空间系统

[中文适用范围]： 本文件描述了在任务阶段（包括任何任务寿命延长）后对航天器、运载火箭、上级火箭和相关低地球轨道交叉轨道碎片的轨道寿命进行长期轨道寿命预测的过程。该文件还阐明了：a) 太阳和地磁活动建模的建模方法和资源；b) 大气模型选择的资源；c) 航天器弹道系数估计的方法。 [外文原描述]： This document describes a process for the long-duration orbit lifetime prediction of orbit lifetime for spacecraft, launch vehicles, upper stages and associated debris in LEO-crossing orbits after mission phase (including any mission lifetime extensions). The document also clarifies: a) modelling approaches and resources for solar and geomagnetic activity modelling; b) resources for atmosphere model selection; c) approaches for spacecraft ballistic coefficient estimation.