Analysis of the Effect of UTI-UTC to High Precision Orbit Propagation
As the spatial resolution of remote sensing satellites becomes higher, very accurate determination of the position of a LEO (Low Earth Orbit) satellite is demanding more than ever. Non-symmetric Earth gravity is the major perturbation force to LEO satellites. Since the orbit propagation is performed...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
1999-12-01
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| Series: | Journal of Astronomy and Space Sciences |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/1999/v16n2/OJOOBS_1999_v16n2_159.pdf |
| _version_ | 1797368579013738496 |
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| author | Dongseok Shin Sunghee Kwak Tag-Gon Kim |
| author_facet | Dongseok Shin Sunghee Kwak Tag-Gon Kim |
| author_sort | Dongseok Shin |
| collection | DOAJ |
| description | As the spatial resolution of remote sensing satellites becomes higher, very accurate determination of the position of a LEO (Low Earth Orbit) satellite is demanding more than ever. Non-symmetric Earth gravity is the major perturbation force to LEO satellites. Since the orbit propagation is performed in the celestial frame while Earth gravity is defined in the terrestrial frame, it is required to convert the coordinates of the satellite from one to the other accurately. Unless the coordinate conversion between the two frames is performed accurately the orbit propagation calculates incorrect Earth gravitational force at a specific time instant, and hence, causes errors in orbit prediction. The coordinate conversion between the two frames involves precession, nutation, Earth rotation and polar motion. Among these factors, unpredictability and uncertainty of Earth rotation, called UTI-UTC, is the largest error source. In this paper, the effect of UTI-UTC on the accuracy of the LEO propagation is introduced, tested and analzed. Considering the maximum unpredictability of UTI-UTC, 0.9 seconds, the meaningful order of non-spherical Earth harmonic functions is derived. |
| first_indexed | 2024-03-08T17:34:34Z |
| format | Article |
| id | doaj.art-374b84e8a8cd46f3b54071ca70fc251e |
| institution | Directory Open Access Journal |
| issn | 2093-5587 2093-1409 |
| language | English |
| last_indexed | 2024-03-08T17:34:34Z |
| publishDate | 1999-12-01 |
| publisher | The Korean Space Science Society |
| record_format | Article |
| series | Journal of Astronomy and Space Sciences |
| spelling | doaj.art-374b84e8a8cd46f3b54071ca70fc251e2024-01-02T13:19:05ZengThe Korean Space Science SocietyJournal of Astronomy and Space Sciences2093-55872093-14091999-12-01162159166Analysis of the Effect of UTI-UTC to High Precision Orbit PropagationDongseok Shin0Sunghee Kwak1Tag-Gon Kim2Satellite Technology Research Center, KAIST, 305-701, Taejon KoreaSatellite Technology Research Center, KAIST, 305-701, Taejon KoreaDept. Electrical and Electronic Engineering, KAISTAs the spatial resolution of remote sensing satellites becomes higher, very accurate determination of the position of a LEO (Low Earth Orbit) satellite is demanding more than ever. Non-symmetric Earth gravity is the major perturbation force to LEO satellites. Since the orbit propagation is performed in the celestial frame while Earth gravity is defined in the terrestrial frame, it is required to convert the coordinates of the satellite from one to the other accurately. Unless the coordinate conversion between the two frames is performed accurately the orbit propagation calculates incorrect Earth gravitational force at a specific time instant, and hence, causes errors in orbit prediction. The coordinate conversion between the two frames involves precession, nutation, Earth rotation and polar motion. Among these factors, unpredictability and uncertainty of Earth rotation, called UTI-UTC, is the largest error source. In this paper, the effect of UTI-UTC on the accuracy of the LEO propagation is introduced, tested and analzed. Considering the maximum unpredictability of UTI-UTC, 0.9 seconds, the meaningful order of non-spherical Earth harmonic functions is derived.http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/1999/v16n2/OJOOBS_1999_v16n2_159.pdf |
| spellingShingle | Dongseok Shin Sunghee Kwak Tag-Gon Kim Analysis of the Effect of UTI-UTC to High Precision Orbit Propagation Journal of Astronomy and Space Sciences |
| title | Analysis of the Effect of UTI-UTC to High Precision Orbit Propagation |
| title_full | Analysis of the Effect of UTI-UTC to High Precision Orbit Propagation |
| title_fullStr | Analysis of the Effect of UTI-UTC to High Precision Orbit Propagation |
| title_full_unstemmed | Analysis of the Effect of UTI-UTC to High Precision Orbit Propagation |
| title_short | Analysis of the Effect of UTI-UTC to High Precision Orbit Propagation |
| title_sort | analysis of the effect of uti utc to high precision orbit propagation |
| url | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/1999/v16n2/OJOOBS_1999_v16n2_159.pdf |
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