提高航天测量船定轨精度的途径

Ways to Improve Orbit Determination Precision of Space TT&C Ships

在"神舟"任务中,航天测量船的定轨精度直接影响着整个地面测控系统的完成质量。在分析研究测量船误差源对近地近圆轨道确定影响的基础上,提出了提高海上定轨精度急需解决的问题及研究方向,建立了测速数据的船姿船速修正模型,设计了自适应信息检测算法,实现了测量船复杂误差的精确仿真并基于次序统计量研究了初轨根数的选优问题。这些技术的应用使初轨计算半长轴外符合精度提高了3倍,为提高测量船定轨精度发挥了重要作用。

In the task of Shenzhou, the orbit determination precision of space TT＆C ships influences directly the quality of earth TT＆C system. This paper bases its research on the analysis of error source＇s influence on the determination of near - earth and＇ near - circular orbit, and proposes imminent problems and research direction of improving maritime orbit determination precision. It establishes a model for adjusting ship position and speed, designs a self- adjusting information checking calculation method, realizes accurate simulation of ship complex error and researches on selection of preliminary orbit elements based on sequence statistics. By the application of these technology, the outer - accord precision of preliminary orbit calculation is improved by 3 times. The technology playes an important role in improving the orbit determination precision of space TT＆C ships.