Signal modulation type identification method and signal modulation type identification system

Abstract

The invention discloses a signal modulation type identification method and a signal modulation type identification system. The method comprises the following steps: preprocessing a signal to be identified, extracting a predetermined number of feature parameters, and using a feature vector formed by the predetermined number of feature parameters to represent the signal to be identified; using an optimal projection matrix to extract the features of the signal to be identified, and projecting the signal to be identified into a low-dimensional feature subspace, wherein the optimal projection matrix is obtained through a locality preserving projection algorithm; and calculating the Euclidean distance between the signal to be identified in the low-dimensional feature subspace and a training signal of which the signal modulation type is known, and determining the signal modulation type of the signal to be identified based on the nearest neighbor algorithm of Euclidean distance. According to the technical scheme, the signal to be identified is projected into the low-dimensional feature subspace by using the optimal projection matrix, which reduces the amount of calculation; and the optimal projection matrix obtained through the locality preserving projection algorithm reduces the deviation of the signal in the process of projection, and has better robustness and higher identification rate.

Description

technical field [0001] The invention relates to the technical field of signal identification, in particular to a signal modulation type identification method and system. Background technique [0002] The identification of signal modulation type is an intermediate step in signal interception and demodulation. It has important research value in both military and civilian fields, and is widely used in signal confirmation, interference identification, spectrum management, electronic countermeasures and other fields. In a complex electromagnetic environment, it is a very challenging task to realize the detection and reception of signals and form valuable communication intelligence, so as to provide the basis for subsequent identification, interference and other means. If the modulation method of the reconnaissance signal can be identified, less resources and costs can be used to interfere with specific signal parameters, achieving twice the result with half the effort. Tradition...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a modulation type identification method and system to solve the problems of poor robustness, unstable performance, and low identification rate under low signal-to-noise ratio conditions in the existing signal modulation identification technology in a non-cooperative communication system

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