TDICCD相机的卫星姿态稳定度确定

为解决卫星平台振动造成的图像质量下降问题，提高TDI CCD相机成像质量，分析了卫星姿态稳定度的范围及影响。讨论了卫星平台振动与TDI CCD成像质量的相关性，推导了卫星平台姿态稳定度和像移的关系公式，得出TDI CCD相机对卫星姿态稳定度的要求与轨道高度以及积分级数有关。实验验证了公式推导，结果显示：轨道高度越高，积分级数越大，对卫星姿态稳定度的要求就越严格。数据表明：轨道高度在200～1000 km变化时，对卫星姿态稳定度的要求从0.0377 rad/s提升至0.00635 rad/s；TDI CCD 相机的积分级数在1～100间变化时，对卫星姿态稳定度的要求从0.014 rad/s提升到0.00014 rad/s。本文工作确定了卫星姿态稳定度和轨道高度以及积分级数的关系，有助于TDI CCD成像质量的提升。

Confirmation of satellite attitude stabilization for TDI CCD camera

To solve the image degradation caused by satellite platform vibration and to improve TDI CCD image quality, the range of satellite attitude stabilization and its effect were analyzed .First, the dependence of the satellite platform vibration on the TDI CCD image quality was discussed .Then, equations which gave the rela-tionship between image motion and attitude stabilization were derived .Finally, it was concluded that the satel-lite attitude stabilization was relevant to orbit altitudes and integral stages .The experiment results indicate that the higher the orbit altitude is and the bigger the integral stages are , the more rigorous the requirement of sat-ellite attitude stabilization is.From obtained data, it is demonstrated that when the orbit altitude changes from 200 km to 1 000 km, the requirement of satellite attitude stabilization need to improve from 0.037 7 to 0.006 35 rad/s.Meanwhile, when the integral stages change from 1 to 100, the requirement of satellite atti-tude stabilization need to be improved from 0.014 to 0.000 14 rad/s.The work in this paper confirms the re-lationships of satellite attitude stabilization , orbit altitudes and integral stages, which contributes to improve TDI CCD image quality.