L1 RTK System with Fixed Ambiguity: What SBAS Ranging Brings

Alexey Boriskin, Dmitry Kozlov, and Gleb Zyryanov

Abstract:	Given paper deals with centimeter level L1 RTK systems. L1 and L1&L2 RTK provide the same centimeter level accuracy for short baselines. However, unlike expensive L1/L2 RTK, with cheaper L1 RTK one cannot expect too fast (seconds) On-The-Fly (OTF) ambiguity resolution, which delivers cm accuracy. Known disadvantages of L1 RTK system (compared to L1&L2) are baseline length restriction (typically 10 km) and noticeable performance degradation under shaded sky. Augmented GPS constellation can mitigate these disadvantages. It is known that SBAS Satellites provide not only long/fast/ionosphere corrections. They are also a source of GPS-like signal which pseudo range and carrier phase measurements can be potentially used in positioning together with GPS measurements. Given paper proves that SBAS measurements can make a good job to augment GPS L1 RTK. We give a lot of real life collected statistic (with WAAS, EGNOS and in less degree MSAS) which demonstrate dramatic performance enhancement of L1 RTK thanks to using SBAS. The data used for validation were collected with Magellan ProMark3 and DG14 receivers supporting L1 GPS+SBAS RTK.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	2196 - 2201
Cite this article:	Boriskin, Alexey, Kozlov, Dmitry, Zyryanov, Gleb, "L1 RTK System with Fixed Ambiguity: What SBAS Ranging Brings," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 2196-2201.
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