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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Toward Operational Compensation of Ionospheric Effects in SAR Interferograms: The Split-Spectrum Method
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Toward Operational Compensation of Ionospheric Effects in SAR Interferograms: The Split-Spectrum Method

机译：SAR干涉图中电离层效应的运行补偿：分谱法

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摘要

The differential ionospheric path delay is a major error source in L-band interferograms. It is superimposed to topography and ground deformation signals, hindering the measurement of geophysical processes. In this paper, we proceed toward the realization of an operational processor to compensate the ionospheric effects in interferograms. The processor should be robust and accurate to meet the scientific requirements for the measurement of geophysical processes, and it should be applicable on a global scale. An implementation of the split-spectrum method, which will be one element of the processor, is presented in detail, and its performance is analyzed. The method is based on the dispersive nature of the ionosphere and separates the ionospheric component of the interferometric phase from the nondispersive component related to topography, ground motion, and tropospheric path delay. We tested the method using various Advanced Land Observing Satellite Phased-Array type L-band synthetic aperture radar interferometric pairs with different characteristics: high to low coherence, moving and nonmoving terrains, with and without topography, and different ionosphere states. Ionospheric errors of almost 1 m have been corrected to a centimeter or a millimeter level. The results show how the method is able to systematically compensate the ionospheric phase in interferograms, with the expected accuracy, and can therefore be a valid element of the operational processor.
机译：电离层路径延迟差是L波段干涉图中的主要误差源。它被叠加到地形和地面变形信号上，从而阻碍了地球物理过程的测量。在本文中，我们朝着实现可补偿干涉图中电离层效应的运算处理器的方向迈进。该处理器应坚固，准确，以满足对地球物理过程测量的科学要求，并且应在全球范围内适用。详细介绍了分谱方法的实现，它将成为处理器的一个组成部分，并对其性能进行了分析。该方法基于电离层的色散特性，将干涉相的电离层分量与与地形，地面运动和对流层路径延迟相关的非色散分量分开。我们使用各种具有不同特征的高级陆地观测卫星相控阵型L波段合成孔径雷达干涉测量对方法进行了测试，这些特征对具有高至低的相干性，移动和不移动的地形，有无地形以及电离层状态不同。已将近1 m的电离层误差校正到厘米或毫米水平。结果表明，该方法如何能够以预期的精度系统地补偿干涉图中的电离层相位，因此可以作为运算处理器的有效元素。

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