Abstract
During the FAF05 experiment, two vertical arrays of 29 sources and 32 receivers both covering a large part of the shallow water ocean were located 5 km from each other. A complete acquisition of the waveguide impulse responses between each source and each receiver was performed every 20 s during several hours using broadband pulses at 3.5 kHz. Using time-delay beamforming on both the source and receiver arrays, each ray path was isolated and matched to a ray code based on an a priori model of the environment. Following this approach, the impulse responses data matrices were then inverted over time to obtain a movie of the range- and depth-dependent fluctuations of the sound speed between the two arrays. Spatial resolution is discussed as a function of the number of rays used in the inversion. [Work supported by ONR.]
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