Preprocessing method of electronic reconnaissance signals based on VMD (Variational Mode Decomposition) algorithm

Abstract

The invention relates to a preprocessing method of electronic reconnaissance signals based on a variational mode decomposition (VMD) algorithm, which comprises the steps of calculating the center frequency of a real-time electronic reconnaissance frequency domain signal by using a sampling frequency, then obtaining an update formula of three frequency domain signal parameters according to the VMDalgorithm, updating pulse signals of each channel, the center frequency of each channel and a Lagrange multiplier by using the update formula of the three parameters, and finally acquiring a preprocessed electronic reconnaissance pulse signal. The method overcomes a problem of pulse overlapping and loss caused by uniform selection of the channel center frequency of the electronic reconnaissance signal in the prior art, and enables the decomposition accuracy of the electronic reconnaissance pulse signal. The method simplifies the signal decomposition steps, has high signal decomposition efficiency and reduces the time complexity of the electronic reconnaissance pulse signal required to be processed.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to an electronic reconnaissance signal preprocessing method based on a variational mode decomposition VMD (Variational Mode Decomposition) algorithm in the technical field of radar signal processing. The present invention can be used in electronic reconnaissance, electronic support and threat warning systems, and non-uniformly decomposes received electronic reconnaissance pulse signals to facilitate further extraction of pulse signal time-frequency domain characteristics for analyzing target information in the direction of pulse incoming wave. Background technique [0002] Electronic reconnaissance pulse signal preprocessing is an important part of radar electronic countermeasures, and plays an important role in electronic support and threat warning systems. Channelization processing is one of the important components of electronic reconnaissance preprocessing. It divide...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the use of uniform channelization to process electronic reconnaissance pulse signals will cause overlapping and loss of frequency domain signals, and the accuracy is not high when processing complex electronic reconnaissance pulse signals

The disadvantage of this method is that when preprocessing the electronic reconnaissance pulse signal, the received signal is compared with the constructed intermediate frequency signal to decompose the electronic reconnaissance pulse signal. high

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