Real-Time Precise Point Positioning in NAD83: Global and Regional Broadcast Corrections Compared
Publication: Journal of Surveying Engineering
Volume 139, Issue 1
Abstract
Real-time precise point positioning (PPP) is possible through the availability of the real-time satellite orbit and clock corrections to broadcast ephemeris, the real-time broadcast corrections (BCs). The real-time BCs are currently available in global as well as in regional reference frames. In this contribution, PPP usage and the performance of these global and regional BCs are analyzed for the North American Datum of 1983 (NAD83). The limitations of the current regional BC approach for NAD83 are identified and the coordinate differences it leads to compared with the traditional global BC approach are shown. Although the biases as a result of the different reference frame usage are shown to be subcentimeter, it is also shown how they can be reduced or eliminated by modifying either the PPP algorithm or the regional BC approach. Analyses were performed for three different PPP variants, a single-frequency ionosphere-free variant, a dual-frequency ionosphere-free variant, and a single-frequency ionosphere-corrected variant.
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Acknowledgments
P.J.G. Teunissen is the recipient of an Australian Research Council (ARC) Federation Fellowship (Project No. FF0883188). Part of this work was done in the framework of Project 1.01 of the Cooperative Research Centre for Spatial Information (CRC-SI2). Observation data and broadcast corrections of the analysis have been made available by the Real-Time IGS Pilot Project. The North American digital terrain model was extracted from the global DTM2006.0 for this work by Dr. Christian Hirt. All of this support is gratefully acknowledged.
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Published In
Journal of Surveying Engineering
Volume 139 • Issue 1 • February 2013
Pages: 1 - 10
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 18, 2012
Accepted: May 24, 2012
Published online: May 29, 2012
Published in print: Feb 1, 2013
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