A New Analytical Model to Study the Ionospheric Effects on VHF/UHF Wideband SAR Imaging
A New Analytical Model to Study the Ionospheric Effects on VHF/UHF Wideband SAR Imaging
复制标题
研究电离层对 VHF/UHF 宽带 SAR 成像影响的新分析模型
DOI：
10.1109/tgrs.2017.2693396
复制
发表时间：
2017-05
影响因子：
8.2
通讯作者：
Lu Liu
中科院分区：
文献类型：
--
作者：
Cheng Wang;Liang Chen;Lu Liu
为了在全球范围内检测叶面遮挡/地面遮挡目标，低频（即，甚高频（VHF）/超高频（UHF）波段）和宽带宽是未来星载合成孔径雷达（SAR）系统设计的发展趋势。然而，由于电离层的色散，VHF/UHF宽带SAR信号不可避免地受到不利影响。与VHF/UHF波段窄带SAR相比，电离层二次和三次相位误差将对未来宽带SAR系统产生显著影响。传统的基于泰勒级数展开的评估模型在考虑极宽带宽时可能变得不准确。针对这一问题，本文首先简要讨论了电离层相位误差泰勒级数展开式的不足。基于Legendre正交多项式，提出了一种新的解析模型，该模型具有广泛的应用前景，尤其适用于低频宽带SAR系统。最后，通过与以往基于泰勒级数展开的模型进行比较，数值模拟和评价表明了新模型的优越性。
With a view to detecting foliage-obscured/ground-obscured targets on a global scale, low frequency (i.e., very high frequency (VHF)/ultrahigh frequency (UHF) band) and wide bandwidth is a trend in future spaceborne synthetic aperture radar (SAR) system design. However, due to the dispersion of ionosphere, VHF/UHF wide bandwidth SAR signals inevitably experience adverse effects. In contrast to narrow bandwidth SAR at VHF/UHF, quadratic and cubic ionospheric phase errors will introduce noticeable effects on future wide-bandwidth SAR systems. Traditional evaluation models based on Taylor series expansion may become inaccurate when an extremely wide bandwidth is considered. With a focus on this this issue, first, the shortcoming of Taylor series expansion of ionospheric phase errors is briefly discussed in this paper. Then, a new analytical model based on Legendre orthogonal polynomials is developed, which is expected to be widely applicable, especially for low-frequency and wide-bandwidth SAR systems. Finally, compared with previous models based on Taylor series expansion, numerical simulations and evaluations show the superiority of the new model.
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影响因子：
8.2
作者：
F. Meyer
通讯作者：
F. Meyer
各向异性电离层不规则性对星载SAR成像的影响
影响因子：
5.7
作者：
Cheng Wang, Min Zhang, Zheng-Wen Xu, Chun Chen, D
通讯作者：
Cheng Wang, Min Zhang, Zheng-Wen Xu, Chun Chen, D
DOI：
10.1007/bf02520897
发表时间：
1984-06
期刊：
Bulletin géodésique
影响因子：
--
作者：
G. Hartmann;R. Leitinger
通讯作者：
G. Hartmann;R. Leitinger
DOI：
10.1109/radar.2000.851943
发表时间：
2000-05
期刊：
Record of the IEEE 2000 International Radar Conference [Cat. No. 00CH37037]
影响因子：
--
作者：
K. Wheeler;S. Hensley
通讯作者：
K. Wheeler;S. Hensley
DOI：
10.1109/igarss.2000.858059
发表时间：
2000-07
期刊：
IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120)
影响因子：
--
作者：
L. Ulander;P. Frolind;A. Gustavsson;H. Hellsten;M. Herberthson;T. Jonsson;B. Larsson;G. Stenstrom
通讯作者：
L. Ulander;P. Frolind;A. Gustavsson;H. Hellsten;M. Herberthson;T. Jonsson;B. Larsson;G. Stenstrom