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A Real-time Acoustic Detection Method of Ocean Internal Waves Based on Line Spectrum Recognition

A real-time detection and line spectrum technology, applied in vibration measurement in fluids, testing of machine/structural components, measuring devices, etc., can solve problems such as complex layout, expensive equipment, and inability to identify internal waves in real time

Active Publication Date: 2020-08-11
杭州海询科技有限公司
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Problems solved by technology

The above methods all have the disadvantages of expensive equipment, complex layout, large amount of calculation used in the processing method, and the inability to identify internal waves independently in real time

Method used

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  • A Real-time Acoustic Detection Method of Ocean Internal Waves Based on Line Spectrum Recognition
  • A Real-time Acoustic Detection Method of Ocean Internal Waves Based on Line Spectrum Recognition

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] The present invention adopts the propeller as the characteristic signal for detecting the internal wave, uses the standard hydrophone to receive the acoustic signal through the set propeller speed, and completes the real-time tracking and detection of the internal wave according to the line spectrum identification.

[0019] The specific steps of the real-time ocean internal wave detection method based on line spectrum recognition are as follows:

[0020] (1) Put the propeller 6 on the ocean platform, and put the standard hydrophone 83014 on the seabed;

[0021] (2) The propeller 6 rotates at a constant speed according to the program setting speed to generate noise, and the standard hydrophone 83014 passively collects the acoustic signal of the monitoring sea area in real time, generating serial signal;

[0022] (3) Use a pre-designed band-pass filte...

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Abstract

The invention discloses an acoustic real-time detection method for ocean internal waves based on line spectrum identification. A propeller with a set rotating speed is used as a sound source, a standard hydrophone 8301 is used for passive acquisition of propeller noise, and real-time detection of ocean internal waves can be realized based on a propeller line spectrum identification algorithm and in combination with physical features of ocean acoustic. The method comprises the steps of: transmitting propeller noise to a standard hydrophone fixed to seabed through the propeller with the set rotating speed, obtaining an envelope value by performing band-pass and low-pass filtering on acquired signals, extracting a demon spectrum to complete the line spectrum identification; comparing with theset propeller rotating speed, tracking continuously, performing secondary identification when abnormal jumping is discovered, and detecting and alarming in real-time. The steps of the method are simple, the propeller is taken as a sound source, cost is low; the method is suitable for any water area, and has a wide application value.

Description

technical field [0001] The invention belongs to the technical field of ocean internal wave monitoring, in particular to a method for detecting and alarming ocean internal waves by using a propeller noise line spectrum recognition algorithm to track known line spectra in real time in a monitored sea area. Background technique [0002] As an extremely common marine natural phenomenon, internal ocean waves are extremely destructive to marine military activities and the utilization and development of marine resources, and are currently a research hotspot in the marine field at home and abroad. In terms of military affairs, changes in the isothermal surface and isodensity surface of the ocean caused by internal waves in the ocean will affect the strength, propagation distance and direction of the acoustic signal in the ocean, increasing the difficulty of underwater communication and target detection. Large-amplitude internal solitary waves can cause rapid ups and downs of the iso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M10/00G01H3/04G01C13/00
CPCG01C13/00G01H3/04G01M10/00
Inventor 白兴宇姜煜
Owner 杭州海询科技有限公司
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