Normal wave modal frequency dispersion elimination transformation-based sound source distance and depth estimation method

A technology of dispersive transformation and depth estimation, which is applied in the fields of underwater acoustics and underwater acoustic signal processing, and can solve the problem that the depth of the sound source cannot be estimated effectively.

Active Publication Date: 2016-10-12
NORTHWESTERN POLYTECHNICAL UNIV
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The waveguide invariant method uses the robust interference structure characteristics of the sound field in the shallow sea waveguide on the distan

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  • Normal wave modal frequency dispersion elimination transformation-based sound source distance and depth estimation method
  • Normal wave modal frequency dispersion elimination transformation-based sound source distance and depth estimation method
  • Normal wave modal frequency dispersion elimination transformation-based sound source distance and depth estimation method

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Embodiment Construction

[0043] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0044]In order to make full use of the information of the modal dispersion curve after the dispersion transformation and realize the distance estimation of the sound source depth, a target sound source using distance-dispersion parameters for two-dimensional plane focusing ranging and matching modal energy for depth determination The positioning method is used to estimate the distance and depth of the sound source in the shallow sea area. This inventive method utilizes the phenomenon that the sound pressure focuses on the distance-dispersion parameter two-dimensional plane after the received signal in shallow sea undergoes dispersion-elimination transformation. Only when the propagation distance parameter of the received signal is equal to the target sound source distance, the normal wave The amplitude of the sound pressure reaches the maximum value, so the dista...

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Abstract

The invention relates to a normal wave modal frequency dispersion elimination transformation-based sound source distance and depth estimation method. According to the method, based on a phenomenon that shallow sea received signals are subject to frequencydispersion elimination transformation and then realize sound pressure focusing on a distance-frequency dispersion parameter two-dimensional plane, only when the transmission distance parameter of the received signals is equal to the distance of a target sound source, the sound pressure amplitude of normal waves can be maximum, and therefore, the distance parameters of the target sound source can be estimated; after the received signals have been subjected to the frequency dispersion elimination transformation, modes of first few orders can be separated obviously in the time domain, and the energy of the modes of the first few orders can be accurately estimated; and a multi-modal energy matching mode is adopted, so that the depth of the target sound source can be determined.

Description

technical field [0001] The present invention relates to a method for estimating the depth and distance of sound sources in shallow seas, in particular to a method for estimating the distance and depth of sound sources using normal wave dispersive transformation. field. Background technique [0002] The invention is mainly used for shallow sea sound source depth distance estimation. In the shallow sea environment, because the underwater acoustic environment is very complex, sound source localization has always been a key issue in the field of underwater acoustics. For low-frequency broadband signals propagating in shallow seas, due to the influence of the ocean medium, the superposition and dispersion of normal waves will occur. The dispersion of the underwater acoustic channel is mainly determined by the characteristics of the waveguide, which is expressed as the change of the eigenwave number of the normal wave with frequency. Although the dispersion characteristics of t...

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Application Information

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IPC IPC(8): G01S15/42G01S15/46
CPCG01S15/42G01S15/46
Inventor 杨坤德郭晓乐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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