor, and anew processor referred to as the multiple frequency coherent processor. The standard processor is a simple average of the single frequency Bartlett processor over frequency. The coherent multiple frequency processor includes amplitudes and phase relationships between different frequencies, thereby matching the actual shapes of the measured and predicted waveforms. Consequently, we also refer to the application of this processor as waveform matching. Sensitivities of the two multiple frequency processors to source position and to individual geoacoustic model parameters were measured. These results were compared to those obtained from the single frequency Bartlett processor, applied at 50 Hz. TRUNCATED
Keywords
Waveform matching;Geoacoustic parameter inversion;Coherent MFP;Broadband MFP;Source localization
Report Number
DREA-CR-96-402-SPK — Contractor Report
Date of publication
01 Sep 1996
Number of Pages
34
DSTKIM No
97-01578
CANDIS No
501872
Format(s):
Hardcopy;Document Image stored on Optical Disk

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