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Journal Article
GPS-Based Orbit Determination for KOMPSAT-5 Satellite
- Authors
- Yoola Hwang, Byoung-Sun Lee, Young-Rok Kim, Kyoung-Min Roh, Ok-Chul Jung, Haedong Kim
- Issue Date
- 2011-08
- Citation
- ETRI Journal, v.33, no.4, pp.487-496
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- Korea Multi-Purpose Satellite-5 (KOMPSAT-5) is the first satellite in Korea that provides 1 m resolution synthetic aperture radar (SAR) images. Precise orbit determination (POD) using a dual-frequency IGOR receiver data is performed to conduct high-resolution SAR images. We suggest orbit determination strategies based on a differential GPS technique. Double-differenced phase observations are sampled every 30 seconds. A dynamic model approach using an estimation of general empirical acceleration every 6 minutes through a batch least-squares estimator is applied. The orbit accuracy is validated using real data from GRACE and KOMPSAT-2 as well as simulated KOMPSAT-5 data. The POD results using GRACE satellite are adjusted through satellite laser ranging data and compared with publicly available reference orbit data. Operational orbit determination satisfies 5 m root sum square (RSS) in one sigma, and POD meets the orbit accuracy requirements of less than 20 cm and 0.003 cm/s RSS in position and velocity, respectively. © 2011 ETRI.
- KSP Keywords
- Dynamic Models, GPS-based, GRACE satellite, High-resolution SAR images, KOMPSAT-2, Korea Multi-Purpose SATellite-5(KOMPSAT-5), Least Square(LS), Least-squares estimator, Precise Orbit Determination, Real data, Satellite Laser Ranging(SLR)