Abstract
Previous work formulated an adaptive algorithm for exciting a single mode in a shallow-water waveguide using feedback control [Buck etal., J. Acoust. Soc. Am. 95, 2927(A) (1994)]. This paper presents results obtained using this algorithm in a laboratory waveguide experiment under a variety of conditions. Unlike previous laboratory single-mode excitation experiments [Clay and Huang, J. Acoust. Soc. Am. 67, 792–794 (1980); Gazanhes and Garnier, ibid. 69, 963–969 (1981)], our algorithm does not require apriori environmental knowledge, but only the sound-speed profile at the feedback array. The experiment results to be presented demonstrate the algorithm’s convergence behavior and robustness to environmental mismatch. If time permits, present experimental results illustrating the ability of the algorithm to track time variations in the channel will also be presented. [Work supported by ONR and ARPA.]