A Modulation Feature Extraction Method of Radiation Noise of Underwater Acoustic Target

A radiation noise and feature extraction technology, applied in modulation carrier systems, modulation type identification, instruments, etc., can solve the problem of difficulty in extracting radiation noise modulation features, achieve good application prospects, solve the difficulty of modulation feature extraction, strengthen fundamental frequency and The effect of frequency doubling components

Active Publication Date: 2021-07-13
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for extracting radiation noise modulation features of underwater acoustic targets, so as to overcome the difficulties in extracting radiation noise modulation features under the interference of strong background noise in existing methods.

Method used

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  • A Modulation Feature Extraction Method of Radiation Noise of Underwater Acoustic Target
  • A Modulation Feature Extraction Method of Radiation Noise of Underwater Acoustic Target
  • A Modulation Feature Extraction Method of Radiation Noise of Underwater Acoustic Target

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Embodiment

[0101] For such as image 3 The measured signal waveform of the radiated noise of the underwater acoustic target is shown. It is known that the propeller shaft frequency of the underwater acoustic target in the experiment is 1.7 Hz.

[0102] The first step: use the hydrophone to collect the ship radiation noise signal, image 3 is the original radiation noise signal time-domain waveform and the Hilbert envelope spectrogram, by image 3 It can be seen that due to the strong background noise, the extracted modulation features are not obvious, and the propeller shaft frequency and frequency multiplier components of the underwater acoustic target cannot be extracted from the Hilbert envelope spectrum;

[0103]Step 2: Use the particle swarm optimization algorithm to optimize the VMD parameters. First, initialize the parameters in the particle swarm optimization algorithm. Use the number of decomposition layers to be optimized and the penalty factor as the particle displacement x(K...

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Abstract

The invention discloses a method for extracting modulation features of underwater acoustic target radiation noise. First, a VMD algorithm based on parameter optimization is adopted, which solves the problems of blindness and randomness in artificially setting parameters of the VMD algorithm, and realizes the self-adaptive setting of parameters; Selecting the IMF with the smallest envelope entropy value as the optimal component for envelope demodulation can extract modulation line spectral features more efficiently; finally, 1(1 / 2) Dimensional spectrum analysis suppresses Gaussian noise and removes the non-phase coupled harmonic term contained in the signal, thereby strengthening the fundamental frequency and frequency doubling components of the modulation line spectrum, and solving the modulation characteristics of underwater acoustic target radiation noise signals under strong noise interference Extract difficult questions. The invention is more stable and reliable, and has stronger modulation feature extraction capability than the traditional DEMON spectrum analysis extraction method, so the method has a good application prospect in the modulation feature extraction of radiated noise of underwater acoustic targets such as ships.

Description

technical field [0001] The invention belongs to the field of underwater acoustic signal processing, and in particular relates to a method for extracting modulation characteristics of underwater acoustic target radiation noise. Background technique [0002] The main components of the radiated noise of underwater acoustic targets such as ships include mechanical noise, propeller noise, and hydrodynamic noise, which contain a lot of information about the motion of underwater acoustic targets, especially propeller noise. The propeller beat has amplitude modulation on the radiated noise signal of underwater acoustic targets. , the amplitude modulation signal is essentially the envelope signal, and the modulation line spectrum is related to the propeller shaft frequency, blade frequency and the speed of the underwater acoustic target. Therefore, if the modulation feature can be accurately extracted from the radiated noise signal of the underwater acoustic target The acquisition of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B13/02H04L27/00G06N3/00
CPCG06N3/006H04B13/02H04L27/0012
Inventor 胡桥郑惠文续丹刘钰唐滢瑾毛景禄
Owner XI AN JIAOTONG UNIV
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