摘要
高分辨率对地观测卫星需要精确的姿态信息来满足后续对地定位等工作,因此姿态确定精度十分重要。星敏感器的低频误差是影响卫星姿态确定精度的重要因素之一,主要是由空间周期性的热环境变化引起的。为进一步提高卫星姿态确定精度,对星敏感器的低频误差产生机理即星敏感器主光轴做周期性扰动进行了分析,设计了星敏感器低频误差补偿方案,建立了考虑星敏感器低频误差在内的组合定姿模型,利用拓维卡尔曼滤波(AEKF)对低频误差进行补偿,并引入RTS平滑滤波进一步提高姿态确定精度。仿真实验表明,设计的星敏感器低频误差补偿方案能有效对其进行补偿,提高卫星姿态确定精度。
High-resolution earth observation satellites require precise attitude information to meet the follow-up work such as positioning, so the attitude determination accuracy is very important. The low frequency error of star tracker is one of the most critical problems for high-accuracy satellite attitude determination which is generated by the periodic thermal distortion of the optical head and the bracket of the star sensor and then yields pointing change of the optical axis. To further improve the satellite attitude, this paper design a scheme to compensate low frequency error for star sensor, the producing mechanism of low frequency error of star sensor have been analyzed, the attitude determination model have been established considering the low frequency error, by using AEKF and RTS, the satellite attitude is improved. Simulation results show that： the scheme designed to improve the accuracy of the satellite attitude is effective in this paper.
出处
《测绘科学技术学报》
CSCD
北大核心
2016年第3期252-257,共6页
Journal of Geomatics Science and Technology
