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Underwater sound signal blind deconvolution method suitable for shallow sea low-frequency conditions

An underwater acoustic signal, low frequency technology, applied in the direction of multi-frequency code system, baseband system components, etc., to achieve the effect of eliminating influence, improving unwinding performance, and improving performance

Inactive Publication Date: 2012-01-25
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

Although the horizontal wavenumber can be calculated by underwater acoustic modeling, this requires complete and accurate prior information of the environment

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  • Underwater sound signal blind deconvolution method suitable for shallow sea low-frequency conditions
  • Underwater sound signal blind deconvolution method suitable for shallow sea low-frequency conditions
  • Underwater sound signal blind deconvolution method suitable for shallow sea low-frequency conditions

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Embodiment Construction

[0039] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0040] The contents of this method are:

[0041] 1. Analyzed and studied the modal structure of the signal received by the horizontal array in the shallow sea waveguide, and provided a method to extract the horizontal wavenumber of the normal wave mode propagating in the waveguide from the signal received by the horizontal array (the horizontal wavenumber mentioned here is not the real one. The normal wave horizontal wave value k m (ω i ), but the product k of the horizontal wavenumber and the cosine value of the target azimuth angle m (ω i )cosθ s ).

[0042] 2. A normal wave modal decomposition method under the condition of unknown horizontal wave number in the shallow sea waveguide environment is given, that is, a set of weight vectors required for horizontal array modal decomposition is constructed according to the estimated horizontal wave number, and t...

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Abstract

The invention relates to an underwater sound signal blind deconvolution method suitable for shallow sea low-frequency conditions, which is technically characterized by comprising the steps of: estimating a horizontal wave number in a normal vibration mode from a horizontal array receiving signal by using a wave number estimation method, wherein the horizontal wave number is propagated in a waveguide; and then constructing one group of weight vectors according to the information of the estimated horizontal wave number in the normal vibration mode, and carrying out mode decomposition processing on the horizontal array receiving signal by using the weight vectors for recovering a source signal waveform. The restrain optimal weight vector in the invention can also be used for further improving deconvolution performance of the horizontal array manual time reversal blind deconvolution method provided by Sabra and the like.

Description

technical field [0001] The invention relates to a blind unwinding method for underwater acoustic signals suitable for low-frequency conditions in shallow seas, and is a blind unwinding processing method for underwater signals. Background technique [0002] Due to the multipath effect of the marine environment (especially the shallow sea waveguide environment), the source signal radiated by the remote target will be distorted at the receiving end, which seriously affects the application of underwater acoustic equipment in remote target detection, target recognition, underwater acoustic communication, etc. . How to eliminate the signal transmission distortion caused by the complex underwater acoustic channel characteristics is an important research topic in underwater acoustics. In general, the signal received by the receiver can be regarded as the convolution between the target radiated source signal and the underwater acoustic channel transfer function (Green's function). ...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 孙超郭国强杨益新卓颉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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