Recovery of ionospheric signals using fully convolutional densenet and its challenges

Merlin M. Mendoza, Yu Chi Chang, Alexei V. Dmitriev, Chia Hsien Lin, Lung Chih Tsai, Yung Hui Li, Mon Chai Hsieh, Hao Wei Hsu, Guan Han Huang, Yu Ciang Lin, Enkhtuya Tsogtbaatar

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

The technique of active ionospheric sounding by ionosondes requires sophisticated methods for the recovery of experimental data on ionograms. In this work, we applied an advanced algorithm of deep learning for the identification and classification of signals from different iono-spheric layers. We collected a dataset of 6131 manually labeled ionograms acquired from low-latitude ionosondes in Taiwan. In the ionograms, we distinguished 11 different classes of the signals according to their ionospheric layers. We developed an artificial neural network, FC-DenseNet24, based on the FC-DenseNet convolutional neural network. We also developed a double-filtering algorithm to reduce incorrectly classified signals. That made it possible to successfully recover the sporadic E layer and the F2 layer from highly noise-contaminated ionograms whose mean signal-to-noise ratio was low, SNR = 1.43. The Intersection over Union (IoU) of the recovery of these two signal classes was greater than 0.6, which was higher than the previous models reported. We also identified three factors that can lower the recovery accuracy: (1) smaller statistics of samples; (2) mixing and overlapping of different signals; (3) the compact shape of signals.

原文???core.languages.en_GB???
文章編號6482
期刊Sensors (Switzerland)
21
發行號19
DOIs
出版狀態已出版 - 1 10月 2021

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