1. Mehlen , C. D. Laurichesse Improving GPS Navigation with Orbital Filter October 1999
2. Issler , J. L. et al. High Reduction of Acquisition and Tracking Thresholds of GPS Spaceborne Receiver January 1998
3. Ananda , M. P. P. S. Jorgensen Orbit Determination of Geostationary Satellites Using GPS August 1985
4. Kronman , J. T. McElroy Considerations of Application of GPS in Satellites September 1994
5. Kronman , J. Experience Using GPS for Orbit Determination of a Geosynchronous Satellite September 2000