“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
- 2015年19卷第2期 页码:219-227
纸质出版日期: 2015
DOI: 10.11834/jrs.20153334
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纸质出版日期: 2015 ,
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[1]张艳,王涛,冯伍法,元朝鹏,王淑香.“天绘一号”卫星三线阵CCD影像自检校区域网平差[J].遥感学报,2015,19(02):219-227.
ZHANG Yan, WANG Tao, FENG Wufa, et al. Self-calibration block adjustment for Mapping Satellite-1 three linear CCD image[J]. Journal of Remote Sensing, 2015,19(2):219-227.
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 self-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 geometric distortions of the three linear stereo surveying and mapping cameras of TH-1 are analyzed
and a self-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 self-calibration parameters to eliminate systematic errors present in the above observations and to improve the positioning accuracy. Finally
the Songshan testfield is utilized to support the self-calibration block adjustment processing for the three linear images of TH-1 and to verify the correctness and validity of the self-calibration and self-calibration block adjustment models.The influence of the number of control points on self-calibration is also analyzed. Experimental results demonstrate that using the self-calibration block adjustment technique can effectively eliminate systematic positioning errors and significantly improve positioning 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 accuracy of 4 pixels. After self-calibration block adjustment
the optimal plane accuracy increased from 5 m to 6. 5 m( i. e.
less than1. 3 pixels)
and the height accuracy increased to 5 m. Through a series of experimental research and analysis
the following conclusions can be drawn:( 1) The auxiliary orbit and attitude determination files of the three linear CCD images of TH-1 contain clear systematic errors. A certain degree of geometric deformation also exists in the camera lens and CCD component. For direct space intersection using orbit and attitude determination files
a prominent systematic positioning error must be eliminated through the block adjustment approach.( 2) If the self-calibration parameter Xsand its observation equation are not considered
Eq.( 10)becomes the normal block adjustment model. Normal block adjustment considers only the control point error Xgand exterior orientation element error X; thus
it corrects only the attitude errors. Although normal block adjustment can effectively eliminate the positioning error caused by the attitude angle error
the impact of the lens and CCD component geometric deformation parameters still exists. The variation of the latter parameters is minor in a medium period
and the residual errors in the plane and elevation direction are still systemic.( 3) Applying self-calibration block adjustment to the three-line array images of TH-1 with the self-calibration model presented in this paper can effectively eliminate the attitude errors and the combined effects of the focal length change
lens
and CCD geometric deformation and significantly improve positioning accuracy. The residual systematic errors of the checkpoints are effectively eliminated after self-calibration adjustment
which confirms the correctness and effectiveness of the self-calibration parameter and self-calibration block adjustment models presented in this paper.( 4) Increasing the control points can efficiently improve the accuracy of self-calibration block adjustment in an appropriate range
but when the number of control points reaches a certain degree
the adjustment accuracy stabilizes.
“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
Mapping Satellite-1(TH-1)thee linear CCD imagetestfieldself-calibration modelblock adjustmentgeometric distortion
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