Methods of studying the ground reflectivity in the low-frequency range with the help of combined receiving devices are discussed. The value of the acoustic bottom reflectivity obtained by forming unidirectional characteristics of the receiving system is compared with that measured by the interference technique. It is noted that the measurement error can be decreased by a simultaneous use of data on the pressure field sections and the vertical component of the oscillatory velocity field.
Department of Acoustics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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