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      • Department of Electrical and Electronics Engineering
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      Tomographic reconstruction of the ionospheric electron density as a function of space and time

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      Author
      Erturk, O.
      Arıkan, Orhan
      Arikan, F.
      Date
      2009
      Source Title
      Advances in Space Research
      Print ISSN
      0273-1177
      Publisher
      ELSEVIER
      Volume
      43
      Issue
      11
      Pages
      1702 - 1710
      Language
      English
      Type
      Article
      Item Usage Stats
      139
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      134
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      Abstract
      Electron density distribution is the major determining parameter of the ionosphere. Computerized Ionospheric Tomography (CIT) is a method to reconstruct ionospheric electron density image by computing Total Electron Content (TEC) values from the recorded Global Positioning Satellite System (GPS) signals. Due to the multi-scale variability of the ionosphere and inherent biases and errors in the computation of TEC, CIT constitutes an underdetermined ill-posed inverse problem. In this study, a novel Singular Value Decomposition (SVD) based CIT reconstruction technique is proposed for the imaging of electron density in both space (latitude, longitude, altitude) and time. The underlying model is obtained from International Reference Ionosphere (IRI) and the necessary measurements are obtained from earth based and satellite based GPS recordings. Based on the IRI-2007 model, a basis is formed by SVD for the required location and the time of interest. Selecting the first few basis vectors corresponding to the most significant singular values, the 3-D CIT is formulated as a weighted least squares estimation problem of the basis coefficients. By providing significant regularization to the tomographic inversion problem with limited projections, the proposed technique provides robust and reliable 3-D reconstructions of ionospheric electron density.
      Keywords
      Computerized ionospheric tomography (CIT)
      Ground positioning satellites (GPS)
      Ionosphere
      Ionospheric reconstruction
      Occultation data
      Singular value decomposition (SVD)
      Voxelization
      Permalink
      http://hdl.handle.net/11693/22727
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.asr.2008.08.018
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