NDLI: Potential Effects of the Ionosphere on Space-Based SAR Imaging

Content Provider	IEEE Xplore Digital Library
Author	Zheng-Wen Xu Jian Wu Zhen-Sen Wu
Copyright Year	1963
Abstract	There has been a considerable interest in the use of lower frequency (VHF/UHF) space-based synthetic aperture radar (SAR) for realizing the foliage and ground penetration. The phase perturbation, signal distortion and imaging resolution degradation by the ionosphere will be particularly severe, however the model is not yet well established and still needs to be further studied. In this paper, on the basis of possible improvements for the model proposed by Ishimaru and others, potential ionospheric effects on SAR imaging are evaluated. First, for analyzing azimuthal resolution, we apply the fourth moment recently obtained in general case of strong fluctuation regimes, which is expected to give results for wider conditions. The Gaussian approximation was used in the previous model; however it is only valid in the fully saturated regimes. Second, for analyzing image shift and distortion, besides group delay, the higher-order dispersion is considered. Third, for discussing range resolution degraded due to pulse broadening, besides the dispersion, the multiple scattering of ionospheric turbulence is studied. Fourth, the Faraday rotation effect is analyzed. Numerical simulations are shown using ionospheric turbulence spectrum and TEC inferred from the International Reference Ionosphere (IRI) and satellite beacon observations.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	1968
Ending Page	1975
Page Count	8
File Size	1244625
File Format	PDF
ISSN	0018926X
Volume Number	56
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ionosphere Radar polarimetry Degradation Frequency Synthetic aperture radar Phase distortion Image resolution Signal resolution Fluctuations Gaussian approximation synthetic aperture radar (SAR) Electromagnetic propagation in random media ionospheric electromagnetic propagation
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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