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http://dx.doi.org/10.12673/jant.2022.26.6.404

Performance Analysis of GPS and QZSS Orbit Determination using Pseudo Ranges and Precise Dynamic Model  

Beomsoo Kim (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
Jeongrae Kim (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
Sungchun Bu (C4I Laboratory, LIG Nex1)
Chulsoo Lee (C4I Laboratory, LIG Nex1)
Publication Information
Journal of Advanced Navigation Technology / v.26, no.6, 2022 , pp. 404-411 More about this Journal
Abstract
The main function in operating the satellite navigation system is to accurately determine the orbit of the navigation satellite and transmit it as a navigation message. In this study, we developed software to determine the orbit of a navigation satellite by combining an extended Kalman filter and an accurate dynamic model. Global positioning system (GPS) and quasi-zenith satellite system (QZSS) orbit determination was performed using international gnss system (IGS) ground station observations and user range error (URE), a key performance indicator of the navigation system, was calculated by comparison with IGS precise ephemeris. When estimating the clock error mounted on the navigation satellite, the radial orbital error and the clock error have a high inverse correlation, which cancel each other out, and the standard deviations of the URE of GPS and QZSS are small namely 1.99 m and 3.47 m, respectively. Instead of estimating the clock error of the navigation satellite, the orbit was determined by replacing the clock error of the navigation message with a modeled value, and the regional correlation with URE and the effect of the ground station arrangement were analyzed.
Keywords
GNSS; GPS; Orbit determination; QZSS; Satellite dynamic model.;
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