摘要
在Lageos卫星的精密定轨中引入了“类阻力”摄动加速度,以减小沿轨误差的影响。本文讨论了“类阻力”摄动的阻力系数CD的不同计算模式对定轨计算的影响。通过实例计算和分析比较,表明了类阻力系数CD在各个短弧上拟合的值变化较大。在一个月的长弧段内把CD作为常系数拟合求解仅是一种求平均值的近拟方法。类阻力系数CD应采用既包含长期变化又包含若干周期变化的计算模式比较合理。具体计算时该取多少项,应根据选用弧段的长短及精度要求来确定。
The drag-like perturbation acceleration is calculated in the precise orbit determination of the Lageos Satellite in order to decrease the along-track errors. In the paper, the effects of the different models of the drag-like coefficient CD on the orbit determination have been discussed. The results of the computation show that the fitted values of CD for different short arcs presented obvious variation, therefore it is only a approximate mothed evaluating mean value of CD that CD is solved as a constant parameter in the long-arc over 30-days span. A CD model contained secular term and long-periodic oscillations is reasonable. The term numbers of CD adopted in practicable calculation can be determined according to the length of fitted data arc and desired accuracy.
出处
《中国科学院上海天文台年刊》
1989年第10期96-102,共7页
Annals Shanghai Astronomical Observatory Chinese Academy of Sciences
