Abstract
Backscattered sound waves of seabed sediments are important information carriers in seafloor detection and acoustic characteristic parameters inversion. Most of the existing methods for estimating geoacoustic parameters are based on multiangle seabed backscattered signal processing and suitable for flat seafloor conditions with uniform sediment thickness. This usually deviates from the real field conditions and affects the accuracy of parameter estimation. In this paper, the sound ray propagation theory is studied and analysed under the condition of sloping seabed and uneven sediment thickness. Based on the phased parameter array sonar system, a method of acoustic parameters estimation of the sediment under inclined seabed conditions is proposed. The simulation results show that the new method shows good adaptability to different inclination angles of the seabed and solves the problem of accuracy of acoustic parameter estimation of the inclined seabed sediments. The model will greatly reduce the seafloor topography requirements in the sediment acoustic parameter inversion, such as velocity, layer thickness, and acoustic impedance.
Highlights
Geoacoustic parameters of submarine sediments are the basis of shallow sea communications, seabed resource detection, and other seabed scientific research studies [1,2,3,4]
Most methods of acoustic parameter inversion are based on the underwater acoustic methods, such as the matching field inversion method [7,8,9], the seabed reflection loss inversion method [10, 11], and the highresolution local seabed inversion method
An inclined seabed model based on the method of multiangle seabed backscattering signals detected by the phased parametric array is used in sediment sound velocity inversion
Summary
Geoacoustic parameters of submarine sediments are the basis of shallow sea communications, seabed resource detection, and other seabed scientific research studies [1,2,3,4]. In order to solve this problem, the method of acoustic parameters acquisition of seabed sediment in the measured area must be effective. E high-resolution local seabed inversion method adopts multisound source transmission and vertical array reception in different places to complete the measurement of geoacoustic parameters in the short distance area, but the inversion efficiency is low and the project is more difficult to achieve [14]. E multiangle backscatter method is based on the common point arrangement of the transceiver; this method uses the time-delay information of echoes in different directions to measure the sound velocity of the deposited layer, and the calculation method is simple. An inclined seabed model based on the multiangle seabed backscatter signal is proposed Under this assumption, there is no fluctuation in the seabed terrain within the measurement range and the sedimentary layer is isotropic.
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