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We describe a concept for realizing a high performance space-time reference using a stable atomic clock in a precisely defined orbit and synchronizing the orbiting clock to high-accuracy atomic clocks on the ground. The synchronization would be accomplished using a two-way lasercom link between ground and space. The basic approach is to take advantage of the highestperformance cold-atom atomic ...

The limited accuracy of empirical thermospheric density models is a major contributor to force model errors in orbit determination and orbit prediction for satellites such as ERS and Envisat. Although orbit accuracy has steadily improved due to advances in gravity field modeling and tracking systems, strong evidence of errors in density models have remained apparent in the orbit determination r...

In the orbit determination procedure described in this paper, the set of physical quantities fitted in the computations is not the set of basic measurements made by the ground stations. Rather, it uses the basic measurements on a pass-by-pass basis, together with a preliminary estimate of the orbit, to determine a fictitious position of the tracking station for each pass. It can be shown that t...