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Inversion for seabed parameters is part of a broader analysis that seeks to characterize the nature of and to quantify the predictability of sound propagation in complex shallow seas. This talk examines results obtained from numerous inversions using real data and attempts to place inversion techniques in perspective as a tool for understanding the physics of the interaction of sound with various types of seabeds. Data sets include those obtained in the Gulf of Mexico, off the eastern coast of the United States, and off the Korean Peninsula. Acoustic data include multifrequency measurements of transmission loss versus range and time series generated by both impulsive sources and surface ships received on both HLA and VLA. The issue of uniqueness is addressed by a combination of methods that include the comparison of inverted results to geophysical measurements, cost function sensitivity, and a comparison of modeled results to independent data not used in the inversion and localization. Of particular inter... |
