联合SAR相位和振幅信息校正电离层延迟相位
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摘要
电离层延迟是合成孔径雷达差分干涉测量(DInSAR)的误差源之一,对长波段SAR数据影响尤为严重。文中提出联合SAR相位和振幅信息精确测量方位向偏移,并基于方位向偏移构建模型校正DInSAR电离层延迟相位。选取覆盖2008年汶川地震的ALOS PALSAR(轨道号471)同震干涉对为实验数据,进行电离层延迟校正实验和精度分析。结果表明,实验同震干涉对中电离层贡献相位达17rad,对应约32cm的视线向形变误差,经过校正后地震远场形变均方根减小59%。对比传统方法校正结果,所提方法可有效提高电离层延迟相位校正精度。
Ionosphere delay is one of the error sources in Differential Interferometric Synthetic Aperture Radar(DInSAR),especially for the SAR systems with long wavelength.This paper proposes a method by the integration of SAR phase and amplitude information for measuring the azimuth offset of a SAR pair.The determined azimuth offset is then used to correct the ionosphere phase delay based on a correction model.For inferring the efficiency and precision of the proposed method,this paper applies the method to one ALOS PALSAR(Path 471)coseismic interferometric pair that covers the Wenchuan 2008(China).The testing result shows that the maximum ionosphere phase delay in the coseismic SAR pair is about 17 rad,corresponding to the deformation error of about 32 cm in line of sight.The coseismic displacements in the far field have a reduction of its standard deviation with 59 %.The proposed method can improve the correction precision in the mitigation of ionosphere phase delay,compared with the conventional correction method.
Ionosphere delay is one of the error sources in Differential Interferometric Synthetic Aperture Radar(DInSAR),especially for the SAR systems with long wavelength.This paper proposes a method by the integration of SAR phase and amplitude information for measuring the azimuth offset of a SAR pair.The determined azimuth offset is then used to correct the ionosphere phase delay based on a correction model.For inferring the efficiency and precision of the proposed method,this paper applies the method to one ALOS PALSAR(Path 471)coseismic interferometric pair that covers the Wenchuan 2008(China).The testing result shows that the maximum ionosphere phase delay in the coseismic SAR pair is about 17 rad,corresponding to the deformation error of about 32 cm in line of sight.The coseismic displacements in the far field have a reduction of its standard deviation with 59 %.The proposed method can improve the correction precision in the mitigation of ionosphere phase delay,compared with the conventional correction method.
引文
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[12]MICHEL R,AVOUAC J P.Measuring near field coseismic displacements from SAR images Application to the Landers Earthquake[J].Geophysical Research Letters,1999.
[13]JUNG H S,WON J S,KIM S W.An Improvement of the Performance of Multiple-Aperture SAR Interferometry(MAI)[J].Ieee Transactions on Geoscience and Remote Sensing,2009,47(8):2859-2869.
[14]JUNG H S,LEE W J,ZHANG L.Theoretical Accuracy of Along-Track Displacement Measurements from Multiple-Aperture Interferometry(MAI)[J].Sensors(Basel),2014,14(9):17703-17724.
[15]FENG G,HETLAND E A,DING X,et al.Coseismic fault slip of the 2008Mw7.9Wenchuan earthquake estimated from InSAR and GPS measurements[J].Geophysical Research Letters,2010,37(1):L01302.
[16]单新建,屈春燕,宋小刚,等.汶川M S 8.0级地震InSAR同震形变场观测与研究[J].地球物理学报,2009,52(2):496-504.
[17]张国宏,屈春燕,汪驰升,等.基于GPS和InSAR反演汶川Mw 7.9地震断层滑动分布[J],大地测量与地球动力学,2010,30(4):19-24.
[18]许才军,林敦灵,温扬茂.利用InSAR数据的汶川地震形变场提取及分析[J].武汉大学学报(信息科学版),2010,35(10):1138-1142.
[19]杨莹辉,陈强,刘国祥,等.汶川地震同震形变场的GPS和InSAR邻轨平滑校正与断层滑移精化反演[J].地球物理学报,2014,1462-1476.
