基于遥测数据的定点自旋卫星姿态选优方法

A telemetry-based method to optimize the attitude of an on-orbit spin stabilized geostationary satellite

自旋姿态确定和控制都是由地面完成,由于几何观测条件限制、测量误差和计算方法不同,姿态确定结果往往不一致,进而影响到姿态应用和控制精度.充分利用卫星定点后,星上红外地球敏感器对地观测弦宽变化规律,确定了自旋轴与轨道法向夹角与地球测量弦宽关系,推导了由卫星下传遥测数据差分值计算自旋轴与轨道法向夹角的计算公式,由于消除了测量数据系统差,精度得到了很大提高,在此基础上提出的姿态选优算法可以从不同定姿结果中选出最接近卫星真实情况的姿态.该方法已经在我国在轨自旋卫星日常测控中得到应用.

The attitude of a spin stabilized geostationary satellite is normally determined and controlled by the mission control center on the ground, thus its attitude determination varies with the geometric measuring restriction, measurement error, and different calculation algorithms which affects the attitude control precision. The relationship between the actual attitude deviation and different value of the earth arc length measured by an on-board infrared sensor was analyzed. Then a formula based on telemetry data to calculate the actual attitude deviation was deduced, and the angle between the spin axis of an on-orbit geostationary satellite and its orbit Cross-Track direction was determind. The measure error was eliminated and the control precision was improved. It can be used as a criterion to choose the most reliable attitude among the attitude determination resuits. The proposed method has been successfully applied to the control of FY-2 on-orbit spin stabilized geosta- tionary satellite of China.