Ocean acoustic tomography method based on time delay sensitive nucleus

Abstract

The invention discloses an ocean acoustic tomography method based on a time delay sensitive nucleus. First of all, a sending and receiving array is arranged at a sea area to be measured for obtaining measured acoustic signals, at the same time, model receiving signals are obtained by use of a prior acoustic velocity profile under a normal-mode model, afterwards, correlation-based waveform template coupling is performed on the model signals and the measured signals, and peak pairs and propagation delay inequalities are obtained; then an integration relation between the propagation delay inequality of each peak and two-dimensional acoustic velocity change is constructed by use of a propagation time delay sensitive nucleus method, and an acoustic tomography inverse medium problem model is established; and finally, an actual acoustic velocity is estimated through such inverse problem methods as a least square method with smooth constraints, a convex optimization method of sparse vectors and the like. According to the invention, simulation examples show that the time delay sensitive nucleus method provided by the invention can construct a two-dimensional acoustic speed profile of the sea area to be measured by use of propagation time delay information of the peaks and can achieve higher precision and resolution.

Description

technical field [0001] The invention belongs to an ocean acoustic tomography method, in particular to an ocean acoustic tomography method based on a time-delay sensitive core. Background technique [0002] Ocean acoustic monitoring technology is an important research field in the process of human understanding, development and utilization of the ocean. In this field, ocean acoustic tomography is gradually attracting attention and becoming the most effective method. Similar to medical CT to detect the human body, ocean acoustic tomography uses propagation time delay or other acoustic observations to calculate the internal information of the ocean through which the sound field passes, mainly including the sound velocity profile and flow velocity in the ocean. Since the information such as the propagation time delay of the observation is a function of the ocean parameters such as the sound velocity profile, the reconstruction of the ocean parameters from the observation informa...

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Problems solved by technology

[0005] Aiming at the traditional simple ray model-based ocean acoustic tomography method, whose accuracy and resolution are limited by the high error of the ray model at low frequencies, the present invention proposes an ocean acoustic tomograp

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