A Radiation Source Signal Recognition Method Combining Two Domains and Multiple Features

A signal recognition and radiation source technology, applied in the field of information detection, can solve the problems of low recognition rate and weak generalization ability, and achieve the effect of improving recognition rate, enhancing generalization ability, and comprehensive feature information.

Active Publication Date: 2022-04-12
HARBIN ENG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to propose a radiation source signal modulation recognition method, which mainly solves the problems of weak generalization ability of existing recognition methods and low recognition rate under low signal-to-noise ratio in complex electromagnetic environments.

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  • A Radiation Source Signal Recognition Method Combining Two Domains and Multiple Features
  • A Radiation Source Signal Recognition Method Combining Two Domains and Multiple Features
  • A Radiation Source Signal Recognition Method Combining Two Domains and Multiple Features

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Embodiment Construction

[0121] The present invention will be further described below in conjunction with the accompanying drawings.

[0122] Step 1: Perform short-time Fourier transform on the radiation source signal sig(t) to obtain a time-frequency domain image, and denote the time-frequency domain image as TF 1 . The short-time Fourier transform formula is:

[0123]

[0124] In the formula, e is the Euler number, ζ(τ) is the window function, (·) * Indicates the conjugate operation, t represents time, f represents frequency, and τ is the integral variable.

[0125] Step 2: Perform an improved Wegener time-frequency distribution transformation on the radiation source signal to obtain a time-frequency domain image, and denote the time-frequency domain image as TF 2 . The improved Wegener time-frequency distribution transformation formula is:

[0126]

[0127] In the formula, (·) * Indicates conjugate operation, t is time, f is frequency, φ is frequency shift variable, is the time shift ...

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Abstract

The invention belongs to the field of information detection, and specifically relates to a radiation source signal identification method combining two domains and multiple features, comprising the following steps: performing short-time Fourier transform on the radiation source signal, improved Wigner time-frequency distribution transform and Greek Albert-Huang transform to obtain three kinds of time-frequency feature images; extract the Green single-channel images of three kinds of time-frequency feature images respectively, and carry out channel fusion of three kinds of Green single-channel images to obtain new feature images; the present invention adopts multi-time-frequency images A new three-dimensional time-frequency image is obtained by means of channel fusion. The linear time-frequency characteristics of the short-time Fourier transform response signal, the nonlinear time-frequency characteristics of the improved Wegener distribution response signal, the Hilbert-Huang transform is not restricted by the Heisenberg uncertainty principle, and has a good time Frequency resolution, the new three-dimensional time-frequency image obtained by channel fusion can more comprehensively represent the time-frequency information of the signal and improve the reliability of the system.

Description

technical field [0001] The invention belongs to the field of information detection, and in particular relates to a radiation source signal identification method combining two domains and multiple features. Background technique [0002] In a complex electromagnetic environment, the party that can obtain more information can gain more opportunities. Accurately identifying the modulation information of the radiation source is an important link in detection and identification. With the increasingly complex electromagnetic environment and modulation methods, the traditional radiation source signal identification technology has been unable to meet the needs of radiation source signal identification in practical applications. Therefore, it is very urgent and meaningful to find a new radiation source signal modulation identification method. . Existing radiation source signal identification includes manually extracting fixed feature parameters and using classifiers to identify them,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06N3/04G06N3/08
CPCG06N3/08G06N3/045G06F2218/08G06F2218/12
Inventor 高敬鹏王旭綦俊炜项建弘郑凯元白锦良秦鹏江志烨
Owner HARBIN ENG UNIV
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