Underwater Acoustic Target Recognition Method Based on Time Domain Characteristics of Ship Radiation Noise

A technology of radiation noise and time domain features, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as difficulty in determining the size of parameter sets, increasing recognition targets, and declining recognition performance.

Inactive Publication Date: 2017-06-09
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0006] (1) Only the relationship between the radiation noise of each ship is studied, and the dependence between the units in the data is ignored. When the number of recognition targets increases, the recognition performance drops rapidly;
[0007] (2) The difference in radiation noise data caused by the relative position and occlusion of the same target at different observation angles is not considered. Only one model is established for a ship target. The model is relatively rough and the recognition performance is not good;
[0008] (3) The recognition performance of the model is not considered when the number of samples available for training is small. When the number of samples used for training is relatively small, the recognition performance is greatly reduced;
[0009] (4) There is a manual model selection problem, that is, the parameter set size of the model is determined manually, and the correctness of the given parameter set size determines the final recognition performance
When the data is large, it is difficult to determine the correct parameter set size resulting in poor recognition performance
[0010] Therefore, in view of the above-mentioned defects in the current prior art, it is necessary to carry out research to provide a solution to solve the defects in the prior art and avoid the problem of degradation of recognition performance when recognition targets increase and noise increases

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  • Underwater Acoustic Target Recognition Method Based on Time Domain Characteristics of Ship Radiation Noise
  • Underwater Acoustic Target Recognition Method Based on Time Domain Characteristics of Ship Radiation Noise
  • Underwater Acoustic Target Recognition Method Based on Time Domain Characteristics of Ship Radiation Noise

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[0063] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0064] On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.

[0065] refer to figure 1 , is shown as the flow chart of the steps of the underwater acoustic target ...

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Abstract

The invention discloses an underwater acoustic target identifying method based on ship-radiated noise time domain features. The underwater acoustic target identifying method based on ship-radiated noise time domain features includes steps that carrying out angular domain framing on ship target training-radiated noise data for training; carrying out energy normalization on pre-processed ship training target-radiated noise data and ship testing target noise data; determining parameters of the stick-breaking prior hidden Markov model of each frame in the ship training target-radiated noise data; calculating the conditional likelihood function values of the stick-breaking prior hidden Markov models corresponding to frames of the ship target-radiated noise data for testing and training; using the class attributes of the frame of the ship training target-radiated noise data corresponding to the maximum conditional likelihood function value as the class attributes of ship testing target-radiated noise data. According to the underwater acoustic target identifying method based on ship-radiated noise time domain features, a group of stick-breaking prior hidden Markov models is built along the time dimension of ship-radiated noise signals according to different angular domains of each ship target, and the underwater acoustic target identifying performance is improved.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustics, in particular to an underwater acoustic target recognition method based on time-domain characteristics of ship radiation noise. Background technique [0002] Underwater acoustic automatic target recognition technology can provide information such as the attributes and categories of target ships. It is an important part of modern sonar systems and a key technology to realize the intelligence of other underwater equipment systems. [0003] Ship radiated noise refers to the noise generated by the mechanical operation and ship motion on the ship and radiated into the water. It is mainly composed of mechanical noise, hydrodynamic noise and propeller noise, and contains rich target physical information. Among them, the mechanical noise is the noise sound wave caused by the vibration of the ship's hull and radiated into the sea during the movement of the main engine, propulsion device and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 潘勉刘敬彪于海滨盛庆华蔡文郁章雪挺孔庆鹏刘纯虎周涛曹静
Owner HANGZHOU DIANZI UNIV
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