Abstract
A series of time reversal (phase conjugation) experiments was performed in shallow water including a range-dependent slope environment. Time reversal arrays implemented with center frequencies of 445 and 3500 Hz achieved sharp focal regions up to ranges of 30 and 13 km, respectively, in 110–130 m shallow water. Analysis with an image method indicates that the focal size approaches the diffraction limit of an array for given waveguide conditions, i.e., waveguide geometries and attenuation. The measured focal size has implications for the maximum achievable resolution of matched field processing, which is a computational implementation of the phase conjugation process. [Work supported by ONR.]
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