基于改进的切比雪夫多项式轨道的SAR影像正射纠正
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摘要
在利用SAR(合成孔径雷达)严格几何模型(距离-多普勒)进行影像正射纠正时,为消除卫星轨道误差对影像正射纠正精度的影响,提出了一种新的卫星轨道模型——切比雪夫多项式。首先利用切比雪夫多项式对SAR影像元数据中提供的若干卫星轨道状态矢量进行拟合,以获得影像成像期间内卫星轨道状态矢量关于时间的函数关系式;然后利用少量地面控制点修正切比雪夫多项式拟合的参数;最后将修正之后的卫星轨道模型用于SAR严格几何模型的正射纠正,从而提高正射纠正影像的定位精度。结合SAR的几何成像参数、数字高程模型,选择广西桂林某地区的Radarsat-2卫星拍摄的SAR影像进行试验,利用所提出的方法与传统正射纠正方法进行对比,试验结果得出正射纠正精度在40m以内,定位精度优于传统方法。
In order to eliminate the influence of satellite orbit error on the accuracy of image orthorectification when using SAR rigorous geometric model(range-Doppler), a new satellite orbit model based on improved Chebyshev polynomials was proposed. Firstly, several satellite orbit state vectors provided in SAR image metadata were fitted by Chebyshev polynomials, and the function relation of the state vectors were obtained with respect to time during the imaging period. Then, the fitting parameters of the Chebyshev polynomials were modified with sparse ground control points. Finally, the modified satellite orbit model was used in the orthorectification based on the SAR rigorous geometric model, thereby improving the positioning accuracy of the orthorectified image. Combined with SAR geometric imaging parameters and digital elevation model, the SAR images taken by the Radarsat-2 satellite in a certain area of Guilin, Guangxi, were selected for experiment. The proposed method was compared with the traditional orthorectification method. The test results show that the orthorectification accuracy is smaller than 40 meters, and the positioning accuracy is better than the traditional method.
In order to eliminate the influence of satellite orbit error on the accuracy of image orthorectification when using SAR rigorous geometric model(range-Doppler), a new satellite orbit model based on improved Chebyshev polynomials was proposed. Firstly, several satellite orbit state vectors provided in SAR image metadata were fitted by Chebyshev polynomials, and the function relation of the state vectors were obtained with respect to time during the imaging period. Then, the fitting parameters of the Chebyshev polynomials were modified with sparse ground control points. Finally, the modified satellite orbit model was used in the orthorectification based on the SAR rigorous geometric model, thereby improving the positioning accuracy of the orthorectified image. Combined with SAR geometric imaging parameters and digital elevation model, the SAR images taken by the Radarsat-2 satellite in a certain area of Guilin, Guangxi, were selected for experiment. The proposed method was compared with the traditional orthorectification method. The test results show that the orthorectification accuracy is smaller than 40 meters, and the positioning accuracy is better than the traditional method.
引文
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[18]王义峰,文鸿雁,刘立龙.用切比雪夫多项式标准化GPS卫星轨道[J].测绘与空间地理信息,2008,31(1):21-22.WANG Yifeng,WEN Hongyan,LIU Lilong.Standardizing GPS Satellite Orbits with Chebyshev Polynomials[J].Geomatics&Spatialinformation Technology,2008,31(1):21-22.(in Chinese)
[19]姚玉林,张妍,陈琦.基于时间误差补偿的HJ-1C卫星几何定位改进[J].航天返回与遥感,2014,35(2):77-78.YAO Yulin,ZHANG Yan,CHEN Qi.Location Improvement of HJ-1C Satellite Based on Time Error Compensation[J].Spacecraft Recovery&Remote Sensing,2014,35(2):77-78.(in Chinese)
[20]姚玉林,陆书宁.基于距离梯度的多普勒中心估计精度分析[J].航天返回与遥感,2011,32(3):57-61.YAO Yulin,LU Shuning.Accuracy Analysis of Doppler Centroid Estimation Based on Range Gradient[J].Spacecraft Recovery&Remote Sensing,2011,32(3):57-61.(in Chinese)
[21]ZHOU G,LI R.Accuracy Evaluation of Ground Points from IKONOS High-resolution Satellite Imagery[J].Photogrammetric Engineering and Remote Sensing,2000,66(9):1103-1105.
[2]王冬红,刘军,张莉.基于F.Leberl改进模型的星载SAR影像精纠正[J].测绘通报,2005(10):12-13.WANG Donghong,LIU Jun,ZHANG Li.Precise Rectification of Spaceborne SAR Images Based on Improved F.Leberl Model[J].Bulletin of Surveying and Mapping,2005(10):12-13.(in Chinese)
[3]ZHOU G,CHEN W,KELMELIS J A,et al.A Comprehensive Study on Urban True Orthorectification[J].IEEETransactions on Geoscience&Remote Sensing,2005,43(9):2138-2147.
[4]ZHOU G,YUE T,SHI Y,et al.Second-order Polynomial Equation-based Block Adjustment for Orthorectification of DISPImagery[J].Remote Sensing,2016,8(8):680.
[5]王春媛.遥感图像几何校正及目标识别技术研究[D].哈尔滨:哈尔滨工业大学,2014.WANG Chunyuan.Research on Geometric Correction and Object Recognition for Remote Sensing Image[D].Harbin:Harbin Institute of Technology,2014.(in Chinese)
[6]ZHOU G.Near Real-time Orthorectification and Mosaic of Small UAV Video Flow for Time-critical Event Response[J].IEEE Transactions on Geoscience and Remote Sensing,2009,47(3):739-742.
