Interference signal modulation recognition method for communication carrier monitoring system

Abstract

The invention discloses an interference signal modulation recognition method for a communication carrier monitoring system, and the method comprises the following steps: S1, carrying out the offline learning, constructing a cascaded ResNet neural network classifier, and carrying out the modulation type classification recognition of a generated two-dimensional signal analysis graph; building a full-connection BP network classifier to capture characteristic parameter information of the residual signal r; and S2, performing online learning, calculating and forming a two-dimensional signal analysis graph and cyclic spectrum statistical characteristic parameters of r, then inputting the two-dimensional signal analysis graph and the cyclic spectrum statistical characteristic parameters into thecascaded ResNet neural network and the full-connection BP network for modulation type classification and identification, and providing a final prediction result. The invention provides a neural network modulation recognition classifier based on parallel connection of the cascaded ResNet neural network and the full-connection BP neural network. Learning and mining structural features of a two-dimensional signal analysis graph of the interference signal are performed by the cascaded ResNet neural network; the full-connection BP neural network learns to mine cyclic spectrum parameter characteristics of the interference signals; and by combining the two neural networks for processing and judgment, the modulation recognition rate of interference signals is effectively improved.

Description

technical field [0001] The present invention relates to the technical field of satellite communication, and more specifically, to a method for identifying modulation of interference signals used in a communication carrier monitoring system. Background technique [0002] Satellite communication is easily affected by interference signals. The satellite carrier monitoring system provides support services for interference investigation and positioning by real-time detection of carrier signals transmitted by satellites and analysis of modulation types of interference signals. Although the time-frequency domain characteristics of the useful signal and the interference signal are usually quite different, the combination of the two types of signals will have a certain impact on the identification of their respective types. If a single type of signal modulation identification method is simply combined, the signal-to-noise When it is relatively low (for example, SNR=5dB), it usually l...

AI Technical Summary

Problems solved by technology

[0006] However, this method is not suitable for the actual application scenario of satellite communication interference signal modulation identification

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