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A Robust Detection Method for Moving Sonar Targets

A technology of target detection and motion sound, which is applied in the field of robust motion sonar target detection, can solve problems such as large detection loss, achieve good detection performance and improve robustness

Active Publication Date: 2017-07-28
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

When this mismatch occurs, existing methods suffer from a non-trivial detection loss

Method used

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  • A Robust Detection Method for Moving Sonar Targets
  • A Robust Detection Method for Moving Sonar Targets
  • A Robust Detection Method for Moving Sonar Targets

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Embodiment Construction

[0024] The invention provides a new space-time self-adaptive detection method for a point target, which uses binary hypothesis data combined with the Durbin test principle to obtain a detection principle formula based on the Durbin test, thereby detecting whether the target exists.

[0025] The specific implementation steps are as follows:

[0026] 1) Based on the echo data received by a linear sonar array composed of N array elements, the point target detection can be attributed to the following binary assumptions:

[0027]

[0028] where H 0 and H 1 Represents the no-target hypothesis and the goal-existing hypothesis, respectively; n and n t , t=1,...,K is an independent, zero-mean N-dimensional compound Gaussian reverberation vector, and its covariance matrix is ​​E[nn H ]=E[n t no t H ] = M, H Represents the conjugate transpose operation; z represents an echo data, also known as the main data; z t , t=1,...,K represents the uniform auxiliary data of length K, an...

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Abstract

The invention relates to a robust motion sonar target detection method. In one embodiment, the method comprises the steps that a set of echo data are acquired via a sonar array and main data and auxiliary data with the same reverberation covariance matrix are selected from the echo data; the maximum likehood estimation of the covariance matrix representing the reverberation statistical characteristics is calculated according to the main data and the auxiliary data; the maximum likehood estimation of target reflection intensity is calculated according to the main data, and then detection statistical amount is calculated by utilizing Durbin inspection guidelines with mismatching of robustness to a guide vector through complementation of a target nominal guide vector; and existence of the target is judged according to comparison of the detection statistical amount and a threshold value confirmed by false alarm probability. Utilization of the echo data is enabled to be more fully by introduction of the Durbin inspection guidelines so that robustness of a space-time self-adaptive detector under the situation of mismatching of the target guide vector is greatly enhanced, and the method has the constant false alarm characteristic for the unknown reverberation background.

Description

technical field [0001] The invention relates to a target detection method, in particular to a robust moving sonar target detection method. Background technique [0002] Ocean reverberation is the main interference of shallow sea active sonar, especially when the sonar carrier has a certain speed, the reverberation in different azimuths has different Doppler frequency shifts, so that the sonar element level reverberation Spreading phenomenon appears on the frequency spectrum. In this way, the low-speed moving target signal will be covered by reverberation, and Doppler cannot be used for reverberation suppression, and even if conventional beamforming is used, it is difficult to effectively eliminate the reverberation entering the receiver from side lobes. Due to the space-time coupling characteristics of motion sonar reverberation, its target detection problem has brought up a new topic for sonar workers. [0003] The generation mechanism and some characteristics of moving s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/04G01S7/539
CPCG01S7/539G01S15/04
Inventor 郝程鹏施博鄢社锋马晓川侯朝焕王哲
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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