摘要
星载SAR无控制点定位可利用距离-多普勒(R-D)模型和有理多项式(RPC)模型两种方法实现。为考察二者在不同高程条件下的适用性,本文利用Radarsat-2数据,基于绝对定位误差小于1m的GPS控制点,对R-D模型和RPC模型定位精度进行了对比分析。结果表明:在无高程数据仅利用头文件元数据的情况下,R-D模型和RPC模型定位精度都较差;当代入高程数据后,R-D模型表现出因高程变化引起的更好定位精度一致性。
The space-borne SAR location without reference points can be realized by two models,i.e.,the Range-Doppler（R-D） model and the rational polynomial coefficients（RPC） model.To evaluate the applicability of both models under different elevations,the R-D model and the RPC model are analyzed and compared based on the Radarsat-2 data in this paper,by utilizing the GPS controlling points with the accuracy of 1 meter.Experimental results indicate that both models can not work efficiently without any elevation information,provided that only the meta-data are used in the header file.However,if the elevation data are utilized,the R-D model presents better consistency of location precision when elevation varies.
出处
《遥感信息》
CSCD
2012年第5期14-18,25,共6页
Remote Sensing Information
基金
国家自然科学基金资助项目(40871191)
中国科学院对地观测与数字地球科学中心主任科学基金资助项目(09ZZ101101B)
江苏省资源环境信息工程重点实验室(中国矿业大学)开放基金资助项目(JS201108)
关键词
星载合成孔径雷达
距离-多普勒模型
有理多项式模型
定位精度
space-borne SAR imagery
Range-Doppler model
rational polynomial coefficients model
location accuracy
