国产光学卫星影像几何精度研究

Research on Image Geometric Precision of Domestic Optical Satellites

受卫星设计和关键硬件制造水平的限制,我国高分辨率光学卫星影像的自主几何定位精度与国际先进水平仍有一定差距。针对在轨的国产光学卫星的影像几何精度问题,文章从误差源分析入手,提出了国产光学卫星影像几何精度提升理论和方法,通过在卫星数据处理过程中自动检测、消除包括设备安装,姿态、轨道测量,相机畸变,时间同步等多种误差,提高了卫星影像的几何精度;并对高分辨率卫星数据的几何精度提升状况进行了验证。结果表明:经过所提出的几何精度提升方法处理后,国产卫星的带控制点影像几何定位精度均可达到1.5像素,显著优于原设计指标。

Because of the defects in satellite design and key hardware manufacturing, there is still a cer- tain gap in our image geometric precision compared with the advanced level. Aiming at improving geo- metric precision of domestic high resolution optical satellites, some domestic satellite image geometric pre- cision upgrading theory and methods are presented; by detecting and eliminating various kinds of error including equipment installation error, attitude and orbit measurement error, camera distortion, time syn- chronization errors and other errors in data processing flow, the geometric precision of satellite images has been significantly improved; some geometric precision improvement experiments are executed~ via the proposed geometric processing, the geometric precision of theses satellite images can he improved to be better than 1.5 pixel,which is higher than the designed accuracy of the satellite.