Passive time reversal reverberation suppression method based on forward prediction

A technology of time reversal and forward prediction, applied to radio wave measurement systems, instruments, etc., can solve problems such as being suppressed at the same time

Inactive Publication Date: 2009-03-18
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0008] In order to overcome the deficiencies of the prior art, the present invention provides a new method of anti-reverberation suppression based on forward prediction, which can solve the problem that the target echo and reverberation may be suppressed at the same time in the current anti-reverberation suppression method

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  • Passive time reversal reverberation suppression method based on forward prediction
  • Passive time reversal reverberation suppression method based on forward prediction
  • Passive time reversal reverberation suppression method based on forward prediction

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Embodiment Construction

[0073] Taking a typical shallow sea waveguide environment as an example, an implementation example of the present invention is given.

[0074] The waveguide environment used is a typical distance-independent layered shallow sea waveguide environment, such as figure 2 shown. It consists of water layer, sediment layer and seabed. z in the picture 0 represents the sea surface, z 1 represents the surface of the sediment layer, z 2Indicates the bottom surface of the ocean floor. The depth of the water layer is 120m, and the sound velocity profile is shown in the curve c in the figure 1 As shown; the depth of the sedimentary layer is 2.5m, and the sound velocity profile is shown in the curve c in the figure 2 As shown, the seabed is a uniform half space, and the speed of sound c 3 =1800m / s. SRA is a vertical array with 32 elements and a 3m spacing between elements. The environment remained unchanged during the test. The simulation test only considers the reverberation of ...

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Abstract

The invention discloses a passive time reversion reverberation inhibition method based on forward predication, comprising: first, processing submarine reverberation and target echo via modeling and multiplying window operations, obtaining a signal sub space corresponding to the target distance, using forward predication to evaluate a submarine reverberation sub space corresponding to the target distance, deriving a group of optimal weighted vectors w of SRA, using the optimal weighted vectors w to process weighted sum on the echo signal x(r, omega) received by SRA, thereby restraining the reverberation component of the echo signal and improving the target echo signal component of the echo signal most, to further improve the echo signal mixed ratio. The invention can effectively restrain reverberation, keep or enhance target echo, to effectively improve echo signal mixed ratio, improve the target detection property of active sonar and improve practicality.

Description

technical field [0001] The invention relates to an underwater acoustic passive time inversion reverberation suppression method. Background technique [0002] With the advancement of technology, active sonar continues to develop in the direction of low frequency, high power, and large aperture. Due to the reduction of operating frequency, the bottom reverberation has increasingly become the main limiting factor of the performance of low-frequency active sonar in shallow seas. Due to its series of special properties, reverberation suppression has always been a difficult problem in sonar signal processing. Time reversal processing (usually referred to as time inversion processing) is a new adaptive processing method that uses the ocean environment itself as a space-time matched filter. Under the conditions, the adaptive space-time focusing of the sound field is realized. In recent years, this time-reversal processing method has been gradually applied to reverberation suppres...

Claims

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Application Information

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IPC IPC(8): G01S7/537
Inventor 杨益新郭国强孙超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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