An ionospheric phase scintillation detection method based on nonlinear svm algorithm

Abstract

The present invention proposes an ionospheric phase scintillation detection method based on a nonlinear SVM algorithm. The method uses the nonlinear SVM algorithm in machine learning to judge the phase scintillation of the detected signal. The purpose of the SVM algorithm is to pass a given For samples with certain characteristics, find a hyperplane to classify the samples and apply them to new samples. In this process, the received GPS signal is first processed by high-pass filtering and calculated to obtain the maximum value and average value of the phase scintillation index, which is used as a learning sample to label the corresponding scintillation event, and set the label to 1 or ‑1 , indicating that the phase scintillation event has occurred or not, and then the samples are input into the nonlinear SVM classifier for learning, and the optimal classifier is obtained. When the new phase scintillation event feature vector enters the SVM classifier, it will be automatically classified. The detection method can classify a large number of scintillation events at the same time, and the use of nonlinear SVM algorithm improves the accuracy of the classification model.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an ionospheric phase scintillation detection technology based on a nonlinear SVM algorithm. Background technique [0002] With the development of the GPS system and the demand for higher positioning accuracy, the monitoring and research of ionospheric scintillation needs to be paid attention to and valued. Ionospheric scintillation is caused by the irregular structure in the ionospheric plasma, and refers to the rapid fluctuation of the amplitude and phase of the radio frequency signal propagating in the ionosphere. There are many reasons for this phenomenon, including but not limited to solar activity, magnetic storms, local electric fields, electrical conductivity, wave interactions, etc. The high-frequency occurrence areas of ionospheric scintillation are near the equator and the polar regions, and the amplitude scintillation and phase scintillation...

AI Technical Summary

Problems solved by technology

The most common ionospheric phase scintillation detection method is based on experience, by judging the phase scintillation index Whether it exceeds a certain threshold, if it exceeds the threshold, it is judged that phase flicker has occurred. Since this method is limited by the non-optimized empirical threshold, its accuracy needs to be improved

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