Abstract
Matched field processing (MFP) for geoacoustic inversion has been applied largely in the frequency domain using an incoherent combination of correlations at several frequencies. In source detection and localization problems, similar incoherent broadband MFP techniques have been shown to be inferior to coherent MFP techniques. Coherent MFP exploits source spectrum information when this is available, yielding more robust detection and localization results. This experience suggests that there is potential to improve geoacoustic inversion by MFP using a coherent algorithm. This work assesses that potential through a comparison of inversion results from incoherent and coherent methods, evaluating performance and cost. Estimates are made of water column depth and sediment geoacoustic properties for both synthetic data and real data from the SWellEX 96 experiment. The SWellEX data processed in this work correspond to source transmissions of lfm and hfm pulses, the spectra of which are employed in the coherent processing. [Work supported by ONR, Ocean Acoustics.]
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