Developing Carrier-Phase Differential Global Positioning System Networks with Partial Derivative Algorithms
Publication: Journal of Surveying Engineering
Volume 128, Issue 2
Abstract
Centimeter-to-decimeter-level positioning accuracy from the global positioning system (GPS) requires the use of carrier-phase measurements. The system is generally operated in a double differential mode in which a nearby reference station is used to calibrate for errors in the satellite differential measurements. For large-scale applications, a network of multiple differential reference stations is necessary. This paper describes the major errors affecting differential GPS (DGPS) applications, how a network of reference stations can be used to estimate these errors, and one method of implementing carrier-phase network differential GPS (CP-NDGPS) using partial derivative algorithms (PDAs). PDAs can be implemented by a network service provider and are used to estimate spatial and nonspatial signal errors that cannot be measured by a single GPS reference station. For networks having numerous reference stations, a PDA is an efficient method of transmitting information though a data link to the network users. Such a system is also capable of reducing DGPS errors. Of the networks studied during this project, DGPS errors were reduced 30 to 90%.
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Information
Published In
Journal of Surveying Engineering
Volume 128 • Issue 2 • May 2002
Pages: 39 - 60
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jun 9, 2000
Accepted: May 16, 2001
Published online: Apr 15, 2002
Published in print: May 2002
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