Abstract
Geometric and radiometric corrections are necessary to convert raw seafloor acoustic backscatter data to imagery in which the intensity variations are due to the geoacoustical properties of the bottom and the angular dependence of the backscattering process. Radiometric corrections include removal of the combined effects of the sonar's transmit and receive beam patterns, and removal of the area ensonified. To this end, a method is presented to estimate the transmit/receive beam pattern of a multibeam swath mapping sonar using seafloor acoustic backscatter data collected over an entire survey area. This involves estimating the scattering area at each sounding based on local seafloor slopes. For a given sonar installation, results show that such beam pattern estimates remain stable to within ± 0.5 dB over different survey areas.
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