Underwater vehicle self-noise suppression method based on wavenumber domain filtering
An underwater vehicle and wavenumber domain technology, applied in the field of self-noise suppression of underwater vehicles based on wavenumber domain filtering, can solve problems that are difficult to implement, difficult to extract reference noise signals, accurate positioning or difficult to achieve satisfactory signal separation effect and other issues, to achieve the effect of improving the signal-to-noise ratio
Pending Publication Date: 2021-07-16
ZHEJIANG UNIV
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Problems solved by technology
In the case of limited array aperture, it is difficult to achieve satisfactory results in terms of precise positioning of platform self-noise and signal separation
In addition, the noise source distribution of underwater vehicles during navigation is extremely complex, and it is difficult to describe it with simple point source radiation noise, which causes great difficulties in the extraction of reference noise signals, leading to the use of adaptive noise cancellation technology as a It is difficult to implement the preprocessing method to improve the signal-to-noise ratio
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[0034] The signals collected by the hydrophone array can be divided into water body propagation signals and non-water body propagation signals. There is a significant difference in the propagation speed of these two types of signals. The present invention uses the difference in propagation speed to transform the received signal from the time space domain to the frequency wave number domain. Utilizing the difference in wave number between the water body propagation signal and the non-water body propagation signal, the corresponding wave number domain filter is designed to remove the non-water body propagation signal in the collected signal, so as to achieve the purpose of self-noise suppression of the underwater vehicle.
[0035] The present invention will be further described below in conjunction with the accompanying drawings.
[0036] Such as figure 1 Shown, the present invention a kind of underwater vehicle self-noise suppression method based on wave number domain filtering...
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The invention relates to an underwater vehicle self-noise suppression method based on wavenumber domain filtering. The method comprises the following steps: firstly, converting a received signal from a time-space domain to a frequency-wavenumber domain; then designing a corresponding wavenumber domain filter; finally, performing wave number domain filtering so that the filtered signal is converted from a frequency-wave number domain to a time-space domain. The self-noise is suppressed in a wavenumber domain by using the difference between the propagation of a hydrophone array receiving signal through a water body and the propagation of the hydrophone array receiving signal through an unmanned vehicle body and by using the characteristics of the signal in the wavenumber domain, so that the collected non-water-body propagation noise is mainly removed, and the noise reduction of the receiving signal in the wavenumber domain is realized; therefore, the signal-to-noise ratio of the signal in the corresponding frequency band is improved.
Description
technical field [0001] The invention belongs to the field of self-noise suppression of underwater vehicles, in particular to a self-noise suppression method of underwater vehicles based on wave number domain filtering. Background technique [0002] The self-noise of underwater vehicles is one of the main factors affecting target detection in underwater acoustic engineering. Therefore, the design of self-noise suppression algorithm for autonomous underwater vehicles is an important means to improve the performance of its sonar system. [0003] The self-noise of the underwater vehicle is the noise that can be received by the hydrophone array installed on the underwater vehicle. The noise acting on the hydrophone array mainly includes: [0004] (1) Vibration noise: the noise transmitted to the hydrophone array due to vibration at the connection between the hydrophone array and the platform; [0005] (2) Propeller noise: the noise generated by the propeller rotation of the und...
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Login to View More IPC IPC(8): G01S7/537G01S7/539
CPCG01S7/537G01S7/539
Inventor 李建龙吴俊超
Owner ZHEJIANG UNIV