摘要
低轨卫星(LEO)星载观测数据可削弱导航星精密定轨时对地面站的依赖性。分析了在全球测站均匀但不均衡、国内区域测站加入我国南北极测站、仅国内区域测站3种测站布局情况下,加入LEO进行联合定轨时LEO对导航星定轨的增强程度。使用双星GRACE和地面实测数据进行了定轨实验分析,并对轨道进行1 d预报。结果表明,3种测站布局加入LEO后定轨精度一维RMS分别提高了6 mm、2.7 cm和2.5 dm,提高程度分别在19.5%、38.2%、63.1%,区域测站提高最为明显,加入我国南北极测站定轨精度提高至5 cm以内;切向、法向、径向均有相应程度的提高,切向稍大;轨道预报精度分别提高了15.3%、28.9%、66.0%,与定轨精度提高程度相一致。
The satellite-based observations of low earth orbits satellite（ LEO） can weaken the dependency of ground-based observations when determining navigation satellite orbit. Three station layouts are analysed which include the uniform but not balanced observation stations located in global,stations located both in China,southern,and northern polar,and only China regional stations. And the experiments are carried to enhance intensity of orbit precision when adding LEO observations. Double star of GRACE and GPS are used to do orbit determination experiments,and to predict the orbit with the length of one day. The results show that the 1 D RMSs of three station layouts improve 6 mm,2.7 cm,2.5 dm,and degrees of improvement are 19.5%,38.2%,63.1%,respectively. Regional distribution has the most notable precision improvement,and precision of the layout combining China regional area and polar stations is raised to within 5 cm. Degrees of improvement are uniform in R,T,N direction,and that of T direction is slightly better. The orbit prediction precision of three station layouts improve respectively15.3%,28.9%,66.0%,and it is in accordance with orbit precision in improvement degree.
出处
《测绘科学技术学报》
CSCD
北大核心
2017年第5期445-450,共6页
Journal of Geomatics Science and Technology
基金
国家自然科学基金项目(41674016
41274016)
关键词
低轨卫星
联合定轨
测站布局
轨道增强
轨道预报
low earth orbits satellite
combined orbit determination
station layout
orbit enhancement
orbit pre-diction
