Instantaneous velocity determination and positioning using Doppler shift from a LEO constellation  

作　　者：Fei Guo Yan Yang Fujian Ma Yifan Zhu Hang Liu Xiaohong Zhang 

机构地区：[1]School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China [2]Hubei Luojia Laboratory,Wuhan 430079,China [3]Institute of Telecommunication and Navigation Satellites,China Academy of Space Technology,Beijing,China

出　　处：《Satellite Navigation》2023年第1期28-40,I0002,共14页卫星导航（英文）

基　　金：the Fund of National Key Research and Development Program of China(No.2022YFB3903902);the National Science Fund for Distinguished Young Scholars(No.41825009);the Key Research and Development Program of Hubei Province(No.2022BAA054).

摘　　要：To provide backup and supplementation for the Global Navigation Satellite System(GNSS),Doppler shift from Low Earth Orbit(LEO)satellites can be used as signals of opportunity to provide positioning,navigation,and timing service.In this contribution,we frst investigate the model and performance of instantaneous velocity determination and positioning with LEO satellites.Given a LEO constellation with 288 satellites,we simulate Doppler shift observations at nine multi-GNSS experiment stations.Owing to the lower orbit,the performance of LEO velocity determination is much more sensitive to the initial receiver position error than that of GNSS.Statistical results show that with the initial receiver position error increased from 0.1 to 10 m,the Root Mean Square Errors(RMSEs)increase from 0.73 to 2.65 cm/s,0.68 to 2.96 cm/s,and 1.67 to 4.15 cm/s in the east,north,and up directions,respectively.The performances with GPS are compared with GPS+LEO,and it is found that LEO Doppler shift observations contribute to GPS velocity determination.As for LEO Doppler positioning,even if more than 30 visible LEO satellites are available,the position dilution of precision values can reach several hundreds.Assuming that the error of LEO Doppler measurements is 0.01 m/s,the instantaneous Doppler positioning accuracy can achieve about a few meters,which is comparable to that of GNSS pseudorange positioning.A constant velocity model is adopted for state transition.Static LEO Doppler positioning results show that an accuracy at centimeter to decimeter level can be achieved after solution convergence.For a static simulated kinematic positioning test,the RMSEs range from a few decimeters to several meters in diferent regions by giving diferent constraints.For a dynamic positioning test,the RMSEs are about 2–3 m in high latitude region.

关 键 词：Low earth orbit(LEO) GNSS Doppler shift Velocity determination Instantaneous Doppler positioning 

分 类 号：TN96[电子电信—信号与信息处理]