Results 181 to 190 of about 5,624 (239)
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Deep-learning for ionogram automatic scaling
, 2020Scientists can study the global ionospheric weather by manually or automatically scaling ionograms recorded by global ionosondes to obtain characteristic values of D, E, F regions in the ionosphere.
Zhuowei Xiao +5 more
semanticscholar +1 more source
Automatic classification of ionogram with CNN
IEEE International Conference on Consumer Electronics, 2020The ionosphere is an essential part of the near-earth environment. Ionosphere classification, especially the irregularities identification via ionograms in real time has significant meaning in the ionospheric research.
Wei Cheng +3 more
semanticscholar +1 more source
Advances in Space Research, 1990
Abstract This report summarizes the availability of digital ionogram data from the USSR and the French ionosonde stations, and from the Digisonde 256 network. Both manually generated and automatically generated data are discussed.
B.W. Reinisch, A.Ya. Feldstein, H. Sizun
openaire +1 more source
Abstract This report summarizes the availability of digital ionogram data from the USSR and the French ionosonde stations, and from the Digisonde 256 network. Both manually generated and automatically generated data are discussed.
B.W. Reinisch, A.Ya. Feldstein, H. Sizun
openaire +1 more source
Automatic Trace Recognition of Ionogram with YOLOv3
IEEE International Conference on Consumer Electronics, 2020The correct trace identification of the ionosphere in ionograms is one of the fundamental steps to the automatic scaling of ionograms. In this paper, a new method based on deep learning network is proposed to identify the traces of ionograms and ...
Tai-Yuan Gong +3 more
semanticscholar +1 more source
Oblique and vertical incidence ionogram simulations with the presence of Es layer
, 2020The methodology making available an analysis of high frequency (HF) wave propagation in ionosphere with the presence of sporadic E layer (Es) is presented.
N. Zaalov, E. Moskaleva
semanticscholar +1 more source
A New Ionogram Automatic Scaling Method
Radio Science, 2018Ionograms generated by ionosondes contain significant information on the ionosphere. The scaling and inversion of the ionograms are important first steps for understanding the ionograms and monitoring the real‐time ionosphere.
Ziwei Chen +3 more
semanticscholar +1 more source
Backscatter ionogram inversion
2003 Proceedings of the International Conference on Radar (IEEE Cat. No.03EX695), 2004A backscatter ionogram, BSI, is a plot showing the group path or time delay against operating frequency when using ground-based swept frequency radar. In the case of ground backscatter, the received signals are reflected from distant locations on the Earth's surface.
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Automatic interpretation of oblique ionograms
Advances in Space Research, 2015Abstract We present an algorithm for the identification of trace characteristics of oblique ionograms allowing determination of the Maximum Usable Frequency (MUF) for communication between the transmitter and receiver. The algorithm automatically detects and rejects poor quality ionograms.
Alessandro Ippolito +4 more
openaire +1 more source
Radio Science, 1983
Automatic scaling of bottomside Digisonde ionograms gives the E and F region echo traces with high accuracy. Polarization and incidence angle information in the ionogram enables the extraction of the vertical, ordinary polarization echo trace from quiet as well as disturbed ionograms.
Bodo W. Reinisch, Huang Xueqin
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Automatic scaling of bottomside Digisonde ionograms gives the E and F region echo traces with high accuracy. Polarization and incidence angle information in the ionogram enables the extraction of the vertical, ordinary polarization echo trace from quiet as well as disturbed ionograms.
Bodo W. Reinisch, Huang Xueqin
openaire +1 more source
Progress in Electromagnetics Research Symposium, 2018
It is important that the electron density profile is estimated from the ionogram in the lower ionosphere. We have found a method obtained apparent heights of the ionogram from the electron density profile and the collision frequency profile.
Tetsuo Fukami, I. Nagano, R. Higashi
semanticscholar +1 more source
It is important that the electron density profile is estimated from the ionogram in the lower ionosphere. We have found a method obtained apparent heights of the ionogram from the electron density profile and the collision frequency profile.
Tetsuo Fukami, I. Nagano, R. Higashi
semanticscholar +1 more source