Radio tomography of the ionosphere: Analysis of an underdetermined, ill-posed inverse problem, and regional application
Radio tomography of the ionosphere: Analysis of an underdetermined, ill-posed inverse problem, and regional application
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DOI：
10.1029/2007rs003714
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发表时间：
2008-04-26
期刊：
影响因子：
1.6
通讯作者：
Crespon, F.
中科院分区：
文献类型：
--
作者：
Garcia, R.;Crespon, F.
本文在分析了无线电层析成像的正、逆问题后，提出了一种利用GPS倾斜TEC数据进行电离层时变三维成像的方法，并在区域尺度上进行了应用。我们的方法是基于局域基参数化的电子密度，并约束NeQuick电离层模型及其空间梯度。我们的反演方案是从根本上不同的数据同化方法，因为它不是基于物理电离层模型。与欧洲GPS接收机数据获得的初步结果验证了我们的方法，它是能够检索小尺度电离层功能在适当解决的卷的稳定性。在算法上仍有许多改进的可能，并且仍然需要通过独立数据对反演模型进行仔细验证。然而，我们的反演算法，以改善粗糙的先验电离层模型的小尺度功能的确定。
After analysing the forward and inverse problems of radio tomography, a time varying three-dimensional imaging method of the ionosphere from GPS slant TEC data is described and applied at regional scale. Our approach is based on local basis parametrisation of electron density, and constrained by NeQuick ionosphere model and its spatial gradients. Our inversion scheme is fundamentally different from the data assimilation approach because it is not based on a physical ionosphere model. Preliminary results obtained with European GPS receiver data validate the stability of our method which is able to retrieve small-scale ionosphere features in properly resolved volumes. Many improvements are still possible on the algorithm, and a careful validation of inverted models by independent data is still necessary. However, our inversion algorithm is shown to improve the determination of the small-scale features of a coarse a priori ionosphere model.