[국내논문]Optical Orbit Determination of a Geosynchronous Earth Orbit Satellite Effected by Baseline Distances between Various Ground-based Tracking Stations II: COMS Case with Analysis of Actual Observation Data원문보기
We estimated the orbit of the Communication, Ocean and Meteorological Satellite (COMS), a Geostationary Earth Orbit (GEO) satellite, through data from actual optical observations using telescopes at the Sobaeksan Optical Astronomy Observatory (SOAO) of the Korea Astronomy and Space Science Institute...
We estimated the orbit of the Communication, Ocean and Meteorological Satellite (COMS), a Geostationary Earth Orbit (GEO) satellite, through data from actual optical observations using telescopes at the Sobaeksan Optical Astronomy Observatory (SOAO) of the Korea Astronomy and Space Science Institute (KASI), Optical Wide field Patrol (OWL) at KASI, and the Chungbuk National University Observatory (CNUO) from August 1, 2014, to January 13, 2015. The astrometric data of the satellite were extracted from the World Coordinate System (WCS) in the obtained images, and geometrically distorted errors were corrected. To handle the optically observed data, corrections were made for the observation time, light-travel time delay, shutter speed delay, and aberration. For final product, the sequential filter within the Orbit Determination Tool Kit (ODTK) was used for orbit estimation based on the results of optical observation. In addition, a comparative analysis was conducted between the precise orbit from the ephemeris of the COMS maintained by the satellite operator and the results of orbit estimation using optical observation. The orbits estimated in simulation agree with those estimated with actual optical observation data. The error in the results using optical observation data decreased with increasing number of observatories. Our results are useful for optimizing observation data for orbit estimation.
We estimated the orbit of the Communication, Ocean and Meteorological Satellite (COMS), a Geostationary Earth Orbit (GEO) satellite, through data from actual optical observations using telescopes at the Sobaeksan Optical Astronomy Observatory (SOAO) of the Korea Astronomy and Space Science Institute (KASI), Optical Wide field Patrol (OWL) at KASI, and the Chungbuk National University Observatory (CNUO) from August 1, 2014, to January 13, 2015. The astrometric data of the satellite were extracted from the World Coordinate System (WCS) in the obtained images, and geometrically distorted errors were corrected. To handle the optically observed data, corrections were made for the observation time, light-travel time delay, shutter speed delay, and aberration. For final product, the sequential filter within the Orbit Determination Tool Kit (ODTK) was used for orbit estimation based on the results of optical observation. In addition, a comparative analysis was conducted between the precise orbit from the ephemeris of the COMS maintained by the satellite operator and the results of orbit estimation using optical observation. The orbits estimated in simulation agree with those estimated with actual optical observation data. The error in the results using optical observation data decreased with increasing number of observatories. Our results are useful for optimizing observation data for orbit estimation.
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제안 방법
(2015). Furthermore, these orbit estimation results can validate the simulation of the effect of baseline on the GEO satellite orbit estimation with optical observation from multiple observatories.
In this study, we considered actual observation data from telescopes at three observatories, the SOAO, OWL test-bed, and CNUO, to observe a GEO satellite. The first telescope is a 61-cm-diameter astronomical-observation telescope at the SOAO.
The optical observation data were obtained from several combinations of single and multiple optical observatories centered at the SOAO according to the difference in baseline distances.
In this study, we estimated the orbit of the COMS GEO satellite by using actual optical observation data. The observation was conducted at the SOAO, OWL Test-Bed, and CNUO in South Korea.
대상 데이터
In this study, we considered actual observation data from telescopes at three observatories, the SOAO, OWL test-bed, and CNUO, to observe a GEO satellite. The first telescope is a 61-cm-diameter astronomical-observation telescope at the SOAO. A charge coupled device (CCD) camera (PL16803 model produced by Finger Lakes Instrumentation) was used for capturing observational images.
11 degrees. The third telescope used in this study was a wide-field telescope of 60-cm diameter at CNUO located in Jincheon; another type of CCD camera (STX model) was used for capturing observational images. The FOV of the CNUO telescope was 1.
1990). The catalog used for WCS data processing was Guide Star Catalog (GSC), and GSC version 1.1 was used for the observation data obtained at the OWL test-bed and CNUO. A relatively early version of GSC was used because a number of stars were observed owing to the wide FOV.
3. RMS errors in RIC components of orbits estimated with simulated and actual observation data from one, two, and three observatories, centered at the SOAO.
4. RMS errors in RIC components of orbits estimated with simulated and actual observation data from one, two, and three observatories, centered at the OWL test-bed.
5. RMS errors in RIC components of orbits estimated with simulated and actual observation data from one, two, and three observatories, centered at the CNUO.
In this study, we estimated the orbit of the COMS GEO satellite by using actual optical observation data. The observation was conducted at the SOAO, OWL Test-Bed, and CNUO in South Korea. The observation campaign spanned 166 days from August 1, 2014, but the actual observation was successful only on 5 days at the CNUO, 12 days at the OWL test-bed, and 9 days at SOAO because of weather conditions and equipment issues.
성능/효과
As the number of observatories participating in orbit determination increases, results with better precision are obtained across all RIC components. Considering that the values of observation data from two observatories in the simulation were similar, it is concluded that the increase in precision with increasing number of observatories is attributable to the small amount of OWL test-bed observation data used for the orbit estimation. According to Lee et al.
In conclusion, first, the orbits estimated with simulated observation data agree with those estimated with actual optical observation data from one, two, and three observatories within an error of 300 m at worst in the radial component. Second, as the number of observatories considered in obtaining data increased from one to three, the difference between the estimated orbit and the reference orbit from TLE decreased.
In conclusion, first, the orbits estimated with simulated observation data agree with those estimated with actual optical observation data from one, two, and three observatories within an error of 300 m at worst in the radial component. Second, as the number of observatories considered in obtaining data increased from one to three, the difference between the estimated orbit and the reference orbit from TLE decreased. Third, the trend of the differences between the orbits estimated with actual optical observation data and the orbit ephemeris maintained by the satellite operator, KARI, is very similar to the trend in the comparison between the orbits estimated with actual optical observation data and reference orbits.
Second, as the number of observatories considered in obtaining data increased from one to three, the difference between the estimated orbit and the reference orbit from TLE decreased. Third, the trend of the differences between the orbits estimated with actual optical observation data and the orbit ephemeris maintained by the satellite operator, KARI, is very similar to the trend in the comparison between the orbits estimated with actual optical observation data and reference orbits. The RMS error difference in the radial component was greater than those in the other two components.
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