An Acoustic Detection Method for Ocean Internal Waves Based on Vector Sensors with Transceiver Separation

Abstract

The invention discloses a vector sensor-based transmitting-and-receiving-separated ocean internal wave acoustic detection method. According to the method, a vector sensor is adopted as an internal wave detecting instrument which passively collects and processes acoustic signals emitted by a sound source so as to realize the extraction of ocean internal wave parameters. The sound source regularly sends the acoustic signals to the vector sensor fixed to seabed; and the vector sensor completes target spatial range tracking and noise suppression by independently picking up and jointly processing the three-dimensional information of a sound field, and realize ocean internal wave acoustic detection by establishing relationships between acoustic signal time disturbance and internal wave amplitudeand velocity through an internal wave dynamics correlation model. The transmitting of the acoustic signals is separated from the receiving of the acoustic signals, and therefore, the problem that echo signals are severely affected by background can be avoided. The method has the advantages of simple steps, low cost, suitability for any waters and 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 realizing ocean internal wave detection by using a vector sensor to independently pick up and jointly process three-dimensional sound field information. Background technique [0002] Internal ocean wave is a ubiquitous phenomenon in the ocean, which occurs in seawater with stable density stratification, and the fluctuation frequency is between the inertial frequency and the buoyancy frequency. Since the restoring force of the internal wave is mainly reduced gravity, the amplitude of the internal wave is generally greater than that of the surface wave, and the amplitude is several meters to tens of meters, or even hundreds of meters. generation of waves. The generation and mixing of internal waves in the ocean play an important role in the mass, momentum, energy transport and global climate change in the ocean. With the rapid development of my...

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Problems solved by technology

[0003] At present, the non-acoustic detection instruments of ocean internal waves commonly used at home and abroad mainly include mooring instrument arrays, navigating and towing instruments, neutral float detection and satellite remote sensing. By directly measuring the changes in water temperature, salinity, pressure and flow velocity caused by ocean internal waves, internal Wave detection, can not achieve early detection of internal waves and early warning function

The patent of Lin Ju et al. (Application No. 201110168519.7) realizes the internal wave detection by separating the acoustic signal for transmitting and receiving, but it is only limited to the nonlinear internal wave, and the direction of movement of the internal wave that can be detected is also limited, which is not suitable for practical application

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