| 机载SAR影像主动定位的数学模型研究 |
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| 引用本文： | 岳昔娟,黄国满,赵争.机载SAR影像主动定位的数学模型研究[J].测绘科学,2009,34(2). |
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| 作者姓名： | 岳昔娟 黄国满 赵争 |
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| 作者单位： | 1. 中国测绘科学研究院,北京,100039;武汉大学测绘学院,武汉,430079
2. 中国测绘科学研究院,北京,100039 |
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| 基金项目： | 基本科研业务费资助项目，对地观测技术国家测绘局重点实验室资助项目 |
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| 摘 要： | 本文基于差分GPS(Differential Global Positioning System,DGPS)和惯性导航系统(Inertial Navigation System,INS)数据,在无控制点的情况下,导出了一种进行机载SAR影像主动定位的数学模型。此模型包括DGPS/INS数据进行坐标系转换、天线动态偏心改正、雷达天线相位中心插值和距离-多普勒(Range-Doppler,R-D)模型及解算。根据距离-多普勒(Range-Doppler,R-D)模型和数字高程模型(Digital Elevation Model,DEM)数据,获得机载SAR影像上每点所对应的地理坐标,重采样生成正射影像图。本文通过成都测区1m分辨率的机载SAR影像主动定位试验,验证了此数学模型的正确性,分析了主要系统误差源及系统误差的改正方法。
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| 关 键 词： | 机载SAR影像 主动定位 距离多普勒定位模型 天线动态偏心改正 天线相位中心插值 |
Research on the mathematic model of direct geolocation with airborne SAR image |
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| YUE Xi-juan,HUANG Guo-man,ZHAO Zheng.Research on the mathematic model of direct geolocation with airborne SAR image[J].Science of Surveying and Mapping,2009,34(2). |
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| Authors: | YUE Xi-juan HUANG Guo-man ZHAO Zheng |
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| Abstract: | This paper obtains a mathematic model of direct geolocation of Airborne SAR image in uncontrolled circumstances with DGPS(Differential Global Positioning System) and Inertial Navigation System(INS) data. The model includes coordinate transformation, dynamic eccentric correction, interpolation of antenna phase center and Range-Doppler(R-D) Model. According to R-D Model and Digital Elevation Model(DEM) data, geographic coordinates of points are calculated in Airborne SAR image, then ortho-image is obtained by resample. According to the experiment with one-meter resolution airborne SAR images in Chengdu study site, the mathematic model is feasible, and the sources and correcting methods of main systematic errors are analyzed. |
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| Keywords: | airborne SAR image direct geolocation Range-Doppler model dynamic eccentric correction of antenna interpolation of antenna phase center |
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