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Developing Carrier-Phase
Differential Global Positioning System Networks with Partial Derivative
Algorithms
2002
Award Winner
Christopher C. Varner, The MITRE Corporation
M. Elizabeth Cannon, University of Calgary
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 through a data link to the network
of 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%.
» Download Paper from the ASCE Web site
Publication
Copyright © 2003 ASCE.
Reprinted from Journal of Surveying Engineering, Vol. 128,
No. 2, May 2002, pp. 39–60.
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