Line spectrum feature enhancement method and system based on phase gradient error estimation technology

A technology of error estimation and phase gradient, which is applied in the field of line spectrum feature enhancement based on phase gradient error estimation technology and its system, can solve the problems that line spectrum feature enhancement cannot be realized, and achieve line spectrum feature enhancement with obvious effect and high precision high effect

Pending Publication Date: 2022-03-11
SOUTHEAST UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a line spectrum feature enhancement method and system based on phase gradient error estimation technology to solve the technical problem that line spectrum feature enhancement under arbitrary array conditions cannot be realized

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  • Line spectrum feature enhancement method and system based on phase gradient error estimation technology
  • Line spectrum feature enhancement method and system based on phase gradient error estimation technology
  • Line spectrum feature enhancement method and system based on phase gradient error estimation technology

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Embodiment 1

[0075] The invention discloses a line spectrum feature enhancement method and system based on phase gradient error estimation technology. The method can correct the distortion of the towed line array and the influence of the delay vector outlier on the beamforming under the condition of low signal-to-noise ratio. In the underwater acoustic environment, the line spectrum feature enhancement of the distorted towed array is realized. In order to verify the effectiveness of this method, this embodiment uses figure 1 Take the distorted towed array as an example to obtain the line spectrum features of the tracking target. In an ideal array, the array elements are arranged in a straight line at equal intervals. Such as figure 1 As shown, the array elements of the distortion array in this embodiment are arranged as shown in the hollow circles in the figure, including 64 array elements, that is, M=64, and there is a slight difference in the array element spacing. In this embodiment, t...

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Abstract

The invention discloses a line spectrum feature enhancement method and system based on a phase gradient error estimation technology. The method comprises the following steps: 1, obtaining an observation array signal; 2, roughly estimating a target orientation based on ideal array beam forming; 3, performing conventional beam forming processing based on the estimated target azimuth to obtain tracking beam data of the target direction, estimating a broadband continuous spectrum based on the data, and performing background equalization processing on the tracking beam data; 4, detecting L strong line spectrums of the target signal based on a threshold technology; and 5, eliminating linear time delay. And 6, estimating secondary and high-order time delay gradients between adjacent array elements based on the strong line spectrum after cyclic shift. And 7, carrying out gradient integration on the estimated time delay to obtain time delay estimation of each array element relative to the reference array element. And 8, based on the estimated delay compensation array signal delay inequality, obtaining a target tracking beam through conventional beam forming, and obtaining a fidelity enhanced line spectrum feature through Fourier transform. According to the invention, line spectrum feature enhancement under any array condition is realized.

Description

technical field [0001] The invention belongs to the technical field of sonar signal processing, in particular to a line spectrum feature enhancement method and system based on phase gradient error estimation technology. Background technique [0002] With the continuous improvement of ship noise reduction technology, the power of ship radiated noise is getting lower and lower, and the target detection based on single hydrophone is becoming more and more difficult. Compared with a single hydrophone, the hydrophone array can effectively improve the signal-to-noise ratio of the received signal, and can estimate the direction of arrival of the target accordingly, and has been widely used in underwater acoustic target detection and recognition. The towed linear array is currently the most widely used form of hydrophone array for underwater target detection. By increasing the aperture of the hydrophone array, it can effectively detect long-distance weak underwater targets, and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/539G01S15/66
CPCG01S7/539G01S15/66
Inventor 武其松聂文祥
Owner SOUTHEAST UNIV
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