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http://dx.doi.org/10.5140/JASS.2018.35.4.227

Validation of Geostationary Earth Orbit Satellite Ephemeris Generated from Satellite Laser Ranging  

Oh, Hyungjik (Department of Astronomy, Yonsei University)
Park, Eunseo (Korea Astronomy and Space Science Institute)
Lim, Hyung-Chul (Korea Astronomy and Space Science Institute)
Lee, Sang-Ryool (Korea Aerospace Research Institute)
Choi, Jae-Dong (Korea Aerospace Research Institute)
Park, Chandeok (Department of Astronomy, Yonsei University)
Publication Information
Journal of Astronomy and Space Sciences / v.35, no.4, 2018 , pp. 227-233 More about this Journal
Abstract
This study presents the generation and accuracy assessment of predicted orbital ephemeris based on satellite laser ranging (SLR) for geostationary Earth orbit (GEO) satellites. Two GEO satellites are considered: GEO-Korea Multi-Purpose Satellite (KOMPSAT)-2B (GK-2B) for simulational validation and Compass-G1 for real-world quality assessment. SLR-based orbit determination (OD) is proactively performed to generate orbital ephemeris. The length and the gap of the predicted orbital ephemeris were set by considering the consolidated prediction format (CPF). The resultant predicted ephemeris of GK-2B is directly compared with a pre-specified true orbit to show 17.461 m and 23.978 m, in 3D root-mean-square (RMS) position error and maximum position error for one day, respectively. The predicted ephemeris of Compass-G1 is overlapped with the Global Navigation Satellite System (GNSS) final orbit from the GeoForschungsZentrum (GFZ) analysis center (AC) to yield 36.760 m in 3D RMS position differences. It is also compared with the CPF orbit from the International Laser Ranging Service (ILRS) to present 109.888 m in 3D RMS position differences. These results imply that SLR-based orbital ephemeris can be an alternative candidate for improving the accuracy of commonly used radar-based orbital ephemeris for GEO satellites.
Keywords
geostationary Earth orbit (GEO) satellite; orbit determination (OD); orbital ephemeris; satellite laser ranging (SLR);
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