摘要
受限于区域监测站及地球静止轨道(geosynchronous earth orbit, GEO)卫星的静地特性,北斗卫星导航系统(BeiDou satellite navigation system,BDS)定轨精度较差,加入低轨卫星(low earth orbit,LEO)星载数据可显著提升定轨精度。使用一种由24颗LEO卫星组成的小型低轨卫星星座,在BDS-3全星座情况下,仿真分析了导航卫星与低轨卫星联合定轨对北斗卫星轨道的提升程度。分别进行仅地面测站定轨、地面测站与LEO联合定轨试验,包含全球均匀、亚太区域、亚海分布3类测站布局。结果表明:(1)仅地面测站定轨时,GEO卫星轨道三维精度在分米量级,加入LEO观测数据后,定轨精度在厘米量级,提升程度达80%以上;(2)区域地面测站时,导航卫星轨道三维精度在分米量级,加入LEO卫星后,所有类型导航卫星定轨精度均提升至数个厘米,提升效果显著;(3)全球均匀测站时,LEO的加入仍然可提升倾斜地球同步轨道/中高轨道卫星定轨精度,提升效果在毫米至厘米量级。
Objectives:Limited by the regional distribution of ground monitoring stations and the geostatic characteristics of geostationary earth orbit(GEO) satellites, the GEO satellites of the BeiDou satellite navigation system(BDS) have poor orbit determination accuracy. The inclusion of spaceborne observation data of low-Earth orbit(LEO) satellites by processing combined precise orbit determination(CPOD) can improve the orbit determination accuracy of global navigation satellite systems(GNSS). Methods:This study simulates and analyzes the performance of CPOD with the BDS-3 full constellation and LEO satellites in enhancing the orbit determination accuracies of BDS satellites on the basis of a small LEO satellite constellation of 24 LEOs. With the simulated observation data, experiments of POD with ground stations only and CPOD with ground stations and LEOs are conducted. Three types of station networks, i.e. the global network, the Asia-Pacific regional network, and the Asia-Sea network, are discussed. Results:(1) The three dimension orbit accuracies of GEO satellites are at the decimeter magnitude in the case of POD with ground stations only. When LEO data are added, the corresponding orbit determination accuracy is at the centimeter level, with an increase of over 80%.(2) In the case of the regional station network, the three dimension root mean squares error(RMSE) of navigation satellite orbits are at the decimeter level.When LEO data are added, the orbit determination accuracies of all types of navigation satellites are several centimeters.(3) In the case of the global station network, the orbit determination accuracy of inclined GeoSynchronous orbit(IGSO) and medium Earth orbit(MEO) satellites can still be improved on an millimeter-centimeter level. Conclusions:Under the regional monitoring network, the addition of a small number of LEO satellites can significantly improve the orbit accuracy of GNSS satellites. When the global uniform/Asia-Sea network is deployed, the orbit accuracy of navigation satellites can still be slightly improved after the addition of LEO satellites. With the more LEO satellites added, the improvement of the orbit determination accuracy of navigation satellites is limited.
作者
曾添
隋立芬
贾小林
肖国锐
戴卿
甘雨
ZENG Tian;SUI Lifen;JIA Xiaolin;XIAO Guorui;DAI Qing;GAN Yu(Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450001,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;Troops 93216,Beijing 100085,China;Hunan BDS Micro Chipset Industrial Development Co.,Ltd,Changsha 410000,China)
出处
《武汉大学学报（信息科学版）》
EI
CAS
CSCD
北大核心
2022年第1期61-68,共8页
Geomatics and Information Science of Wuhan University
基金
地理信息工程国家重点实验室基金(SKLGIE2018-M-2-1)
国家自然科学基金(41674016,41874041,41904039)。
关键词
北斗三号
低轨卫星
区域测站布局
联合定轨
星座仿真
BeiDou-3 global navigation satellite system(BDS-3)
low-earth orbit(LEO)satellite
regional station network
combined orbit determination
constellation simulation
作者简介
第一作者:曾添,博士,工程师,研究方向为GNSS精密定轨与定位。tattian@126.com。
