Method of extracting weak target signal in ocean current interference

A weak target and signal extraction technology, which is applied to measuring devices, instruments, special recording/indicating devices, etc., can solve problems such as difficulty in extracting weak target signals

Active Publication Date: 2016-08-03
BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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Problems solved by technology

It is very difficult to extract weak target signals from complex ocean electromagnetic interference. Due to the limitation of data extraction, processing and analysis capabilities, it has only stayed at the theoretical stage for a long time. It is necessary to continuously explore and research new mechanisms and new methods.

Method used

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  • Method of extracting weak target signal in ocean current interference
  • Method of extracting weak target signal in ocean current interference
  • Method of extracting weak target signal in ocean current interference

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Embodiment

[0067] Embodiment: As shown in Figure 2 (a), we test the data detected by the magnetic field collection antenna in the real ocean environment, including ocean disturbances, changes in the geomagnetic field, power frequency signals, high-frequency noise of instruments, and the passing of a small moving target. Perturbation, corresponding to f in step (1) 0i ; Fig. 2 (b) is the signal after removing the high-frequency noise of the instrument and power frequency interference, corresponding to f in the step (2) 1i .

[0068] like Figure 3(a) , 3(b) , 3(c) and 3(d), showing a in step (5) * and b * Calculation method, as shown in Figure 3 (a) take a=0.01, b=0.02, Figure 3 (b) take a=0.02, b=0.05, Figure 3 (c) take a=0.01, b=0.02, Figure 3 ( d) Take a=0.02, b=0.01, through the comparison of the above four typical data and figures, we can know that in this moving target, a=0.02, b=0.01 is the optimal result, as shown in Figure 3(d) The result corresponds to f in step (5) 2i . ...

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Abstract

The invention provides a method of extracting a weak target signal in ocean current interference. The method comprises the following steps: ocean magnetic field variation information f0i is acquired; multi-scale decomposition is carried out on the f0i to obtain a signal f1i; a stochastic resonance method is adopted for the f1i; a fourth-order Runge-Kutta method is used for high-accuracy numerical value solution on a nonlinear stochastic resonance system; optimal stochastic resonance parameters are found out; the best resonance output data sequence f2i is solved; multi-scale decomposition is carried out on the f2i; different thresholds are selected in a main frequency band interval where the target signal is to rebuild a signal f3i through threshold processing; feature extraction is carried out on the f3i; and extracted feature parameters are matched and compared with a database for underground target motion. Abnormal target disturbance magnetic field features are screened from complex ocean background electromagnetic interference, a passing underwater moving target can be indirectly detected, discovered and recognized, and the underwater prediction and early warning ability can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of underwater moving target detection, and in particular relates to the extraction and identification of underwater moving target signals by using stochastic resonance and wavelet analysis technology. Background technique [0002] The detection and location of underwater moving targets has always been a concern in both civilian and military fields. For different underwater moving targets in different environments, various detection methods have their own advantages and disadvantages. For example, the most basic method at present is sonar detection, but it has a high false alarm rate and is very limited in detecting targets in the ocean. Optical detection technology is vulnerable to harsh environmental meteorological conditions. Magnetic field anomaly detection technology is less affected by the environment and can make up for the detection blind spots left by other detection technologies, but the detection...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/032
CPCG01D3/032
Inventor 易忠张绍华孟立飞王斌唐小金代佳龙张超
Owner BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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