Mitigation of ionospheric phase delay error for SAR interferometry: an application of FR-based and azimuth offset methods
Mitigation of ionospheric phase delay error for SAR interferometry: an application of FR-based and azimuth offset methods
复制标题
SAR 干涉测量电离层相位延迟误差的缓解：基于 FR 和方位偏移方法的应用
DOI：
10.1080/2150704x.2016.1235808
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发表时间：
2017-01
影响因子：
2.3
通讯作者：
Zhang Qin
中科院分区：
文献类型：
--
作者：
Zhu Wu;Ding Xiao-Li;Jung Hyung-Sup;Zhang Qin
合成孔径雷达（SAR）信号在大气中传播时会与电离层发生相互作用，导致SAR干涉测量（干涉合成孔径雷达）的相位延迟误差。虽然已经提出了几种方法来减轻电离层相位延迟，这些方法的应用还没有得到充分的研究。在这项研究中，两个电离层减轻方法，方位角偏移和法拉第旋转（FR）的应用进行了研究和分析，通过处理两个相控阵型L波段合成孔径雷达机载高级陆地观测卫星-1全极化SAR图像在阿拉斯加。结果表明，这两种方法都能有效地减小电离层相位延迟误差，其中基于FR的方法电离层校正结果的标准偏差由校正前的7.3 cm减小到3.2 cm，方位偏移法电离层校正结果的标准偏差由校正前的2.0 cm减小到2.0 cm。然而，也发现基于FR的方法容易被噪声污染，这可能是实际应用中的限制。此外，从方位偏移方法的剩余电离层相位的分析表明，在方位偏移和干涉相位图像中的剩余相位贡献是一个限制时，使用方位偏移来减轻电离层对SAR干涉测量的影响。该研究为在干涉合成孔径雷达中使用这两种方法抑制电离层相位延迟误差提供了参考。
ABSTRACT Synthetic aperture radar (SAR) signals interact with the ionosphere layer when they propagate through the atmosphere, leading to the phase delay error for SAR interferometry (InSAR). Although several methods have been proposed to mitigate the ionospheric phase delay, the application of these methods has not been fully investigated. In this study, an application of two ionospheric mitigating methods, azimuth offset and Faraday Rotation (FR), is investigated and analysed through processing two Phased Array type L-band Synthetic Aperture Radar onboard the Advanced Land Observing Satellite-1 full-polarimetric SAR images over Alaska. The result indicates that both methods can effectively mitigate the ionospheric phase delay error for SAR interferometry, where the standard deviations of the ionosphere-corrected result have decreased to 3.2 cm for FR-based method and 2.0 cm for azimuth offset method compared to those before correction (7.3 cm). However, it is also found that the FR-based method is easily contaminated by the noise, which may be a limitation in practical applications. Moreover, analysis of the residual ionospheric phase from azimuth offset method suggests that the residual phase contribution in the azimuth offset and interferometric phase images is a limitation when using the azimuth offset to mitigate the ionospheric effect on SAR interferometry. This study may provide useful information when using these two methods to mitigate the ionospheric phase delay error on InSAR.
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