Abstract
The in‐phase (I) and quadrature (Q) components of the seafloor backscattered acoustic returns received by a Sea Beam multibeam echo‐sounder over a manganese nodules field in the tropical northeastern Pacific have been digitized and recorded on magnetic tape. Because both the I and Q components of the signals were present, the sidelobe interference inherent in multibeam systems [C. de Moustier, J. Acoust. Soc. Am. 79, 316–331 (1986)] was able to be removed, and a complete angular dependence function of acoustic backscattering between ± 20° of vertical incidence was obtained. These results and the sidelobe interference removal method are discussed. [Research funded by ONR.]
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