Abstract
Boundary reverberation (e.g., due to bottom roughness) can serve as a surrogate probe source in time reversal. A time-gated portion of the reverberation is then refocused to the bottom interface at the corresponding range [Lingevitch et al., J. Acoust. Soc. Am. 111, 2609–2614 (2002)]. In this paper, reverberation nulling is investigated to enhance active target detection. The basic idea is to minimize the acoustic energy incident on the corresponding interface by applying a weight vector on the time reversal mirror which is in the orthogonal subspace to the focusing vector. The feasibility of the reverberation nulling is demonstrated in a recent time reversal experiment at 850 and 3500 Hz.
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