[2]DING X L,LI Z W,ZHU J J,et al.Atmospheric Effects on InSAR Measurements and Their Mitigation[J].Sensors(Basel),2008,8(9):5426-5448.
[3]MEYER F,BAMLER R,JAKOWSKI N,et al.The Potential of Low-Frequency SAR Systems for Mapping Ionospheric TEC Distributions[J].IEEE Geoscience and Remote Sensing Letters,2006,3(4):560-564.
[4]HASHIMOTO M,ENOMOTO M,FUKUSHIMA Y.Coseismic Deformation from the 2008 Wenchuan,China,Earthquake Derived from ALOS/PALSAR Images[J].Tectonophysics,2010,491(1):59-71.
[5]SANSOSTI E,BERARDINO P,BONANO M et al.How second generation SAR systems are impacting the analysis of ground deformation[J].International Journal of Applied Earth Observation and Geoinformation,2014,28:1-11.
[6]陈艳玲,黄城,王小亚,等.电离层对SAR干涉测量的影响综述[J].地球物理学进展,2010,25(3):823-830.
[7]ZHANG B,DING X,ZHU W,et al.Mitigating Ionospheric Artifacts in Coseismic Interferogram Based on Offset Field Derived From ALOS-PALSAR Data[J].IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing,2016:1-10.
[8]RAUCOULES D,DE M M.Assessing Ionospheric Influence on L-Band SAR Data:Implications on Coseismic Displacement Measurements of the 2008 Sichuan Earthquake[J].IEEE Geoscience and Remote Sensing Letters,2010,7(2):286-290.
[9]JUNG H S,LEE D T,LU Z,et al.Ionospheric Correction of SAR Interferograms by Multiple-Aperture Interferometry[J].IEEE Transactions on Geoscience and Remote Sensing,2013,51(5):3191-3199.
[10]LIU Z,JUNG H S,LU Z.Joint Correction of Ionosphere Noise and Orbital Error in L-Band SAR Interferometry of Interseismic Deformation in Southern California[J].IEEE Transactions on Geoscience and Remote Sensing,2014,52(6):3421-3427.
[11]BECHOR N B D,ZEBKER H A.Measuring two-dimensional movements using a single InSAR pair[J].Geophysical Research Letters,2006,33(16).
[12]MICHEL R,AVOUAC J P.Measuring near field coseismic displacements from SAR images Application to the Landers Earthquake[J].Geophysical Research Letters,1999.
[13]JUNG H S,WON J S,KIM S W.An Improvement of the Performance of Multiple-Aperture SAR Interferometry(MAI)[J].Ieee Transactions on Geoscience and Remote Sensing,2009,47(8):2859-2869.
[14]JUNG H S,LEE W J,ZHANG L.Theoretical Accuracy of Along-Track Displacement Measurements from Multiple-Aperture Interferometry(MAI)[J].Sensors(Basel),2014,14(9):17703-17724.
[15]FENG G,HETLAND E A,DING X,et al.Coseismic fault slip of the 2008Mw7.9Wenchuan earthquake estimated from InSAR and GPS measurements[J].Geophysical Research Letters,2010,37(1):L01302.
[16]单新建,屈春燕,宋小刚,等.汶川M S 8.0级地震InSAR同震形变场观测与研究[J].地球物理学报,2009,52(2):496-504.
[17]张国宏,屈春燕,汪驰升,等.基于GPS和InSAR反演汶川Mw 7.9地震断层滑动分布[J],大地测量与地球动力学,2010,30(4):19-24.
[18]许才军,林敦灵,温扬茂.利用InSAR数据的汶川地震形变场提取及分析[J].武汉大学学报(信息科学版),2010,35(10):1138-1142.
[19]杨莹辉,陈强,刘国祥,等.汶川地震同震形变场的GPS和InSAR邻轨平滑校正与断层滑移精化反演[J].地球物理学报,2014,1462-1476.