A real-time meteorological-based troposphere (RMT) correction with integrity bound for long baseline DGPS |
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Authors: | Yujie Zhang Chris G Bartone |
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Institution: | (1) Avionics Engineering Center, Ohio University, 234H Stocker Center, Athens, OH 45701-2979, USA;(2) School of Electrical Engineering and Computer Science, Ohio University, 351 Stocker Center, Athens, OH 45701-2979, USA |
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Abstract: | This paper concentrates on the analysis of a real-time meteorological (MET)-based troposphere (RMT) model where MET data are
used in real-time to provide troposphere error corrections with a bounded level of integrity for a prototype National Differential
Global Positioning System-High Performance (NDGPS-HP) architecture. Toward this goal, three aspects are studied for this approach:
sensitivity analysis, accuracy assessment, and integrity analysis. A Hopfield zenith delay and Chao mapping function models
were chosen as a good compromise between accuracy and complexity in the integrity analysis. The sensitivity analysis results
indicate that the Hopfield model is mostly sensitive to hot humid conditions, which is compounded slightly more and where
some relative humidity sensors are less accurate. The accuracy assessment was performed with respect to both absolute and
relative accuracy. In the absolute accuracy assessment, the comparison was made in terms of zenith troposphere delay estimation
error, with respect to the International GPS Service (IGS) final troposphere zenith path delay (ZPD) product, which was used
as the true ZPD. For locations where IGS stations are not available, a relative accuracy assessment was performed whereby
comparisons were made in terms of GPS double difference (DD) carrier-phase troposphere correction residuals using various
techniques. The accuracy assessment results indicate that the RMT has insignificant differences from the prototype National
Oceanic and Atmosphere Administration (NOAA) troposphere error forecast model. An integrity analysis was performed, which
presents integrity bounds for the RMT that can be applied to a NDGPS-HP architecture in which integrity requirements exist.
The overriding goal of this effort was to establish a preliminary real-time troposphere error estimation model, with defined
levels of integrity in its troposphere error estimation that can be included in an NDGPS-HP architecture, where integrity
is a key system requirement. The conclusion is drawn that the RMT model may be well suited for a variety of users within a
NDGPS-HP architecture.
An erratum to this article can be found at |
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