Real-time On-the-Fly Ambiguity Resolution Over Short Baselines in the Presence of Anti-Spoofing

Ming Yang, Clyde Goad, and Burkhard Schaffrin

Abstract:	Real-time on-the-fly carrier phase ambiguity resolution when Anti-Spoofing is activated is investigated using dual-frequency receivers. An integer search technique involving filtering with pseudorange and carrier phase and an apriori ionosphere condition constraint is implemented. Test results are presented. Instantaneous solutions are commonly achieved when seven satellites are in track. Very fast integer recovery typically within five epochs is obtained when there are six satellites available. With five satellites in track, the nrmiber of epochs needed normally does not exceed ten. If only four satellites are available, this technique will work but may take substantially longer time. Today’s demanding real-time engineering applications should find this technique very useful in an environment where frequent losses of lock are expected and the mlinterrupted tracking of a large number of satellites cannot be maintained for an extended period.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	519 - 525
Cite this article:	Yang, Ming, Goad, Clyde, Schaffrin, Burkhard, "Real-time On-the-Fly Ambiguity Resolution Over Short Baselines in the Presence of Anti-Spoofing," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 519-525.
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