1. Collins J P, Langley R B. A tropospheric delay model for the user of the Wide Area Augmentation System. Final contract report for Nav Canada, Department of Geodesy and Geomatics Engineering Technical Report No. 187, University of New Brunswick, Fredericton, N.B., Canada, 1997
2. Collins J P, Langley R B. The Residual Tropospheric Propagation Delay: How Bad Can It Get? In: ION GPS 1998, September 15–18, Nashville, Tennessee, USA, 1998. 729–738
3. Qu W J, Zhu W Y, Song S, et al. The Evaluation of Precision about Hopfield, Saastamoinen and EGNOS Tropospheric Delay Correction Model (in Chinese). Acta Astronom Sin, 2008, 49: 113–122
4. RTCA/DO-229C. Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System Airborne Equipment. SC-169, RTCA, Inc., Washington D.C., 2001
5. Dodson A H, Chen W, Baker H C, et al. Assessment of EGNOS tropospheric correction model. In: ION GPS 1999, September 14–17, Nashville, Tennessee, USA, 1999. 1401–1407