Underwater AUV detection method for adaptive matching stochastic resonance

A technology of adaptive matching and stochastic resonance, which is applied to computer components, pattern recognition in signals, complex mathematical operations, etc., can solve problems such as difficult engineering implementation, poor adaptability to the actual environment, low signal-to-noise ratio, etc., and achieve enhanced output , The effect of improving signal energy and local signal-to-noise ratio

Active Publication Date: 2018-11-23
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

Scale transformation uses the idea of ​​spectrum shifting to move high-frequency signals to low frequencies, but in the process of processing high-frequency signals, it is necessary to design a suitable filter to preprocess the signal, and the effect of resonance often depends on the design of the filter , poor adaptability to the actual environment
[0007] At present, it is difficult to detect small ta...

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  • Underwater AUV detection method for adaptive matching stochastic resonance
  • Underwater AUV detection method for adaptive matching stochastic resonance
  • Underwater AUV detection method for adaptive matching stochastic resonance

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0029] Concrete steps of the present invention are as follows:

[0030] Step 1: Receive signal preprocessing

[0031] For the received time-domain signal, the time-domain whitening processing method is used, and it can be calculated by formula (1):

[0032] r white (n)=r(n+m)-r(n) (1)

[0033] Among them, r white (i) is the whitened signal, r is the received signal, n=0,1,2,... is the sampling point sequence number, and m is the number of sampling points at intervals;

[0034] Step 2: Noise Strength Estimation

[0035]The maximum likelihood estimation method is used to estimate the noise intensity, that is, the variance when there is only noise input, which can be calculated by formula (2):

[0036]

[0037] in, is the variance of the noise, N is the number of si...

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Abstract

The invention provides an underwater AUV detection method for adaptive matching stochastic resonance, comprising the following steps: whitening a received time domain signal, establishing a second-order nonlinear bistable stochastic resonance system, and implementing the noise matching and frequency matching by optimizing a output signal-to-noise ratio gain measure and synchronous gramer escape rate; according to a set step size, selecting a maximum signal-to-noise ratio as an optimal matching value, and extracting a corresponding signal frequency as a target characteristic line spectrum frequency; and using the work kurtosis as a test statistic to determine whether the signal is present or not. According to the underwater AUV detection method for the adaptive matching stochastic resonance, signal energy and a local signal-to-noise ratio at a target characteristic line spectrum can be greatly improved, and an output of a characteristic signal in completely submerged noise can be obviously enhanced.

Description

technical field [0001] The invention relates to the field of underwater target detection and signal detection, in particular to a weak signal detection method. Background technique [0002] In recent years, research on passive detection of small underwater targets such as surface boats and underwater unmanned vehicles (AUVs) has gradually become a new research hotspot in the field of underwater information at home and abroad. Compared with traditional surface ships and submarines, the new underwater unmanned vehicle has the advantages of small size and low noise. With the advanced acoustic stealth technology and the increasing demand for the detection radius of underwater early warning systems in the new era, the ability of traditional methods to perceive and extract key features of such emerging weak and small targets in water is facing new challenges. [0003] In the field of signal detection, the stochastic resonance weak signal detection method has attracted the attenti...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06F17/11G01V1/28
CPCG06F17/11G01V1/28G06F2218/02G06F2218/08G06F2218/12
Inventor 王海燕董海涛马石磊申晓红锁健
Owner NORTHWESTERN POLYTECHNICAL UNIV
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