Ionospheric Polarimetric Dispersion Effect on Low-Frequency Spaceborne SAR Imaging

被引：22
|
作者：
Li, Li [1 ]
Zhang, Yongsheng [1 ]
Dong, Zhen [1 ]
Liang, Diannong [1 ]
机构：
[1] Natl Univ Def Technol, Sch Elect Sci & Engn, Inst Space Elect & Informat Technol, Changsha 410073, Hunan, Peoples R China
来源：
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS | 2014年 / 11卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Ionosphere; polarimetric dispersion (PD); synthetic aperture radar (SAR) imaging; FARADAY-ROTATION; BAND SAR; RESOLUTION;
D O I：
10.1109/LGRS.2014.2323232
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Ionospheric Faraday rotation (FR) introduces polarimetric distortion to trans-ionosphere signals. Spaceborne low-frequency wide-bandwidth synthetic aperture radar (SAR) signals may be distorted by FR effect because it is highly dispersive. Ionospheric polarimetric dispersion (PD) effects on spaceborne SAR imaging are modeled and analyzed. PD effect is included in polarimetric SAR system impulse response matrices. In particular, PD effects on linearly polarized and circularly polarized SAR systems are analyzed by system impulse response matrices. Theoretically, PD will introduce amplitude modulation to SAR spectrums and hence distort linearly polarized SAR imaging; for circularly polarized systems, it introduces relative image shift and phase errors between images of different channels. Numerical evaluations and simulations show that PD effects will introduce noticeable effects on future P-band wide-bandwidth SAR systems.
引用
收藏
页码：2163 / 2167
页数：5
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