Results 161 to 170 of about 1,552 (215)
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Application of the oblique ionogram as vertical ionogram
Science China Technological Sciences, 2012The vertical ionogram can provide the important ionospheric parameters, such as critical frequency, virtual height and electron density, for ionospheric research. The oblique ionosonde has the ability to detect the ionosphere over sea and other terrain where it is not practical to deploy vertical sounder and provide more ionograms with less ...
Gang Chen +2 more
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Radio Science, 2012 The paper describes a new simple method of calculation by which an artificial ionogram trace is obtained from a given vertical electron density profile. The method is discussed in terms of the target function method used by Autoscala to output a reliable
M Pezzopane, Bruno Zolesi
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Ionogram height–time–intensity observations of descending sporadic E layers at mid-latitude
Journal of Atmospheric and Solar-Terrestrial Physics, 2006 A new methodology of ionosonde height–time–intensity (HTI) analysis is introduced which allows the investigation of sporadic E layer (Es) vertical motion and variability.
C Haldoupis, C Meek, D Pancheva
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Automatic classification of ionogram with CNN
2020 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-Taiwan), 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. In this paper, a method based on CNN is proposed to classify the ionograms automatically.
Wei-Yi Cheng +3 more
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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
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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
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Automatic Trace Recognition of Ionogram with YOLOv3
2020 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-Taiwan), 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 ionospheric irregularities effectively.
Tai-Yuan Gong +3 more
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Noise removal in ionograms by neural network
Neural Computing & Applications, 1997A neural network approach to the extraction of 1hop F-layer traces from oblique-incidence ionograms is shown to offer performance at least comparable with conventional filtering techniques. Preprocessing in the form of background noise and vertical (horizontal) line removal is utilised prior to training a 110∶7∶100 MLP using backpropagation with ...
Markus Hagenbuchner, John Fulcher
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2017
This chapter explores how the Alouette satellite’s reorientation of global data flows and mass-production of ionograms altered the natural order at the core of DRTE’s research. The satellite’s unexpected reliability demanded an automated system of data analysis.
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This chapter explores how the Alouette satellite’s reorientation of global data flows and mass-production of ionograms altered the natural order at the core of DRTE’s research. The satellite’s unexpected reliability demanded an automated system of data analysis.
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Journal of Atmospheric and Terrestrial Physics, 1978
Abstract The simulations of trough ionograms by Lobb and Titheridge (1977) are supplemented by calculating a trace caused by rays having a double oblique reflection in the ionosphere and not retracing their paths. It is also shown how the different parts of the traces are caused by echoes of different types.
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Abstract The simulations of trough ionograms by Lobb and Titheridge (1977) are supplemented by calculating a trace caused by rays having a double oblique reflection in the ionosphere and not retracing their paths. It is also shown how the different parts of the traces are caused by echoes of different types.
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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
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