1. Demonstration of GPS orbitdetermination enhancement by resolution of carrier phase ambiguity (abstract);Abbot;Eos Trans. AGU,1987
2. Interferometric determination of GPS satellite orbits;Abbot,1985
3. GPS orbit determination;Abbot,1986
4. Assessment of GPS accuracy on a 250-km baseline (abstract);Abbot;Eos Trans. AGU,1986
5. Demonstration of 5 to 20 parts per billion repeatability for a continental baseline estimated with multi-day GPS orbits (abstract);Bertiger;Eos Trans. AGU,1987