A Line Spectrum Recognition Method of Moving Target Based on Frequency-Energy Fluctuation Characteristics
A target line spectrum and recognition method technology, applied in the field of moving target line spectrum recognition based on frequency-energy fluctuation characteristics, can solve problems such as difficulty in distinguishing line spectrum sources, target signal detection and classification recognition problems, and inability to determine line spectrum information, etc. , to achieve the effect of good engineering practical value
Active Publication Date: 2021-11-09
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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In the actual work process, passive omnidirectional sonobuoys and submersible buoys can perceive a large amount of line spectrum information, and it is difficult to distinguish the source of line spectrum without prior knowledge, let alone determine which line spectrum information is the target of interest. It has brought great trouble to target signal detection and classification recognition
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[0039] Embodiment: As shown in the accompanying drawings, this method of line spectrum recognition of moving targets based on frequency-energy fluctuation characteristics mainly includes the following steps:
[0040] 1) High-resolution low-frequency LOFAR spectrum analysis, that is, perform FFT analysis on the received time-domain signal to obtain the target LOFAR spectrum analysis result;
[0041] 2) Line spectrum feature extraction, that is, extracting the target LOFAR line spectrum, and using the maximum line spectrum recursive tracking method to obtain the target line spectrum feature;
[0042] 3) Calculation of the line spectrum fluctuation degree, that is, calculating the line spectrum fluctuation degree representing the frequency-energy fluctuation characteristic of the target line spectrum;
[0043] 4) Line spectrum recognition of moving targets.
[0044] High-resolution low-frequency LOFAR spectrum analysis is mainly to receive passive omnidirectional buoy or submers...
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The invention discloses a moving target line spectrum recognition method based on frequency-energy fluctuation characteristics, which mainly includes high-resolution low-frequency LOFAR spectrum analysis, line spectrum trace feature extraction, line spectrum fluctuation degree calculation, and moving target line spectrum recognition. The present invention starts from the characteristics of the line spectrum of the moving target, that is, the line spectrum of the moving target has a certain fluctuation near a certain frequency and its energy also fluctuates with time, and proposes to use the degree of fluctuation of the line spectrum to characterize the frequency-energy of the line spectrum of the moving target Based on the linear discriminant function, the line spectrum recognition of moving targets can be effectively realized, and the line spectrum of moving targets can be better distinguished, which provides a good feature basis for target detection and classification recognition. It can effectively distinguish the moving target line spectrum among the many acquired line spectra; it can be used in passive omnidirectional buoy and submerged buoy target detection and classification recognition, and has good engineering practical value.
Description
technical field [0001] The invention relates to the field of underwater acoustics and underwater acoustic signal target detection and recognition, in particular to a moving target line spectrum recognition method based on frequency-energy fluctuation characteristics. Background technique [0002] Underwater acoustic targets contain rich line spectrum components in the low frequency band. These line spectra are often important features for target detection and identification. At the same time, these low frequency line spectra are often relatively stable and have a long transmission distance. Some of these line spectra do not change with the working conditions. Or the change is small, and part of it changes with the working conditions. The line spectrum that has nothing to do with the working condition or weak correlation can be used as the inherent invariant feature of the underwater acoustic target, and the line spectrum that changes with the working condition can be used as ...
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IPC IPC(8): G01S15/50G01S15/88
CPCG01S15/50G01S15/88
Inventor尚金涛杨柳
OwnerTHE 715TH RES INST OF CHINA SHIPBUILDING IND CORP