An Empirical Prediction Algorithm for Low-Frequency Acoustic Surface Scattering Strengths
NAVAL RESEARCH LAB WASHINGTON DC
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We propose an algorithm for calculating surface backscattering strength for grazing angles between 0 and 40 deg, for wind speeds between 0 and 40 knots and for frequencies between 50 and 1000 Hz. The algorithm is based on broadband SUS data collected during the Critical Sea Test series of at-sea experiments. It is intended as a replacement for the Chapman-Harris empirical formula presently used in virtually all low-frequency acoustics reverberation models. The algorithm represents an interim step between the original Chapman-Harris formula and a more detailed description of surface scattering that will take into account a wider variety of environmental factors.