Reconstruction of nonmonotonic height profiles of electron density from vertical sounding ionograms by the regularization method

Beloff, N, Denisenko, P F and Gough, M P (2002) Reconstruction of nonmonotonic height profiles of electron density from vertical sounding ionograms by the regularization method. Radio Science, 37 (4). pp. 1057-1064. ISSN 0048-6604

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Abstract

The problem of reconstruction of daytime nonmonotonic height profiles of electron density N(h) from ionograms of ground-based vertical sounding is considered. The regularization (REG) scheme has been proposed for determination of valley parameters. A comparison of the least squares method (LSM) with the regularization (REG) scheme was carried out using computer simulations. It is shown that LSM results are very sensitive to random errors in virtual heights. This fact leads to an unpredictably large deviation of the reconstructed N(h) profile from the real one. The application of REG methods makes the results more stable to random errors in measurements and allows us to decrease the deviation of the restored real height and valley depth from their model values by several times in comparison with LSM results.

Item Type: Article
Additional Information: A challenging problem of reconstruction of daytime non-monotonic height profiles of electron density N(h), or so called "valley problem" was discussed in this paper. It is shown that traditional Least Squares Method approach gives the results that are very sensitive to random errors in virtual heights. This fact leads to an unpredictably large deviation of the reconstructed N(h) profile from the real one. The application of Regularization technique allows obtaining significantly more reliable results. Such reconstructions will be very useful for Global Ionospheric Model corrections and will improve the accuracy of Global Positioning Systems.
Schools and Departments: School of Engineering and Informatics > Informatics
Depositing User: Natalia Beloff
Date Deposited: 06 Feb 2012 20:43
Last Modified: 25 May 2012 07:55
URI: http://sro.sussex.ac.uk/id/eprint/27752
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