1. Gratton, L.: Orbit ephemeris monitors for category I local area augmentation of GPS. M.S. thesis, Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technology, Chicago, July 2003
2. Gratton, L., Pervan, B., Pullen, S.: Orbit ephemeris monitors for category I LAAS. In: Position Location and Navigation Symposium. IEEE (2004)
3. Lee, J., Pullen, S., Enge, P., et al.: Monitoring global positioning system satellite orbit errors for aircraft landing systems. J. Aircr. 43(3), 799–808 (2006)
4. Li, L.: Research on monitoring and positioning technology of land-based augmentation system. Harbin Engineering University (2012)
5. Ni, Y.: GNSS civil aviation navigation service performance evaluation. Civil Aviation University of China (2016)