Shallow sea target depth classification method based on hydrophone array

A classification method and target depth technology, which is applied in the field of hydrophone array signal sounding, can solve the problems of mismatching model parameters and real parameters, affecting the accuracy of sound source location, and not considering environmental parameters, etc.

Active Publication Date: 2015-07-01
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that the existing shallow sea target depth classification method does not consider the change of environmental parameters, thus causing a mismatch between model parameters and real parameters and affecting the accuracy of sound source positioning. The present invention provides a A classification method based on the depth of shallow sea targets based on hydrophone arrays. This cla...

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  • Shallow sea target depth classification method based on hydrophone array
  • Shallow sea target depth classification method based on hydrophone array
  • Shallow sea target depth classification method based on hydrophone array

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Embodiment 1

[0101] The first step is to establish a signal and environment model.

[0102] The first step of the depth recognition system is to preprocess the data and extract the energy value that changes with time from the received signal. A low-pass finite impulse response (FIR) filter with a 2Hz passband and 2048 samples was used to extract complex energy values.

[0103] The environmental model adopts the arrangement of sound sources at a water depth of 30m in a shallow sea environment, and the frequency of the transmitted signal is 300Hz. A 90-element vertical array is used to receive signals, and the distance between array elements is 1m. The sound velocity profile in the experimental sea area is measured by XBT, and the XBT measurement error is about 0.2m / s. The sound velocity profile during the experiment is approximately 1520m / s constant sound velocity profile, with an average sound velocity disturbance of 0.8m / s. The wave height is measured by radar, and the average wav...

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Abstract

The invention provides a shallow sea target depth classification method based on a hydrophone array. Detection is performed by integrating information received by multiple hydrophones, a typical probability density function of energy field change produced by model-based deep and shallow sound sources is generated by acoustic propagation simulation, likelihood ratio test (LRT) is performed based on the probability density function to identify a received signal, prior knowledge is extracted according to the law of distribution of sound energy within the whole range of a sound field, and thus, depth classification is performed on the sound field target. The algorithm is easy to implement and high in environmental adaptability.

Description

technical field [0001] The invention relates to the field of sounding of hydrophone array signals, in particular to a method for classifying shallow sea target depths based on hydrophone arrays. Background technique [0002] Mode-based depth estimation and classification has been the focus of passive sonar signal processing for many years. The traditional sonar detection problem regards the environmental parameters as certain, and the detection performance (accuracy, scope of application, etc.) depends on the matching degree of the model parameters and the real parameters. The currently best researched technique is Matched Field Processing (MFP), the prediction of its detection performance is inherently deterministic. MFP is also sometimes referred to as generalized beamforming. It uses complex sound field interference patterns to locate the distance, depth, and azimuth parameter combinations of sound sources, and solves the inversion problem of localizing sound sources by ...

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Application Information

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IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 于倍王文博王赞郑胜家黄勇张春华
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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