Radar radiation source feature extraction and classification method based on variational mode decomposition

A variational modal decomposition and feature extraction technology, applied in the field of radar, can solve the problems of high electromagnetic signal density and complex system change, and achieve the effect of good separation between classes

Pending Publication Date: 2019-08-30
XIDIAN UNIV
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However, in today's electromagnetic environment, the density of electromagnetic signals is high, a

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  • Radar radiation source feature extraction and classification method based on variational mode decomposition
  • Radar radiation source feature extraction and classification method based on variational mode decomposition
  • Radar radiation source feature extraction and classification method based on variational mode decomposition

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[0027] The embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0028] (1) A method for extracting features of radar emitters based on variational modal decomposition, including the following steps:

[0029] Step 1. The reconnaissance receiver receives the high frequency pulse signal of the radar in real time, and preprocesses the high frequency pulse signal to obtain the preprocessed signal s(t).

[0030] Specifically, the preprocessing method in step 1 is: the high-frequency pulse signal is converted into an intermediate frequency pulse signal through a low-pass filter, and then the intermediate frequency pulse signal is amplified and matched filtered by a multi-stage intermediate frequency amplifier to obtain amplification After the inte...

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Abstract

The invention discloses a radar radiation source feature extraction and classification method based on variational mode decomposition, and the method comprises the steps of firstly, receiving a high-frequency pulse signal of a radar, carrying out the preprocessing of the high-frequency pulse signal, and obtaining a preprocessing signal; utilizing the digital channelization processing to generate apulse description word parameter of the pre-processed signal, and extracting an arrival angle and a pulse width in the pulse description word parameter; preprocessing the central frequency intra-pulse characteristics of the signals through a variational mode decomposition method, taking the central frequency intra-pulse characteristics as the supplement of conventional parameters, forming the characteristic parameters of a radar radiation source, and finally adopting a fuzzy-C means method to sort the radar radiation sources. The method can be used for classifying the frequency modulation type radar radiation sources, has the very good noise suppression capability, and can effectively improve the classification effect of the radar radiation sources under the low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a radar radiation source feature extraction and classification method based on variational mode decomposition in the field of electronic countermeasures, which is suitable for the classification of radar radiation sources under the condition of low signal-to-noise ratio. Background technique [0002] Radar radiation source identification is an important part of the electronic reconnaissance system. By intercepting, sorting, identifying and locating enemy radar radiation sources, it provides battlefield information and intelligence for one's own military operations, and radar reconnaissance obtains enemy intelligence. The quantity and quality of the battle will determine the direction of the battle. [0003] In order to ensure that the radar reconnaissance equipment has a high probability of intercepting the enemy's radiation source signal, the frequency domain wide open receiving ...

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Application Information

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IPC IPC(8): G06K9/00G06K9/62
CPCG06F2218/02G06F2218/08G06F2218/12G06F18/2321
Inventor 罗明付亮夏伟斯海飞
Owner XIDIAN UNIV
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