Three-dimensional ionospheric tomography by an improved algebraic reconstruction technique
Three-dimensional ionospheric tomography by an improved algebraic reconstruction technique
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DOI：
10.1007/s10291-007-0055-y
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发表时间：
2007-11-01
期刊：
影响因子：
4.9
通讯作者：
Zhang, Kefei
中科院分区：
文献类型：
--
作者：
Wen, Debao;Yuan, Yunbin;Zhang, Kefei
提出了一种改进的代数重建技术（IART），用于电离层电子密度（IED）的层析重建。该方法应用总电子含量（TEC）的测量，从一组先验IED分布反演IED的空间分布。在这种新方法中，松弛参数的数据驱动的调整进行，以提高计算效率和图像质量的经典代数重建技术（ART）。此外，新算法还结合电离层空间离散化技术简化了IED反演，并应用CHAMP掩星数据提高了垂直分辨率。数值模拟实验验证了该方法的可靠性。然后将其应用于从真实的GPS数据反演IED。反演结果表明，IART算法比传统ART算法具有更高的精度和效率。利用武汉站电离层资料验证了IART算法的可靠性。
An improved algebraic reconstruction technique (IART) is presented for the tomographic reconstruction of ionospheric electron density (IED). This method applies the total electron content (TEC) measurements to invert the spatial distribution of the IED from a set of apriori IED distributions. In this new method, a data-driven adjustment of the relaxation parameter is performed to improve the computation efficiency and image quality of the classical algebraic reconstruction technique (ART). In addition, the new algorithm is also combined with ionospheric space discretization technique to simplify the inversion of IED, and it applies CHAMP occultation data to improve the vertical resolution. A numerical simulation experiment is carried out to validate the reliability of the new method. It is then applied to the inversion of IED from real GPS data. Inverted results show that the IART algorithm has better accuracy and efficiency than the conventional ART algorithm. The reliability of the IART algorithm is also validated by ionosonde data recorded at Wuhan station.