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日地系统L2点Halo轨道自主天文导航及精度分析

Keywords: 平动点,Halo轨道,天文导航,精度分析,扩展卡尔曼滤波

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Abstract:

针对运行于日地L2点Halo轨道探测器,给出了质心惯性坐标系和质心旋转坐标系中的探测器运动方程,并建立了以星光角距作为观测量的导航模型,采用扩展卡尔曼滤波(EKF)算法解算探测器位置,以Cramér-Rao误差下界(CRLB)为系统可观测度的度量标准分析了不同的状态量和观测量对导航性能的影响.通过数值仿真发现导航坐标系、主天体、导航恒星数目以及滤波器采样周期等因素对导航性能的影响较大,并依据平动点轨道运动学分析了以上因素对导航精度的影响.

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