Separation Method of Multipath Propagated Acoustic Signal Based on Higher Order Cumulant

Abstract

The invention discloses a high-order cumulant-based method for the multi-path propagation and separation of acoustic signals. According to the technical scheme of the invention, an original second-order cumulant-based active broadband signal separation method is extended to a fourth-order cumulant. According to the fourth-order cumulant, a corresponding duplicate vector and noise sub-space is constructed. Meanwhile, an additive noise is assumed to be a colored noise during the acoustic signal propagation process. Finally, an acoustic ray path is found out based on the orthogonality of the noise sub-space. The invention also discloses an acoustic ray propagation time tomography-based ocean acoustic tomography method and a sound source localization method. Compared with the prior art, the above method is higher in separation accuracy and can correctly separate acoustic ray paths of smaller intervals. Meanwhile, the method can be applied to conditions wherein the number of sensors is smaller than the number of ray paths. At the same time, the influence of both Gaussian noises and non-Gaussian noises can be inhibited.

Description

technical field [0001] The invention relates to the technical field of acoustic signal processing, in particular to a high-order cumulant-based multipath propagation acoustic signal separation method. Background technique [0002] Acoustic signal processing technology has been widely used in underwater acoustic detection, communication, earthquake, biomedical engineering and many other fields. Since the propagation of sound signals in the medium often exists in the form of multiple paths, what the sensor receives is the aliasing data of the waves propagating through these multiple paths. Each sound ray path is separated from the received multi-path propagation acoustic signal, and this acoustic signal processing method is the multi-path propagation acoustic signal separation method. [0003] Taking ocean acoustic tomography technology as an example, ocean acoustic tomography is one of the most important technologies for detecting the interior of the ocean with the method of...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing smooth active broadband multi-signal separation algorithm, and provide a multi-path propagation acoustic signal separation method based on high-order cumulants, which has higher separation accuracy and can correctly separate Acoustic ray paths with small spacing, and can be applied to the situation where the number of sensors is smaller than the ray path, and can also suppress the influence of Gaussian noise and non-Gaussian noise

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