An inversion method of geoacoustic properties based on towed tilted line array in shallow water

Abstract

This paper studied a method for extracting seabed reflection losses based on a towed line array for large scale sea areas with high resolution. The experimental system consisted of a towed tilted line array and three acoustic sources to cover a large scope of grazing angles (from 10° to 70°). The simulation results in shallow water show that different arrays have different experimental configurations in order to cover the same scope of grazing angles. The vertical line array must operate with several acoustic sources and requires a stationary platform of the array. The towed horizontal line array needs only one acoustic source but requires a large aperture line array. The towed tilted line array combines the merits of the vertical line array and the horizontal line array, which can invert the seabed acoustic parameters in a moving and high resolution way, and requires only a smaller aperture line array. The error resulting from the distortion of the array shape was analyzed for the inversion method.