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The Potential of Low-Frequency SAR Systems for Mapping Ionospheric TEC Distributions

机译:低频SAR系统用于绘制电离层TEC分布的潜力

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摘要

Ionospheric propagation effects have a significant impact on the signal properties of low-frequency synthetic aperture radar (SAR) systems. Range delay, interferometric phase bias, range defocusing, and Faraday rotation are the most prominent ones. All the effects are a function of the so-called total electron content (TEC). Methods based on two-frequency global positioning system observations allow measuring TEC in the ionosphere with coarse spatial resolution only. In this letter, the potential of broadband L-band SAR systems for ionospheric TEC mapping is studied. As a basis, the dispersive nature of the ionosphere and its effects on broadband microwave radiation are theoretically derived and analyzed. It is shown that phase advance and group delay can be measured by interferometric and correlation techniques, respectively. The achievable accuracy suffices in mapping small-scale ionospheric TEC disturbances. A differential TEC estimator that separates ionospheric from tropospheric contributions is proposed
机译:电离层传播效应对低频合成孔径雷达(SAR)系统的信号特性有重大影响。范围延迟,干涉式相位偏置,范围散焦和法拉第旋转是最突出的。所有影响都是所谓的总电子含量(TEC)的函数。基于双频全球定位系统观测的方法仅允许在电离层中以较粗的空间分辨率测量TEC。在这封信中,研究了宽带L波段SAR系统用于电离层TEC映射的潜力。作为基础,从理论上推导和分析了电离层的色散特性及其对宽带微波辐射的影响。结果表明,相位超前和群时延可以分别通过干涉技术和相关技术进行测量。在绘制小规模电离层TEC干扰时,可以达到的精度就足够了。提出了一种区分电离层和对流层贡献的差分TEC估计器

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