Browsing by Subject "Computerized ionospheric tomography"

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    ItemOpen Access
    Comparison of performances for computerized ionospheric tomography methods
    (2024-05-12) Yenen, Sinem Deniz; Arıkan, Feza; Arıkan, Orhan
    Solving the 3-D ionosphere electron density reconstruction prolem is of great importance for studying the effects of the ionosphere on signals. In this study, electron density tomography is performed for a midlatitude region using function-based methods available in the literature. The reconstructed electron density profiles are compared with the vertical electron density profiles of the ionosonde using comparison methods. The method with the most similar results to the ionosonde and the lowest computational complexity is decided.
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    ItemOpen Access
    Space weather studies of IONOLAB group
    (IEEE, 2016) Arıkan, F.; Sezen, U.; Toker, C.; Artuner, H.; Bulu, G.; Demir, U.; Erdem, E.; Arıkan, Orhan; Tuna, Hakan; Gulyaeva, T. L.; Karatay, S.; Mosna, Z.
    IONOLAB is an interdisciplinary research group dedicated for handling the challenges of near earth environment on communication, positioning and remote sensing systems. IONOLAB group contributes to the space weather studies by developing state-of-the-art analysis and imaging techniques. On the website of IONOLAB group, www.ionolab.org, four unique space weather services, namely, IONOLAB-TEC, IRI-PLAS-2015, IRI-PLAS-MAP and IRI-PLAS-STEC, are provided in a user friendly graphical interface unit. Newly developed algorithm for ionospheric tomography, IONOLAB-CIT, provides not only 3-D electron density but also tracking of ionospheric state with high reliability and fidelity. The algorithm for ray tracing through ionosphere, IONOLAB-RAY, provides a simulation environment in all communication bands. The background ionosphere is generated in voxels where IRI-Plas electron density is used to obtain refractive index. One unique feature is the possible update of ionospheric state by insertion of Total Electron Content (TEC) values into IRI-Plas. Both ordinary and extraordinary paths can be traced with high ray and low ray scenarios for any desired date, time and transmitter location. 2-D regional interpolation and mapping algorithm, IONOLAB-MAP, is another tool of IONOLAB group where automatic TEC maps with Kriging algorithm are generated from GPS network with high spatio-temporal resolution. IONOLAB group continues its studies in all aspects of ionospheric and plasmaspheric signal propagation, imaging and mapping.