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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Impact of Eccentricity on East-West Stationkeeping for the GPS Class of Orbits
The investigation will reveal that the influence of luni-solar perturbations contributes to the growth of eccentricity, thus increasing the probability of encountering chaotic motion during a typical satgellite lifetime.
Impact of Eccentricity on East-West Stationkeeping for the GPS Class of Orbits
A strong relationship exists between eccentricity and the potential for an orbit with a mean motion commensurability to the Earth's rotation rate to be chaotic.
Spacecraft Autonomous navigation for Earth Ground Track Repeat Orbits Using GPS
This paper describes a simple empirical stategy for computing manuever times and magnitudes autonomously for Earth orbiting spacecraft with a ground track repeat requirement.
Preliminary TOPEX/Poseidon SLR and GPS Station Coordinate Calibration
TOPEX/Poseidon(T/P) is a joint altimetric mission of U.S. NASA and French CNES design launched August 10, 1992. There are a variety of tracking systems on T/P for both operational and precise orbit determination.