SBAS-based Single and Dual Frequency Precise Point Positioning

L. Wanninger and A. Hesselbarth

Abstract:	Satellite based Augmentation Systems (SBAS) provide a valuable source of GPS orbits and satellite clock correc-tions. Although these data streams are intended for code based meter accurate positioning, we used them for carri-er-phase based Precise Point Positioning (PPP). All our results are based on static dual frequency observation data from sites of the International GNSS Service (IGS) or other Continuously Operating Reference Stations (CORS). We mainly produced daily coordinate sets. Among the 4 active SBAS (WAAS, EGNOS, GAGAN, MSAS) WAAS performed best. We found only small (< 10 cm) biases with respect to ITRF 2008 and a repeatabil-ity on the few cm level in all three components. The other SBAS, and esp. EGNOS and MSAS, results show larger biases with respect to ITRF. Similar results were computed for the orbit and clock in-formation from the GPS broadcast messages. Here, only small biases exist, mostly smaller 10 cm. Repeatability is on the 10 to 20 cm level in all three coordinate compo-nents. We also performed single frequency data processing with the same data sets from these high-grade GPS equip-ments. Here, a clear accuracy advantage is visible of the ionosphere-free combination of single frequency code and carrier phase observations over applying corrections from the SBAS or broadcast ionosphere model to the single frequency carrier-phase (and code) observations.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	3735 - 3741
Cite this article:	Wanninger, L., Hesselbarth, A., "SBAS-based Single and Dual Frequency Precise Point Positioning," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 3735-3741.
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