Abstract
Acoustic bottom backscattering strength measurement results from an experiment conducted in the shallow waters of the North Sea are presented. The data were obtained using a bottom-mounted high resolution (narrow beamwidth) pulsed parametric sonar transmitter and conventional receiver. Scattering strength values were obtained as a function of frequency (3–20 kHz) and azimuth (100° sector) at a grazing angle of 9°. The average scattering strength values are dependent on frequency and exhibit little azimuthal dependence. Instantaneous scattering strength values obtained from point scatters within the insonified area of interest exhibit a high degree of frequency and azimuthal dependence. The data are found to be reasonably consistent with the experimental data of Urick, and Bunchuk and Zhitkovskii [Sov. Phys. Acoust. 26(5)(Sept.-Oct. 1980).] [Work supported by NAVSEA.]
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