Simulation method for oceanic reverberation under any sound velocity gradient

Abstract

The invention discloses a simulation method for oceanic reverberation under any sound velocity gradient, which comprises the following steps of: (1) calculating the variable sound velocity gradient of sea water; (2) evenly distributing a plurality of reverberation scattering elements on a space; (3) calculating the intrinsic sound ray of each reverberation scattering element according to the variable sound velocity gradient of the sea water, and selecting one reverberation scattering element according to the intrinsic sound ray of each reverberation scattering element; and (4) respectively calculating a sea surface reverberation time sequence generated by a sea surface scattering element in the selected reverberation scattering element, a volume reverberation time sequence generated by a volume scattering element, and a sea bottom reverberation time sequence generated by a seat bottom scattering element, and overlapping the sea surface reverberation time sequence, the volume reverberation time sequence and the sea bottom reverberation time sequence to obtain an oceanic reverberation time sequence. The simulation method not only can work under any sound velocity gradient but also can be used for accurately simulating the oceanic reverberation.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic engineering, in particular to a method for simulating ocean reverberation under arbitrary sound velocity gradients. Background technique [0002] Ocean reverberation is the signal generated by backscattering sound waves emitted by the transmitting array in the ocean to the receiving points in the receiving array on the undulating sea surface, uneven seabed and random inhomogeneous bodies inside the seawater medium. It is the main background interference for active sonar and limits the range of sonar equipment. Therefore, more and more people have started research on reverberation suppression algorithms. [0003] In the development process of active sonar equipment embedded with reverberation suppression algorithm, due to the long development cycle of underwater acoustic equipment, large investment, complicated and expensive sea trials, the development process of equipment is limited b...

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Problems solved by technology

[0005] However, on the one hand, since the above method obtains reverberation under the condition of constant sound velocity gradient, and the actual ocean environment is in most cases with variable sound velocity gradient, the above method cannot accurately reflect the actual situation of the ocean, thus affecting the accuracy of the simulation Accuracy and Accuracy

On the other hand, the sonar platform has a certain movement speed in practical application, and the movement of the sonar platform will bring Doppler frequency shift, and the Doppler frequency shift makes the reverberation characteristics have a very close dependence on the azimuth, because The above reverberation simulation method does not consider the Doppler frequency shift with azimuth coupling brought about by the movement of the sonar platform. Therefore, the above method cannot accurately reflect the dependence of the reverberation on the azimuth, which limits the application of the method

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