太赫兹科学与电子信息学报, 2017, 15 (2): 198, 网络出版: 2017-06-06   

基于频带分割法反演电离层 TEC参数

Retrieving ionospheric TEC based on the split-spectrum method
作者单位
复旦大学电磁波信息科学教育部重点实验室,上海 200433
摘要
星载合成孔径雷达( SAR)系统会受到电离层带来的相位影响,降低星载 SAR系统成像质量,对低频段宽带星载 SAR尤其明显。为了消除电离层对星载 SAR带来的相位影响,基于陆地观测技术卫星 2号(ALOS-2)星载 SAR数据,采用距离向频带分割法来估计电离层电子总含量( TEC)参数。验证推导距离向频带分割法的最优估计精确度,并利用 ALOS-2数据,采用距离向频带分割法反演得到二维电离层 TEC参数分布,分析了距离向分辨单元数对反演精确度的影响。另外,分析了雷达图像不同区域采用距离向频带分割法的估计精确度。结果表明频带分割法具有很强的鲁棒性,可以有效地反演电离层 TEC参数分布,同时距离向分辨力单元数和成像区域场景地形起伏也影响反演电离层参数的精确度。
Abstract
The ionosphere can affect the phase of spaceborne Synthetic Aperture Radar(SAR) signal, which will degrade the quality of SAR imaging, especially for the low frequency wideband spaceborne SAR. Based on Advanced Land Observing Satellite-2(ALOS-2) SAR data, the ionospheric Total Electron Content(TEC) distribution is estimated by using the split-spectrum method in order to eliminate the impact of ionosphere. Firstly, the accuracy of the split-spectrum method for retrieving ionospheric TEC is validated. Then, the two-dimensional ionospheric TEC distribution is obtained based on the split-spectrum method using ALOS-2 data. The range resolution cell effect is also analyzed. The ionopheric TEC estimation accuracies of the split-spectrum method for three different typical areas in SAR image are compared. The results show that the split-spectrum method is robust to estimate the two-dimensional ionopheric TEC effectively. The range resolution cell and different scenes in SAR image also affect the TEC estimation accuracy of the split-spectrum method.
参考文献

[1] XU Z W,WU J,WU Z S. A survey of ionospheric effects on space-based radar[J]. Waves in Random Media, 2004,14(2):189-273.

[2] MEYER F J. Performance requirements for ionospheric correction of low-frequency SAR data[J]. IEEE Transactions on Geoscience & Remote Sensing, 2011,49(10):3694-3702.

[3] FREEMAN A,SAATCHI S S. On the detection of Faraday rotation in linearly polarized L-band SAR backscatter signatures[J]. IEEE Transactions on Geoscience & Remote Sensing, 2004,42(8):1607-1616.

[4] FREEMAN A. Calibration of linearly polarized polarimetric SAR data subject to Faraday rotation[J]. IEEE Transactions on Geoscience & Remote Sensing, 2004,42(8):1617-1624.

[5] JEHLE M,FREY O,SMALL D,et al. Measurement of ionospheric TEC in spaceborne SAR data [J]. IEEE Transactions on Geoscience & Remote Sensing, 2010,48(6):2460-2468.

[6] 王成,张民,许正文,等.基于星载 SAR信号的 TEC反演新方法[J].地球物理学报, 2014,57(11):3570-3576. (WANG Cheng,ZHANG Min,XU Zhengwen,et al. A new approach of TEC retrieval from the space-borne SAR[J]. Chinese Journal of Geophysics, 2014,57(11):3570-3576.)

[7] BAMLER R,EUNEDER M. Accuracy of differential shift estimation by correlation and split-bandwidth interferometry for wideband and delta-k SAR systems[J]. IEEE Geoscience & Remote Sensing Letters, 2005,2(2):151-155.

[8] BRCIC R,PARIZZI A,EINEDER M,et al. Estimation and compensation of ionospheric delay for SAR Interferometry[C]// 2010 IEEE International Geoscience and Remote Sensing Symposium(IGARSS). [S.l]:IEEE, 2010:2908–2911.

[9] ROSEN P,HENSLEY S,CHEN C. Measurement and mitigation of the ionosphere in L-band interferometric SAR data[C]// Proc. IEEE Radar Conf., 2010:1459-1463.

[10] GOMBA G,PARIZZI A,DE Zan F,et al. Toward operational compensation of ionospheric effects in SAR interferograms: the split-spectrum method[J]. 2015 IEEE Transactions on Geoscience and Remote Sensing, 2015,54(3):1446-1461.

[11] MEYER F,BAMLER R,JAKOWSKI N,et al. The potential of low-frequency SAR systems for mapping ionospheric TEC distributions[J]. IEEE Geoscience & Remote Sensing Letters, 2006,3(4):560-564.

[12] ULANDER L M H,ASKNE J. Repeat-pass SAR interferometry over forested terrain[J]. IEEE Transactions on Geoscience & Remote Sensing, 1995,33(2):331-340.

王楠, 付海洋, 李索, 徐丰. 基于频带分割法反演电离层 TEC参数[J]. 太赫兹科学与电子信息学报, 2017, 15(2): 198. WANG Nan, FU Haiyang, LI Suo, XU Feng. Retrieving ionospheric TEC based on the split-spectrum method[J]. Journal of terahertz science and electronic information technology, 2017, 15(2): 198.

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