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학술지 Orbit Determination Performances Using Single- and Double-Differenced Methods: SAC-C and KOMPSAT-2
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저자
황유라, 이병선, 김해동, 김재훈
발행일
201101
출처
Advances in Space Research, v.47 no.1, pp.138-148
ISSN
0273-1177
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.asr.2010.07.027
초록
In this paper, Global Positioning System-based (GPS) Orbit Determination (OD) for the KOrea-Multi-Purpose-SATellite (KOMPSAT)-2 using single- and double-differenced methods is studied. The requirement of KOMPSAT-2 orbit accuracy is to allow 1 m positioning error to generate 1-m panchromatic images. KOMPSAT-2 OD is computed using real on-board GPS data. However, the local time of the KOMPSAT-2 GPS receiver is not synchronized with the zero fractional seconds of the GPS time internally, and it continuously drifts according to the pseudorange epochs. In order to resolve this problem, an OD based on single-differenced GPS data from the KOMPSAT-2 uses the tagged time of the GPS receiver, and the accuracy of the OD result is assessed using the overlapping orbit solution between two adjacent days. The clock error of the GPS satellites in the KOMPSAT-2 single-differenced method is corrected using International GNSS Service (IGS) clock information at 5-min intervals. KOMPSAT-2 OD using both double- and single-differenced methods satisfies the requirement of 1-m accuracy in overlapping three dimensional orbit solutions. The results of the SAC-C OD compared with JPL's POE (Precise Orbit Ephemeris) are also illustrated to demonstrate the implementation of the single- and double-differenced methods using a satellite that has independent orbit information available for validation. © 2010 COSPAR. Published by Elsevier Ltd. All rights reserved.
키워드
Ambiguity, Clock, Double-difference, IGS, Orbit determination, Single-difference
KSP 제안 키워드
Clock Error, Double-difference, GPS Receiver, GPS Time, Gps data, KOMPSAT-2, Local time, Orbit accuracy, Orbit determination, Positioning errors, SAC-C