为了提供高精度星敏感器姿态测量精度, 对三轴定姿受恒星自行影响产生误差的机理进行研究, 将恒星自行量分成Ⅰ -Ⅸ级存储在导航星库中, 并深入分析不同恒星自行量级在 20年间对三轴姿态角输出的逐年变化情况。仿真实验结果表明: 利用 QUEST方法在 20年内对三轴姿态角进行校正后精度可提高 75″以上, 在星等相近时优先选取自行量级较小的恒星进行姿态解算, 使新条件数达到最小, 大大提高工程上星敏感器姿态测量的精度和稳定性的要求。

The nonlinear photoresponse to a 1.56-\mu m infrared continuous wave laser in semi-insulating (SI) galliumarsenide (GaAs) is examined. The double-frequency absorption (DFA) is responsible for the nonlinear photoresponse based on the quadratic dependence of the photocurrent separately on the coupled optical power and bias voltage. The electric field-induced DFA remarkably affects the native DFA in SI GaAs. The surface electric field or the surface band-bending of SI GaAs significantly affects the magnitude variation of the photocurrent and dark current.