NDLI: Mitigating tropospheric propagation delay errors in precise airborne GPS navigation

Content Provider	IEEE Xplore Digital Library
Author	Collins, J.P. Langley, R.B.
Copyright Year	1996
Description	Author affiliation: Geodetic Res. Lab., New Brunswick Univ., Fredericton, NB, Canada (Collins, J.P.; Langley, R.B.)
Abstract	The high spatial and temporal variability of the troposphere is well known, as is its effect-through propagation delays-on GPS positioning. This effect can be particularly problematical in airborne kinematic differential positioning where the altitude difference between reference station and aircraft is typically quite large. The use of zenith delay models and mapping functions at ground stations is fairly well understood, however their use for processing data collected on board aircraft is less well understood. Previous tests have indicated that some of the models often used for navigation purposes (e.g. Altshuler, NATO and the proposed WAAS model) perform poorly compared to those generally used for static positioning. These tests were not done under kinematic conditions however, but as comparisons with ray tracing through radiosonde data. This paper outlines the work recently done at UNB on testing the reliability of tropospheric models in precise airborne GPS navigation. Particular attention has been paid to the performance of the currently proposed WAAS model. The data used to test the models is from an adverse weather flight dynamics experiment undertaken off Newfoundland, Canada, in March 1995. The paper includes an analysis of the GPS flight data to determine the influence of different tropospheric models on the reliability and accuracy of the solutions.
Starting Page	582
Ending Page	589
File Size	816178
Page Count	8
File Format	PDF
ISBN	0780330854
DOI	10.1109/PLANS.1996.509131
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-04-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Propagation delay Testing Global Positioning System Aircraft navigation Kinematics Radio navigation Terrestrial atmosphere Delay effects Satellite ground stations Ray tracing
Content Type	Text
Resource Type	Article

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