Sound source depthkeeping method based on model calculation in deep sea environment

Abstract

The invention relates to a sound source depthkeeping method based on model calculation in a deep sea environment. A hydrophone array with M array elements is arranged from the sea surface to the sea floor. Fourier transform is carried out on signals received by all array elements. All array elements are calculated to acquire median Em(fo), and m=1,2,...,M. Based on the reciprocity and time invariance of a sound field, a sound field model is used for modeling calculation. The method has no requirement for the signal form, and is free of a complicated signal processing process or massive calculation. According to simulation, the depthkeeping algorithm has a good depthkeeping effect at different sound source depths and different distances in the deep sea environment.

Description

technical field [0001] The invention belongs to the fields of deep-sea target depth determination method, underwater acoustic engineering, marine engineering, sonar technology and the like, and relates to a sound source depth determination method based on model calculation in deep sea environment. Background technique [0002] Underwater positioning has always been a hot spot in underwater acoustic engineering research, which mainly includes target orientation, depth determination, distance measurement, and motion velocity estimation. As the level of signal processing technology reaches a certain height, the research on underwater target positioning begins to focus on the structure and influence of ocean channels, among which matching field positioning is one of the more common positioning methods based on ocean channels. In recent years, matching field positioning methods have become diversified, including sound ray arrival angle matching, sound ray delay difference matchin...

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Problems solved by technology

[0003] Scholars at home and abroad have done a lot of research on the problem of determining the depth of the sound source, which mainly involves the following categories: (1) Using the probability density distribution of the target sound source mode to estimate the sound source depth, this method can accurately estimate the marine environment information. The demand is small but requires a large amount of calculation; (2) Use the change of the positive and negative signs of the active component and reactive component of the acoustic energy flow to judge the target depth. This method requires the target sound source frequency to be low, and is usually only used in shallow seas; (3) There are some methods to estimate the depth of the sound source by using the dispersion feature, but often require a higher signal-to-noise ratio; (4) There are other methods to estimate the depth of the target through the means of modal domain processing. The mode selection in this type of method is greatly affected by the marine environment, which is relatively complicated and not robust; (5) In addition, some methods use information such as harmonic interference and acoustic wave arrival delay to determine the depth.

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