Analysis of the Regional Ionosphere at Low Latitudes in Support of the Biomass ESA Mission
Analysis of the Regional Ionosphere at Low Latitudes in Support of the Biomass ESA Mission
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低纬度区域电离层分析以支持欧空局生物质任务
DOI：
10.1109/tgrs.2018.2838321
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发表时间：
2018
影响因子：
8.2
通讯作者：
Alfonsi L
中科院分区：
文献类型：
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作者：
Alfonsi L
Biomass 是一种位于黎明-黄昏近地轨道的星载偏振 P 波段 (435 MHz) 合成孔径雷达 (SAR)。其主要目标是测量地球上所有森林的生物量含量和变化。电离层在低频 SAR 发射的每个脉冲上引入法拉第旋转，并在脉冲穿过等离子体不规则区域时产生闪烁，从而影响成像质量。其中一些影响是由于总电子含量 (TEC) 及其沿传播路径的梯度造成的。因此，有必要对电离层形态和动力学进行准确评估，以正确了解电离层对图像质量的影响，特别是在赤道和热带地区。为此，我们对巴西和东南亚赤道电离层异常（EIA）的两个波峰引入的显着噪声预算进行了深入调查。本文的特点是采用一种新颖的方法来构想面向 SAR 的电离层评估，旨在通过全球导航卫星系统地面监测站检测和识别空间和时间 TEC 梯度，包括闪烁效应和移动电离层扰动。这种方法的新颖之处在于定制有关电离层对 SAR 成像影响的信息，这些信息是由生物质航天器经过期间运行的地面仪器的本地密集网络得出的。结果表明，EIA 波峰是存在大量不规则现象的区域，可能会导致 SAR 成像质量下降。还强调了有关低纬度电离层局部特征的有趣见解。
Biomass is a spaceborn polarimetric P-band (435 MHz) synthetic aperture radar (SAR) in a dawn-dusk low Earth orbit. Its principal objective is to measure biomass content and change in all the Earth's forests. The ionosphere introduces the Faraday rotation on every pulse emitted by low-frequency SAR and scintillations when the pulse traverses a region of plasma irregularities, consequently impacting the quality of the imaging. Some of these effects are due to total electron content (TEC) and its gradients along the propagation path. Therefore, an accurate assessment of the ionospheric morphology and dynamics is necessary to properly understand the impact on image quality, especially in the equatorial and tropical regions. To this scope, we have conducted an in-depth investigation of the significant noise budget introduced by the two crests of the equatorial ionospheric anomaly (EIA) over Brazil and Southeast Asia. This paper is characterized by a novel approach to conceive a SAR-oriented ionospheric assessment, aimed at detecting and identifying spatial and temporal TEC gradients, including scintillation effects and traveling ionospheric disturbances, by means of Global Navigation Satellite Systems ground-based monitoring stations. The novelty of this approach resides in the customization of the information about the impact of the ionosphere on SAR imaging as derived by local dense networks of ground instruments operating during the passes of Biomass spacecraft. The results identify the EIA crests as the regions hosting the bulk of irregularities potentially causing degradation on SAR imaging. Interesting insights about the local characteristics of low-latitudes ionosphere are also highlighted.
ERICA 研究中东南亚的电离层监测
影响因子：
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作者：
G. Povero;L. Alfonsi;L. Spogli;D. Mauro;C. Cesaroni;F. Dovis;R. Romero;P. Abadi;M. Huy;N. Floury
通讯作者：
N. Floury
影响因子：
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作者：
R. Woodman
通讯作者：
R. Woodman
EIA波峰附近电离层闪烁与赤道电动力学的研究
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
S. Chatterjee;S. Chakraborty;B. Veenadhari;S. Banola
通讯作者：
S. Banola