CHIPADE, Radhika A., and Thekke Variyam RAMANATHAN. 2021. “Extended Kalman Filter Based Statistical Orbit Determination for Geostationary and Geosynchronous Satellite Orbits in BeiDou Constellation”. Contributions to Geophysics and Geodesy 51 (1):25-46. https://doi.org/10.31577/congeo.2021.51.1.2.