“天绘一号”卫星三线阵CCD影像自检校区域网平差  

Self-calibration block adjustment for Mapping Satellite-1 three linear CCD image

作　　者：张艳[1] 王涛[1] 冯伍法 元朝鹏 王淑香 

机构地区：[1]信息工程大学地理空间信息学院,河南郑州450052 [2]中国天绘卫星中心,北京102102

出　　处：《遥感学报》2015年第2期219-227,共9页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家自然科学基金(编号:41101396;41001262);国家高技术研究发展计划(863计划)(编号:2012AA12A302-5);地理信息工程国家重点实验室开放基金资助项目(编号:SKLGIE2013-M-3-4)

摘　　要：遥感卫星在空间环境运转过程中,星敏感器的姿态角、成像相机的镜头和CCD等几何参数会发生不可预估的变化,从而对卫星影像的定位精度产生影响。因此,对卫星影像进行自检校区域网平差处理是实现卫星影像精确定位的一项关键技术。本文以"天绘一号"卫星为研究对象,首先分析了"天绘一号"卫星三线阵立体测绘相机的镜头和CCD几何形变,并提出了适用于"天绘一号"卫星三线阵CCD影像的自检校模型;然后建立"天绘一号"卫星三线阵CCD影像的自检校区域网平差模型,对外方位元素和自检校参数进行整体平差,消除存在于外方位元素观测值和自检校标定值中的系统误差,以提高卫星图像定位精度。最后利用嵩山实验场对"天绘一号"卫星三线阵CCD影像进行了自检校区域网平差处理,验证了自检校模型和自检校区域网平差模型的正确性和有效性,并分析研究了不同数目的控制点条件对自检校区域网平差的影响。实验结果证实采用自检校区域网平差技术可以有效地消除系统定位误差,显著提高定位精度。Launched in 2010, ＂Mapping Satellite-1＂ （TH-1） is the first stereo surveying and mapping satellite from China. During thereal operation of TH-1 in the space environment, the attitude angles of the star sensor, lens geometric parameters, and CCD undergo unpredictable changes that affect the positioning accuracy of satellite images. This study conducts serf-calibration block adjustment research on TH-1 satellite images to achieve high image positioning accuracy. The following investigation method is used in this study： First, the lens and CCD geome^c distortions of the three linear stereo surveying and mapping cameras of TH-1 are analyzed, and a serf-calibration model suitable for the satellite＇s three linear CCD images is proposed. The self-calibration block adjustment model is built for the satellite＇s three linear CCD images. Overall adjustment is then applied on exterior orientation elements and serf-calibration parameters to eliminate systematic errors present in the above observations and to improve the position- ing accuracy. Finally, the Songshan testfield is utilized to support the serf-calihration block adjustment processing for the three linear images of TH-1 and to verify the correctness and validity of the serf-calibration and serf-calibration block adjustment models. The influence of the number of control points on serf-calibration is also analyzed. Experimental results demonstrate that using the serf-calibration block adjustment technique can effectively eliminate systematic positioning errors and significantly improve positio- ning accuracy. The spatial resolution of the three linear array images of TH-1 is 5 m. After normal block adjustment, the optimal plane accuracy along the X- and Y-directions are approximately 20 m, with a height accuracyofapproximately 20 m and plane accu- racy of 4 pixels. After serf-calibration block adjustment, the optimal plane accuracy increased from 5 m to 6.5 m （ i. e. , less than 1.3 pixels）, and the height accuracy increased to 5 m. Through a series

关 键 词：“天绘一号”卫星 三线阵CCD影像 实验场 自检校模型 区域网平差 几何变形 

分 类 号：P237[天文地球—摄影测量与遥感]