Precise Point Positioning for Real-time Determination of Co-Seismic Crustal Motion

P. Collins, J. Henton, Y. Mireault, P. Héroux, M. Schmidt, H. Dragert, S. Bisnath

Abstract:	Various agencies around the world are looking at GPS to play a role in tsunami warning systems. The Geological Survey of Canada has begun a pilot project on Vancouver Island, using the Western Canada Deformation Array to determine co-seismic displacement from a real-time network solution. The Geodetic Survey Division is investigating whether real-time PPP could be used to as part of a wider or denser network. Recent developments in Ambiguity Resolution (AR) for PPP may help the effectiveness of the technique in general and reduce the time to convergence in particular. Using a subset of WCDA stations contributing to the pilot project, we have found that horizontal position determination with PPP is improved by AR by ~30%. Vertical position determination remains week and is not, on average, improved by AR, although the improvement at individual stations can be significant. Convergence remains the Achilles heal of PPP and the improvement provided by Ambiguity Resolution is not clear-cut. While individual solutions can converge in 10 minutes or less, a consistent level of convergence is elusive. The most likely reason is due to the influence of remaining errors and the relatively short wavelength of the ionosphere-free carrier phase. However, it is also conceivable that the standard estimation and validation techniques for ambiguity resolution may need to be generalized for PPP.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	2479 - 2488
Cite this article:	Collins, P., Henton, J., Mireault, Y., Héroux, P., Schmidt, M., Dragert, H., Bisnath, S., "Precise Point Positioning for Real-time Determination of Co-Seismic Crustal Motion," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2479-2488.
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