1. Heikki J, Reima E, Henrik V et al (2007) A variational data assimilation system for ground-based GPS slant delays. Q J R Meteorol Soc 133(625):969–980
2. Thomas P (2003) Tropospheric GPS slant delays at very low elevations. In: Proceedings of international, workshop on GPS meteorology. Institute for Geodesy and Navigation, University FAF Munich, Munich
3. Zhao H, Jiang C (2005) Phase corrections of spaceborne synthetic aperture radar in practical application. Chin J Radio Sci 20(1):48–51
4. Wang Z-B, Zhao L, Wang S-G et al (2014) COMPASS time synchronization and dissemination-Toward centimetre positioning accuracy. Sci China (Phy, Mech Astron) 57(9):1788–1804
5. Lin HT, Huang YJ, Tseng WH et al (2012) Recent development and utilization of two-way satellite time and frequency transfer. J Metrol Soc India 27(1):13–22