Passive time reversal reverberation suppression method based on forward prediction

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...

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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 , while avoiding the active anti-reverberation suppression method that needs to perform repeated operations of active transmission-reception processing for each possible target distance, providing an effective and reliable method for the actual engineering application of time-reversal processing in reverberation suppression

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