Comparison of Different On-The-Fly Ambiguity Resolution Techniques

Gunter Hein and Wolfgang Werner

Abstract:	On-the-fly carrier phase ambiguity resolution is a key element for high-precision centimeter-level kinematic DGPS positioning in real-time. Different techniques have been developed and investigated within the last years. Sequential square root information filtering combined with Bayesian statistics turned out to be one of the most promising approaches. Due to its achievable computational speed it is well suited for kinematic real-time applications, where a measurement update rate of at least 1 Hz is needed. At IfEN (Institute of Geodesy and Navigation) different ambiguity resolution techniques have been developed and implemented. A combination of Teunissen’s LAMBDA (Least-squares AMBiguity Decorrelation Adjustment) method and the time- optimized search proposed by Euler and Landau using different search-tree algorithms have been investigated. Extensive kinematic real-time tests have been conducted by car using the high-precision DGPS navigation system PHARAO (Phase Ambiguity Resolution Applications On-the-fly) developed at IfEN. This paper describes some ambiguity resolution techniques in detail. Furthermore, the used algorithms, software and hardware design of PHARAO are outlined. The results of the tests and a comparison of the algorithms’ performance are given.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1137 - 1144
Cite this article:	Hein, Gunter, Werner, Wolfgang, "Comparison of Different On-The-Fly Ambiguity Resolution Techniques," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1137-1144.
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