Side-scan sonar target detection reverberation suppressing technologies

Abstract

The invention provides a method and a system for side-scan sonar imaging reverberation suppressing. The method comprises the following steps of estimating the statistical characteristics of reverberation according to historic information; and separating reverberation and signals in a feature field according to acquired reverberation statistical characteristics. A combined diagonalization method is adopted for estimating a separating matrix adopted during separation processes. Separation of reverberation from targets is achieved in a statistical domain by using the feature that reverberation is different from the target echo statistical characteristics. The reverberation suppressing aim is further achieved. During a concrete realization process, signals inside one time window serve as a group of observation signals. Separation of echoes and reverberation is achieved by making signals independent of each other to the maximum. Target echoes without reverberation are acquired. The time window then slides to achieve reverberation suppressing of all time frame signals. Clean target echoes for target detection identification are finally provided.

Description

technical field [0001] The invention relates to an underwater acoustic signal processing method for side-scan sonar, in particular to a method for improving the target detection ability of side-scan sonar by suppressing reverberation. Background technique [0002] Side-scan sonar is currently the most widely used underwater geomorphological survey equipment. When working, the side-scan sonar forms two narrow beams in the direction perpendicular to the heading, and reflects the geomorphological characteristics of the seabed through the change of the target echo intensity. The fineness of side scan sonar imaging is relatively high, and it is an important equipment for detecting small underwater targets. When the side-scan sonar is used for underwater small target detection, the bright spots produced by the target echo and the acoustic shadow caused by occlusion are the main features used for target detection. At this time, the bottom echo is the reverberation interference tha...

AI Technical Summary

Problems solved by technology

In the prior art, narrow beams and wide frequency bands are usually used in the design of sonar to suppress reverberation, but this will increase the system volume and electronic system complexity accordingly, and the space for improvement is limited.

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