A method for detecting objects in water
A detection method and a technology for underwater targets, which are applied in the field of target detection, can solve problems such as the impact of detection results, and achieve the effects of avoiding interference, no need for prior information, and long detection distances
Active Publication Date: 2022-07-05
NORTHWESTERN POLYTECHNICAL UNIV
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From the perspective of frequency and energy distribution, Zhang Xiaoyong et al. derived the expressions of the instantaneous frequency distribution and energy distribution that the narrowband signal and the wideband signal satisfy at the same time on the basis of the homeopathic frequency variance detector. There is a frequency center with relatively concentrated energy. This feature is described by instantaneous frequency analysis, and the target detection using the continuum of ship radiation noise is realized. However, the detection results of this energy-based detection method will be affected at long distances. greater impact
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[0020] The technical scheme adopted by the present invention to solve its technical problem comprises the following steps:
[0021] Step 1, use sonar to collect the acoustic signal a(t) in the ocean, in order to make its variance become 1, process the acoustic signal a(t) to obtain the input signal Among them, N represents the number of data received at the initial moment, i=1, 2, 3, ..., N; the value of N is not less than 2000.
[0022] Step 2: Perform phase space reconstruction on the collected data according to the Takens reconstruction theorem:
[0023] Using the data of the received acoustic signal, use the G-P algorithm to obtain the reconstruction dimension and time delay of the data, and finally complete the phase space reconstruction of the received data:
[0024] S(t i )=[s(t i ),s(t i +τ),s(t i +2τ),…,s(t i +(m-1)τ)]
[0025] where s(t i ) represents the input signal, S(t i ) represents the reconstructed signal, τ is the delay time, and m is the reconstruc...
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The invention provides an underwater target detection method, which combines the needs of nonlinear characteristic characterization under complex marine environment and uses the relative expansion entropy analysis method to analyze the relative change of two different asymptotic exponential rate differences of the received data, and analyze the relative change of the rate difference of the received data. Characterizing the degree of change can effectively avoid the interference caused by the energy fluctuation of the environmental noise itself. Therefore, using this method to detect underwater targets can achieve long-distance detection of underwater targets without prior information, and has the advantages of long detection distance and no prior information.
Description
technical field [0001] The invention relates to the technical field of underwater acoustic signal processing, in particular to a target detection method. Background technique [0002] In order to cope with the new opportunities and challenges brought by the "ocean century" and further revitalize the marine industry, we must focus on the development of marine science and technology in accordance with the strategic thinking of building a powerful marine country, and improve our country's coastal defense strength, and underwater target detection is the field of marine security. an important research direction. [0003] The most commonly used detection methods for long-distance targets in water is line spectrum detection. The commonly used methods in line spectrum detection include autocorrelation detection method, fast Fourier transform method, adaptive line spectrum enhancement method, etc., but many of these methods need to be obtained. Line spectrum frequency and other prio...
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IPC IPC(8): G01S15/04G01S7/539
CPCG01S15/04G01S7/539
Inventor 王海燕张红伟董海涛马石磊申晓红
Owner NORTHWESTERN POLYTECHNICAL UNIV