Robust Computerized Ionospheric Tomography Based on Spaceborne Polarimetric SAR Data
Robust Computerized Ionospheric Tomography Based on Spaceborne Polarimetric SAR Data
复制标题
基于星载偏振SAR数据的鲁棒计算机电离层层析成像
DOI：
10.1109/jstars.2017.2703098
复制
发表时间：
2017-05
影响因子：
5.5
通讯作者：
Haisheng Zhao
中科院分区：
文献类型：
--
作者：
Cheng Wang;Liang Chen;Lu Liu;Jian Yang;Zheng Lu;Jian Feng;Haisheng Zhao
由于电离层的色散特性，与 L 波段以上的频率相比，L 或更低频率的星载极化合成孔径雷达 (PolSAR) 系统通常会受到更严重的影响。相应地，根据电离层破坏PolSAR数据散射矩阵的机制，可以通过模型反演反演计算机电离层层析成像（CIT）的重要输入总电子含量（TEC）。为此，本文提出了一种基于星载PolSAR数据的CIT技术。 CIT技术是从TEC值获取电离层电子密度空间分布的一种手段。由于星载SAR具有较高的空间分辨率，通过PolSAR数据可以获得以前无法获得的千米级TEC信息。因此可以获得高分辨率的电离层电子密度空间分布。此外，以往基于SAR成像信息的CIT的潜在局限性是难以要求场景中具有高信杂比（SCR）比的强点目标。相比之下，基于散射矩阵信息的CIT重建可以很容易地实现，而不需要上述特殊要求。本文利用先进陆地观测卫星（ALOS）相控阵L波段合成孔径雷达（PALSAR）全极化数据、国际参考电离层（IRI）2007和国际地磁参考场（IGRF）模型的模拟数据，首先模拟了电离层电子密度分布的重建，验证了该技术的可行性。然后，还模拟分析了SAR系统和模型误差对重建结果可能产生的影响，以表明其适用性。
Due to the dispersion nature of the ionosphere, the spaceborne polarimetric synthetic aperture radar (PolSAR) systems at L or lower frequencies will generally experience more severe effects in comparison to frequencies above L-band. Correspondingly, according to the mechanism of how ionosphere destroys the scattering matrix of PolSAR data, the total electron content (TEC), an important input in computerized ionospheric tomography (CIT), can be retrieved by model inversion. Thus, this paper presents a technique of CIT based on the spaceborne PolSAR data. The CIT technique is a means to obtain the spatial distribution of ionospheric electron density from the TEC values. Because of the high spatial resolution of spaceborne SAR, the kilometer-scale TEC information can be obtained by the PolSAR data where such resolution was previously inaccessible. The spatial distribution of ionospheric electron density with high resolution can therefore be obtained. In addition, the potential limitation of previous CIT based on SAR imaging information is the difficulty in requiring strong point targets with high signal-to-clutter (SCR) ratio in scenes. In contrast, the CIT reconstruction based on scattering matrix information can be easily realized without aforementioned special requirements. In this paper, by using the simulated data of the Advanced Land Observing Satellite (ALOS) Phased-Array L-band Synthetic Aperture Radar (PALSAR) full-pol data, the International Reference Ionosphere (IRI) 2007, and the International Geomagnetic Reference Field (IGRF) models, the reconstruction of ionospheric electron density distribution is first simulated to validate the feasibility of the proposed technique. Then, possible effects of SAR system and model errors on the reconstruction results are also simulated and analyzed to show the applicability.
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影响因子：
8.2
作者：
F. Meyer
通讯作者：
F. Meyer
DOI：
10.1029/rs023i003p00299
发表时间：
1988-05
期刊：
--
影响因子：
--
作者：
J. Austen
通讯作者：
J. Austen
影响因子：
2.6
作者：
Lianlin Li;Fang Li
通讯作者：
Lianlin Li;Fang Li
影响因子：
5.2
作者：
J. Maeda;T. Suzuki;M. Furuya;K. Heki
通讯作者：
J. Maeda;T. Suzuki;M. Furuya;K. Heki
影响因子：
2.8
作者：
Finlay, C. C.;Maus, S.;Zvereva, T. I.
通讯作者：
Zvereva, T. I.