Talk
Abstract:
Estimation of DGPS Carrier-Phase Errors Using a Reference Receiver
Network
John Raquet
Air force Institute of Technology (and the University of Calgary)
John.Raquet@afit.af.mil
Current
approaches for obtaining the most accurate GPS positioning,
based upon differential carrier-phase ambiguity resolution,
encounter significant performance degradation as the distance
between the mobile and reference receiver increases. This presentation
will describe an approach for using a network of reference receivers
to perform precise, cm-level positioning over a large geographical
region. This approach, called NetAdjust, is a linear minimum
variance of error estimator, and it can be shown that it is
equivalent to least-squares collocation and also to a least-squares
condition adjustment. All three of these "viewpoints" provide
unique insights into the operation of the NetAdjust algorithm.
Both theoretical and actual results from field tests will be
presented, highlighting the strengths and limitations of using
a network of reference receivers for precise positioning.
Material
from talk powerpoint
(1.2MB)
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