Abstract
: The primary objective of this paper is to present a practical, fast, and effective triple-difference algorithm for precision orbit determination (POD) of low earth orbiters (LEOs). This technique was developed for near-real-time POD to support occultation data processing, as well as atmospheric data retrieval from the land-based GPS network. In particular, the paper focuses on the GPS/LEO POD, with special emphasis on the triple-difference–based kinematic approach to LEO POD. The paper provides the theoretical foundation of the method, and presents the results of a performance analysis for the CHAMP (CHAllenging Minisatellite Payload) satellite POD. In addition, data screening and quality control procedures applied to CHAMP and ground station GPS data are presented, with preliminary statistics related to the number and distribution of cycle-slip events. A comparison of the results from two cycle-slip detection methods is also included.
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