Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4568
Title: Calibration of zenith hydrostatic delay model for local GPS applications
Authors: Liu, Y
Iz, HB 
Chen, YQ 
Keywords: Global positioning system
Mathematical models
Radiosondes
Vapors
Water
Calibration
Issue Date: Jan-2000
Publisher: American Geophysical Union
Source: Radio science, Jan.-Feb. 2000, v. 35, no. 1, p. 133-140 How to cite?
Journal: Radio science 
Abstract: Determination of dry zenith delay, DZD, is important for separating wet zenith delay with high accuracy from Global Positioning System (GPS) measurements. The existing models are usually for the calculation of the zenith hydrostatic delay, ZHD. Because the zenith hydrostatic delay includes the contribution of water vapor and is also not accurate enough, the DZD, approximately replaced by ZHD, will induce ~2 cm error into local GPS applications. In this study we calibrate a popular ZHD model, namely, the Saastamoinen model for local GPS meteorology, using radiosonde data. We test the calibrated model by comparing the predicted delays from the calibrated model against the observed delays from radiosonde data that are not included in the calibration solution. The calibrated model shows 20 mm improvement over the uncalibrated model predictions over the same period. A comparison of the DZDs calculated from GPS measurements over a month period with calibrated and uncalibrated ZHD model predictions shows 15 mm average improvement.
URI: http://hdl.handle.net/10397/4568
ISSN: 0048-6604
DOI: 10.1029/1999RS900100
Rights: An edited version of this paper was published by AGU. Copyright 2000 American Geophysical Union. Y. Liu, H. Baki Iz, and Y. Chen (2000), Calibration of zenith hydrostatic delay model for local GPS applications, Radio Science, 35(1), p. 133-140, 10.1029/1999RS900100 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI.
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