红外地球敏感器测量误差分析及修正方法

Analysis and Correction Method for Infrared Earth Sensor Measurement Error

红外地球敏感器作为卫星平台重要设备,在对地指向、姿态测量和天文自主导航等方面发挥着重要作用,高精度的地球敏感器量对于提高卫星姿态控制和天文自主导航精度具有重要意义。本文通过分析地敏测量误差的影响因素,提出随季节变化的地球CO_(2)辐射特性是影响地敏测量精度的重要因素;根据地球辐射模型构建了地敏测量修正方法,结合在轨实测数据分析验证,证明可以大大降低由地球辐射不均匀引发的误差,有效压缩地敏在轨测量误差。

As an important facility of satellite platform,infrared earth sensor plays a crucial role in nadir pointing,attitude measurement,and astronomical autonomous navigation. High precision earth sensors are of great significance to the improvement of satellite attitude control and astronomical autonomous navigation accuracy. By analyzing the factors causing the measurement error,this paper indicates that the seasonal changing infrared radiation feature of earth CO_(2)layer is an important factor affecting the accuracy of earth sensor. According to the earth infrared radiation model,a method for correcting the earth sensor measurement is constructed. With the constructed method,along with the analysis and validation using in-orbit data,the deviation caused by non-uniformly earth radiation is significantly reduced,and the in-orbit measurement error is effectively compressed.