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Time-frequency analysis and tracking method for passive sonar target

A time-frequency analysis and target technology, applied in the direction of sound wave re-radiation, re-radiation utilization, and measurement devices, can solve the problems of unclear frequency information and achieve the effect of clear frequency information

Pending Publication Date: 2020-01-21
HAIYING ENTERPRISE GROUP
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Problems solved by technology

[0004] The purpose of the present invention is to provide a time-frequency analysis and tracking method for passive sonar targets, so as to solve the problem that the frequency information cannot be clearly defined in the current time-frequency analysis algorithm of random noise signals

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  • Time-frequency analysis and tracking method for passive sonar target
  • Time-frequency analysis and tracking method for passive sonar target
  • Time-frequency analysis and tracking method for passive sonar target

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Embodiment 1

[0044] The present invention provides a time-frequency analysis and tracking method for passive sonar targets, the process of which is shown in Figure 1, including: separately performing Fourier transform on each beam domain signal; superimposing the data after Fourier transform , to obtain a set of frequency domain data; according to the required frequency band requirements, select the corresponding spectral line data in the frequency domain data after Fourier transform; perform frequency domain time accumulation and smoothing processing; obtain the tracking orientation of the target spectrum, and then Tracking via Kalman filtering.

[0045] Fourier transform is performed on each signal of the multi-channel beam domain signal separately. The number of Fourier transform points is 4096 points, and the spectral line interval △F=7.8125Hz. It is assumed that the number of beam domain signals subjected to Fourier transform is 48. The data after the Fourier transform of each beam do...

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Abstract

The invention discloses a time-frequency analysis and tracking method for a passive sonar target, and belongs to the technical field of underwater acoustic signal detection. The method comprises the steps: independently carrying out the Fourier transform of each beam domain signal; carrying out the superposition of the data after Fourier transform, and obtaining a group of frequency domain data; selecting corresponding spectral line data from the data after Fourier transform according to the demands of a needed frequency band; carrying out the frequency domain time accumulation and smoothing processing; obtaining the tracking azimuth of an recorded target frequency spectrum, and carrying out the tracking through Kalman filtering. The method provided by the invention can obtain the frequency spectrum information with higher resolution, has more visual data in tracking display, enables the frequency information of a noise signal to be clearer, and provides more favorable data informationfor the subsequent target recognition and judgment.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic signal detection, in particular to a method for time-frequency analysis and tracking of a passive sonar target. Background technique [0002] Interference such as ocean environment noise and own ship noise constitutes a random noise field, while the noise of the target ship and the signals sent by its active sonar constitute the unknown random signal to be detected. The traditional random noise signal time-frequency analysis algorithm receives the beam domain signal after notch processing and azimuth normalization processing. The traditional noise signal time-frequency analysis mainly uses Fourier transform, line spectrum superposition and frequency domain time accumulation and smoothing processing; at the same time, it has a tracking function, which can obtain the azimuth change of the line spectrum in the frequency domain. [0003] The traditional noise signal time-frequency analysi...

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Application Information

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IPC IPC(8): G01S15/66
CPCG01S15/66Y02A90/30
Inventor 谢佳文刘超陈静侯晓迁崔立丹
Owner HAIYING ENTERPRISE GROUP
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