Abstract
The focus of this research is the synthesis of spatial and temporal processing to perform simultaneous inversion for environmental parameters and to localize moving broadband sources in shallow water environments. The processed data are a sample of broadband cross spectra from either individual phones or subaperture beams for one or more FFT sequences. An inversion using simulated annealing to estimate both environmental and source parameters is performed using a cost function that measures the correlation between the sample of data cross spectra and corresponding modeled cross spectra. Thus, the data are processed coherently in frequency and time. For each iteration of the simulated annealing search, the cost function is computed on a grid of initial source positions for a specified source speed and course and for specified seabed geoacoustic parameters. Horizontal line array data collected in February 1998 in the Gulf of Mexico using SWAMI are processed, and the results for the geoacoustic parameters from the inversion using the exercise ship as the source are compared with previous results obtained from light bulb implosions. [Work supported by ONR.]
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