Side-scan sonar target detection reverberation suppressing technologies

A side-scan sonar and reverberation technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of limited space and increase the complexity of the electronic system of the system, so as to increase the hardware cost, improve the detection performance, and increase the system overhead. Effect

Active Publication Date: 2015-09-02
INST OF ACOUSTICS CHINESE ACAD OF SCI
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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, bu

Method used

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  • Side-scan sonar target detection reverberation suppressing technologies
  • Side-scan sonar target detection reverberation suppressing technologies
  • Side-scan sonar target detection reverberation suppressing technologies

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Embodiment

[0049] The specific technical scheme of the present invention is as figure 1 As shown, the specific description is as follows:

[0050] 1) According to the size of the target and the width of the sonar beam, predict the number of continuous frames containing the signal and set the length of the time window. For example, if the signal echo lasts for 5 echo cycles, the window length should be greater than 5.

[0051] 2) The multi-frame original signal in the first time window is used as the input signal X, and the input signal is a mixed signal of the bottom reverberation and the bottom target echo;

[0052] 3) To calculate the separation matrix W of the input signal, the present invention adopts the joint diagonalization method based on the fourth-order cumulant, and the specific signal processing process is as follows:

[0053] First, whiten the observed signal, and set the original signal as unit variance, namely:

[0054] R s =E{ss H}=I n

[0055] Let Q be the whitenin...

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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...

Claims

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Application Information

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IPC IPC(8): G01S7/537
CPCG01S7/537
Inventor 刘佳许枫杨娟徐亚军吴义军
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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