Total electron content (TEC) forecasting by Cascade Modeling: A possible alternative to the IRI-2001

Date

2008-08-27

Author

Senalp, Erdem Turker
Tulunay, Ersin
Tulunay, Yurdanur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

120
views

0
downloads

The ionospheric parameter, total electron content (TEC)is one of the key parameters in navigation and telecommunication applications. A small group at METU in Ankara has been developing data driven models in order to forecast the ionospheric parameters since 1990. In particular, results on forecasting TEC values one hour in advance by using their Neural Network Model - METU-NN have been reported previously. Since then, some work has been done in order to increase the performance of the METU-NN. In this paper, the most recent advanced model of the Neural Network containing Cascade Modeling (METU-NN-C) based on the Hammerstein systems is introduced. To demonstrate the performance of the METU-NN-C model, the Chilbolton and the Hailsham TEC values are considered during severe Space Weather conditions in some periods of 2001 and 2002. The authors have considered the METU-NN-C model as an alternative to the IRI-2001. In order to facilitate a comparison, IRI-2001 Hailsham TEC values are compared with those of the METU-NN- C by taking observed values as a basis.

Subject Keywords

Electrical and Electronic Engineering, General Earth and Planetary Sciences, Condensed Matter Physics

URI

https://hdl.handle.net/11511/57834

Journal

RADIO SCIENCE

DOI

https://doi.org/10.1029/2007rs003719

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Sectorized approach and measurement reduction for mutual coupling calibration of non-omnidirectional antenna arrays Aksoy, Taylan; Tuncer, Temel Engin (American Geophysical Union (AGU), 2013-03-01) Mutual coupling calibration is an important problem for antenna arrays. There are different methods proposed for omnidirectional antennas in the literature. However, many practical antennas have non-omnidirectional (NOD) characteristics. Hence, the previous mutual coupling calibration methods cannot be applied directly since the mutual coupling matrix of an NOD antenna array has angular dependency. In this paper, a sectorized approach is proposed with a transformation matrix for mutual coupling calibration ...
Modeling and synthesis of circular-sectoral arrays of log-periodic antennas using multilevel fast multipole algorithm and genetic algorithms Ergül, Özgür Salih (American Geophysical Union (AGU), 2007-06-19) Circular-sectoral arrays of log-periodic (LP) antennas are presented for frequency-independent operation and beam-steering capability. Specifically, nonplanar trapezoidal tooth LP antennas are considered in a circular array configuration, where closely spaced antennas occupy a sector of the circle. Electromagnetic interactions of the array elements, each of which is a complicated LP antenna structure, are rigorously computed with the multilevel fast multipole algorithm (MLFMA). Genetic algorithms (GAs) are ...
Frequency-based target localization methods for widely separated MIMO radar Kalkan, Yilmaz; Baykal, Buyurman (American Geophysical Union (AGU), 2014-01-01) Frequency-based localization methods are widely used to find emitter locations. Several techniques are described in the literature for emitter localization based on Doppler frequency shifts. These techniques can be used efficiently for emitter localization by using narrowband signals. Although these methods are simple and efficient, the application to the radar systems for target localization is very limited. In this paper, a new low-complexity target localization method, Target Localization via Doppler Fre...
Uniform and nonuniform V-shaped planar arrays for 2-D direction-of-arrival estimation Filik, T.; Tuncer, Temel Engin (American Geophysical Union (AGU), 2009-09-22) In this paper, isotropic and directional uniform and nonuniform V-shaped arrays are considered for azimuth and elevation direction-of-arrival (DOA) angle estimation simultaneously. It is shown that the uniform isotropic V-shaped arrays (UI V arrays) have no angle coupling between the azimuth and elevation DOA. The design of the UI V arrays is investigated, and closed form expressions are presented for the parameters of the UI V arrays and nonuniform V arrays. These expressions allow one to find the isotropi...
Performance of IRI-based ionospheric critical frequency calculations with reference to forecasting ÜNAL, İBRAHİM; Senalp, Erdem Turker; YEŞİL, ALİ; Tulunay, Ersin; Tulunay, Yurdanur (American Geophysical Union (AGU), 2011-01-27) Ionospheric critical frequency (foF2) is an important ionospheric parameter in telecommunication. Ionospheric processes are highly nonlinear and time varying. Thus, mathematical modeling based on physical principles is extremely difficult if not impossible. The authors forecast foF2 values by using neural networks and, in parallel, they calculate foF2 values based on the IRI model. The foF2 values were forecast 1 h in advance by using the Middle East Technical University Neural Network model (METU-NN) and t...

Citation Formats

E. T. Senalp, E. Tulunay, and Y. Tulunay, “Total electron content (TEC) forecasting by Cascade Modeling: A possible alternative to the IRI-2001,” RADIO SCIENCE, pp. 0–0, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57834.