Modeling and Compensation of Timing and Spatial Ephemeris Errors of Non-Cooperative LEO Satellites With Application to PNT

作     者：Hayek, Samer Kassas, Zaher M. 

作者机构：The Ohio State University ColumbusOH43210 United States 

出 版 物：《IEEE Transactions on Aerospace and Electronic Systems》 (IEEE Trans. Aerosp. Electron. Syst.)

年 卷 期：2025年第61卷第3期

页      面：5579-5593页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 08[工学] 0706[理学-大气科学] 0813[工学-建筑学] 0825[工学-航空宇航科学与技术] 0814[工学-土木工程] 

基　　金：This work was supported in part by the Air Force Office of Scientific Research (AFOSR) under Grant FA9550-22-1-0476  in part by the National Science Foundation (NSF) under Grant 2240512  and in part by the U.S. Department of Transportation under Grant 69A3552348327 for the CARMEN+ University Transportation Center 

主　　题：Error compensation 

摘      要：The modeling and compensation of timing and spatial ephemeris errors of low Earth orbit (LEO) satellites is considered. First, models are derived capturing the effect of temporal and spatial errors of publicly available uncertain LEO ephemerides on pseudorange, carrier phase, and Doppler measurements. Next, a scheme is developed to enable rapid compensation of timing and spatial ephemeris errors. The scheme utilizes a stationary receiver with a known position, extracting opportunistically pseudorange, carrier phase, or Doppler measurements from LEO downlink signals. An unscented Kalman filter-based LEO tracking framework is developed, which employs the derived spatial and temporal error models. A simulation study is presented to evaluate the developed scheme with multiconstellation LEO satellites: Starlink, OneWeb, Orbcomm, and Iridium NEXT. It is demonstrated that the proposed scheme reduces the satellite s initial position error from several kilometers to hundreds of meters. It is also demonstrated that the proposed scheme is more robust to initial satellite position error than direct LEO satellite tracking. Monte Carlo experimental results are presented to demonstrate the efficacy of the error compensation scheme to localize a stationary receiver with 1) carrier phase;and 2) Doppler measurements from three Starlink and two OneWeb noncooperative LEO satellites. Starting with an initial 3-D error of 11 316 m, it is shown that utilizing SGP4-propagated LEO ephemerides results in an error of 1) 1186 m;and 2) 1109 m, respectively;while the proposed refined ephemerides results in an error of 1) 3.18 m;and 2) 7.91 m, respectively. © 1965-2011 IEEE.