一种近地航天器脉冲星地固系动力学定轨方法  

A Method of Pulsar-Based Dynamic Orbit Determination in the Earth-Fixed Reference Frame for Near-Earth Spacecraft

作　　者：黄良伟[1] 帅平[1] 张新源[1] 林晴晴[1] 

机构地区：[1]中国空间技术研究院钱学森空间技术实验室,北京100094

出　　处：《宇航学报》2016年第8期895-900,共6页Journal of Astronautics

基　　金：国家自然科学基金(61403391;41304006)

摘　　要：为改善近地航天器脉冲星导航的定轨精度,设计一种地固系动力学定轨方法。该方法结合了更精确的地球引力场模型,在求地球引力势梯度基础上引入惯性力,建立了地固系下轨道动力学方程;并结合脉冲相位量测,使用扩展卡尔曼滤波实现航天器轨道参数实时估计。此方法可以降低动力学方程非线性度,尤其适用于地球静止轨道卫星。通过数学仿真校验了新方法的有效性与精度。To improve the navigation accuracy by properly incorporating the Earth gravity model in the near-Earth spacecraft pulsar-based navigation,this paper proposes the method of dynamic orbit determination in the Earth-fixed reference frame. Based on the geopotential and the inertial force model,the obit dynamics equation is constructed in the Earth-fixed reference frame. The pulse phase measurement is used in the extended Kalman filter for real-time estimation.The proposed method decreases the nonlinearity of the dynamics equation, which is especially applicable for the geostationary satellites. Numerical simulation validates the effectiveness and the accuracy of this method.

关 键 词：X射线脉冲星 动力学定轨 地固系 地球引力势 

分 类 号：P128.4[天文地球—天体测量]