【摘要】 针对利用全球卫星导航系统(GNSS)星间链路实现用户航天器定轨时存在的链路资源有限问题,构建基于GNSS星间链路的用户航天器定轨模型,设计了应用流程,重点研究了星间链路测量频度、可建立链路数量等链路规划模式对用户航天器定轨结果的影响,并分别针对高轨用户航天器和中低轨用户航天器进行仿真分析和试验验证。结果表明:用户航天器与GNSS卫星建立星间链路的频度越高、数目越多,动力学法轨道改进的效果越好;对高轨用户航天器采用广播星历,即使每6h只有1条观测链路,也可以获得40m以内的定轨精度;对低轨用户航天器采用精密星历,当每次观测链路增加到5条时,基本可以获得1m以内的定轨精度。更多还原

【Abstract】 Considering the limited resource of GNSS(Global Navigation Satellite System)crosslink,an orbit determination model is established based on GNSS crosslink,application process is designed and the impacts of crosslink measurement frequency and crosslink number on orbit determination accuracy are especially studied.Experiments of high-orbit and low-orbit user spacecraft are conducted respectively.Results show that dynamic orbit improvement gets better with more frequent planning and more links;for high-orbit user spacecraft using broadcast ephemeris,orbit accuracy can reach within 40 m with one observation link every 6hours;for low-orbit user spacecraft using precise ephemeris,the accuracy is around 1m with 5links every time.更多还原