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- Title
ARMA Prediction of SBAS Ephemeris and Clock Corrections for Low Earth Orbiting Satellites.
- Authors
Kim, Jeongrae; Kim, Mingyu
- Abstract
For low earth orbit (LEO) satellite GPS receivers, space-based augmentation system (SBAS) ephemeris/clock corrections can be applied to improve positioning accuracy in real time. The SBAS correction is only available within its service area, and the prediction of the SBAS corrections during the outage period can extend the coverage area. Two time series forecasting models, autoregressive moving average (ARMA) and autoregressive (AR), are proposed to predict the corrections outside the service area. A simulated GPS satellite visibility condition is applied to the WAAS correction data, and the prediction accuracy degradation, along with the time, is investigated. Prediction results using the SBAS rate of change information are compared, and the ARMA method yields a better accuracy than the rate method. The error reductions of the ephemeris and clock by the ARMA method over the rate method are 37.8% and 38.5%, respectively. The AR method shows a slightly better orbit accuracy than the rate method, but its clock accuracy is even worse than the rate method. If the SBAS correction is sufficiently accurate comparing with the required ephemeris accuracy of a real-time navigation filter, then the predicted SBAS correction may improve orbit determination accuracy.
- Subjects
LOW earth orbit satellites; GLOBAL Positioning System; EPHEMERIS Time; BOX-Jenkins forecasting; TIME series analysis; PREDICTION models
- Publication
International Journal of Aerospace Engineering, 2015, Vol 2015, p1
- ISSN
1687-5966
- Publication type
Article
- DOI
10.1155/2015/165178