Journal ArticleDOI
A survey of ionospheric effects on space-based radar
Zheng-Wen Xu,Jian Wu,Zhensen Wu +2 more
TLDR
In this paper, a survey of the potential ionospheric effects on the performance of space-based radar systems (SBRs) operating in the ambient ionosphere environment is presented.Abstract:
In this survey, we fully review almost all potential ionospheric effects on the performance of space-based radar systems (SBRs), which operate in the ambient ionosphere environment; in particular, we review the use of space-based synthetic aperture radar systems (SARs) for imaging. There are two families of effects involved. One is the effects of the background ionosphere (non-turbulent ionosphere), such as dispersion, group delay, refraction, Faraday rotation, and phase shift. The other is the effects due to ionospheric irregularities, such as refractive index fluctuation, phase perturbation, angle-of-arrival fluctuation, pulse broadening, clutter, and amplitude scintillation. These effects adversely affect SAR imaging in several respects, such as by causing image shift in the range, and degradations of the range resolution, azimuthal resolution, and/or the resolution in height (elevation). We also review ionospheric irregularity characteristics and descriptions, propagation channel statistics, ...read more
Citations
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Journal ArticleDOI
On Signal Modeling of Moon-Based Synthetic Aperture Radar (SAR) Imaging of Earth
Zhen Xu,Kun-Shan Chen +1 more
TL;DR: A Moon-Based SAR theory in which a signal model is derived and its two-dimensional (2-D) spectrum is derived is developed, and numerical simulation using point targets validates the signal model and enables Doppler parameter estimation for image focusing.
Journal ArticleDOI
SHARAD Signal Attenuation and Delay Offsets Due to the Martian Ionosphere
TL;DR: This work estimates and correct variable time-delay offsets among Mars Shallow Radar sounding observations of the north polar layered deposits of Mars under a broad range of ionospheric conditions and characterize the attenuation of SHARAD echoes as a function of TEC to facilitate detection of seasonal changes in surface physical properties.
Journal ArticleDOI
Signal distortion on VHF/UHF transionospheric paths : First results from the Wideband Ionospheric Distortion Experiment
TL;DR: In this article, the authors report the first determination of ionospheric distortion, comprising the simultaneous characterization of both multipath and Doppler, on wideband, transionospheric VHF (158 MHz) and UHF (422 MHz) signals.
Journal ArticleDOI
An ionospheric index suitable for estimating the degree of ionospheric perturbations
TL;DR: In this article, the authors proposed a robust ionospheric disturbance index that is able to accurately characterize temporal and spatial ionosphere variations of small to medium scales, which is suitable as potential driver for an ionosphere space weather scale.
Proceedings ArticleDOI
The Impact of the Ionosphere on Interferometric SAR Processing
Franz J. Meyer,Jeremy B. Nicoll +1 more
TL;DR: The theoretical background for ionospheric effects on InSAR is provided and expected magnitudes of the respective effects for various existing SAR sensors are quantified and methods for their detection and correction are discussed.
References
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TL;DR: In this paper, the authors present a review of the techniques of interferometry, systems and limitations, and applications in a rapidly growing area of science and engineering, including cartography, geodesy, land cover characterization, and natural hazards.
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