【作者】 樊超； 李英才； 易红伟；

【Author】 FAN Chao, LI Ying-cai, YI Hong-wei (Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi′ an 710068, China)

【机构】 中国科学院西安光学精密机械研究所；

【摘要】 高分辨率星载TDI-CCD相机在成像过程中,偏流角会对相机的成像质量产生影响。因此根据卫星轨道方程给出了偏流角和偏流角角速度随纬度变化的具体形式,基于此分别研究了偏流角在卫星穿航方向和沿航方向引起的像移量和它对相机成像质量的影响。结果表明,偏流角是纬度的函数,由它引起的像移在穿航方向对相机像质的影响较为严重,必须加以校正。并针对极地圆轨道详细计算了像移对像质的影响程度和在MTF偏流角>0.95的情况下偏流角需要调整的最小时间间隔。更多还原

【Abstract】 The image quality of the TDI-CCD camera will be affected by the drift angle, the detail format of the drift angle is given based on the orbit equation. Then, the influence of the image motion due to the drift angle on the image quality for the along and across track is researched respectively. The results show that the drift angle is the function of the latitude, and the effect of the image motion on the image quality for the across track is more serious than that for the along track, so the drift angle must be compensated. At last,the image motion and the regulation interval for MTFdrift>0.95 is computed amply for the round polar orbit.更多还原