[7]CURLANDER J C.Utilization of Spaceborne SAR Data for Mapping[J].IEEE Transactions on Geoscience&Remote Sensing,1984(2):106-109.
[8]BROWN W E.Applications of SEASAT SAR Digitally Correlated Imagery for Sea Ice Dynamics[C]//AMER Geo phys.Union Spring Meeting.Baltimore,1981:25-29.
[9]张永红.合成孔径雷达成像几何机理分析与处理方法研究[D].武汉:武汉大学,2001.ZHNAG Yonghong.Synthetic Aperture Radar Imaging Geometry Understanding and Processing[D].Wuhan:Wuhan University,2001.(in Chinese)
[10]陈尔学.星载合成孔径雷达影像正射校正方法研究[D].北京:中国林业科学研究院,2004.CHEN Erxue.Topic of the Dissertation Study on Ortho-rectification Methodology of Space-borne Synthetic Aperture Radar Imagery[D].Beijing:Chinese Academy of Forestry,2004.(in Chinese)
[11]魏钜杰.复杂地形区域合成孔径雷达正射影像制作方法研究[D].阜新:辽宁工程技术大学,2009.WEI Jujie.SAR Ortho Image Generation in Sophisticated Area[D].Fuxin:Liaoning Technical University,2009.(in Chinese)
[12]敖祖锐.星载SAR影像模拟及其在正射校正中的应用研究[D].北京:首都师范大学,2014.AO Zurui.Spaceborne SAR Image Simulation and Its Application in Orthorectification[D].Beijing:Capital Normal University,2014.(in Chinese)
[13]刘佳音,尤红建,洪文.用于星载SAR图像几何校正的稀疏控制点修轨方法[J].武汉大学学报(信息科学版),2013,38(3):262-265.LIU Jiayin,YOU Hongjian,HONG Wen.Modified Orbit Algorithm with Sparse Ground Control Points for Geo-Rectification of Sapace-born SAR Image[J].Geomatics and Information Science of Wuhan University,2013,38(3):262-265.(in Chinese)
[14]陈继伟,曾琪明,焦健,等.利用轨道参数修正的无控制点星载SAR图像几何校正方法[J].测绘学报,2016,45(12):1434-1436.CHEN Jiwei,ZENG Qiming,JIAO Jian,et al.Spaceborne SAR Image Geometric Rectification Method without Ground Control Points Using Orbit Parameters Modulation[J].Acta Geodaetica et Cartographica Sinica,2016,45(12):1434-1436.(in Chinese)
[15]余鹏,孙学金,赵世军.GPS定位中卫星坐标计算的切比雪夫多项式拟合法[J].气象科技,2004,32(3):198-200.YU Peng,SUN Xuejin,ZHAO Shijun.Chebyshev Polynomial Fitting Model for GPS Orbit Calculation[J].Meteorological Science and Technology,2004,32(3):198-200.(in Chinese)
[16]杨学锋,程鹏飞,方爱平,等.利用切比雪夫多项式拟合卫星轨道坐标的研究[J].测绘通报,2008(12):1-2.YANG Xuefeng,CHEN Pengfei,FANG Aiping,et al.On Fitting Satellite Orbit Coordinate Using Chebyshev Polynomial[J].Bulletin of Surveying and Mapping,2008(12):1-2.(in Chinese)
[17]王兴,高井祥,王坚,等.利用滑动式切比雪夫多项式拟合卫星精密坐标和钟差[J].测绘通报,2015(5):6-7.WANG Xing,GAO Jingxiang,WANG Jian,et al.Using Sleek Chebyshev Polynomial to Fit the Precise Satellite Coordinate and Clock Error[J].Bulletin of Surveying and Mapping,2015(5):6-7.(in Chinese)
[18]王义峰,文鸿雁,刘立龙.用切比雪夫多项式标准化GPS卫星轨道[J].测绘与空间地理信息,2008,31(1):21-22.WANG Yifeng,WEN Hongyan,LIU Lilong.Standardizing GPS Satellite Orbits with Chebyshev Polynomials[J].Geomatics&Spatialinformation Technology,2008,31(1):21-22.(in Chinese)
[19]姚玉林,张妍,陈琦.基于时间误差补偿的HJ-1C卫星几何定位改进[J].航天返回与遥感,2014,35(2):77-78.YAO Yulin,ZHANG Yan,CHEN Qi.Location Improvement of HJ-1C Satellite Based on Time Error Compensation[J].Spacecraft Recovery&Remote Sensing,2014,35(2):77-78.(in Chinese)
[20]姚玉林,陆书宁.基于距离梯度的多普勒中心估计精度分析[J].航天返回与遥感,2011,32(3):57-61.YAO Yulin,LU Shuning.Accuracy Analysis of Doppler Centroid Estimation Based on Range Gradient[J].Spacecraft Recovery&Remote Sensing,2011,32(3):57-61.(in Chinese)
[21]ZHOU G,LI R.Accuracy Evaluation of Ground Points from IKONOS High-resolution Satellite Imagery[J].Photogrammetric Engineering and Remote Sensing,2000,66(9):1103-1105.