Abstract
Several hybrid neutral atmosphere delay models have been developed at the University of New Brunswick. In this paper we are presenting UNB3m_pack, a package with subroutines in FORTRAN and corresponding functions in MatLab which provides neutral atmospheric information estimated using the UNB3m model. The main goal of UNB3m is to provide reliable predicted neutral atmosphere delays for users of global navigation satellite systems (GNSS) and other transatmospheric radiometric techniques. Slant neutral atmosphere delays are the main output of the package, however, it can be used to estimate zenith delays, Niell mapping functions values, delay rates, mapping function rates, station pressure, temperature, relative humidity and the mean temperature of water vapor in the atmospheric column. The subroutines work using day of year, latitude, height and elevation angle as input values. The files of the package have a commented section at the beginning, explaining how the subroutines work and what the input and output parameters are. The subroutines are self-contained, i.e., they do not need any auxiliary files. The user has simply to add to his/her software one or more of the available files and call them in the appropriate way.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
COESA (1966) U.S. Standard Atmosphere Supplements, 1966. U.S. Committee on Extension to the Standard Atmosphere. Sponsored by Environmental Science Services Administration, National Aeronautics and Space Administration, United States Air Force and published by the Superintendent of Documents, US Government Printing Office, Washington, DC
Davis JL, Herring TA, Shapiro II, Rogers AEE, Elgered G (1985) Geodesy by radio interferometry: effects of atmospheric modeling errors on estimates of baseline length. Radio Sci 20(6):1593–1607
IERS (2004) IERS Conventions (2003). In: D.D. McCarthy and G. Petit (eds), IERS technical note no. 32, International Earth Rotation and Reference Systems Service, Verlag des Bundesmates für Kartographie und Geodäsie, Frankfurt am Main
Leandro RF, Santos MC, Langley RB (2006) UNB neutral atmosphere models: development and performance. Proceedings of ION NTM 2006, the 2006 National Technical Meeting of The Institute of Navigation, pp 564–573, Monterey, 18–20 January 2006
Niell AE (1996) Global mapping functions for the atmosphere delay at radio wavelengths. J Geophys Res 101(B2):3227–3246
Acknowledgments
This work was funded by the GEOIDE (Geomatics for Informed Decisions) Network of Centres of Excellence and the Natural Sciences and Engineering Research Council of Canada. The authors also acknowledge financial support provided by the Canadian International Development Agency.
Author information
Authors and Affiliations
Corresponding author
Additional information
The GPS Tool Box is a column dedicated to highlighting algorithms and source code utilized by GPS engineers and scientists. If you have an interesting program or software package you would like to share with our readers, please pass it along; e-mail it to us at gps-toolbox@ngs.noaa.gov. To comment on any of the source code discussed here, or to download source code, visit our website at http://www.ngs.noaa.gov/gps-toolbox. This column is edited by Stephen Hilla, National Geodetic Survey, NOAA, Silver Spring, Maryland, and Mike Craymer, Geodetic Survey Division, Natural Resources Canada, Ottawa, Ontario, Canada.
Rights and permissions
About this article
Cite this article
Leandro, R.F., Langley, R.B. & Santos, M.C. UNB3m_pack: a neutral atmosphere delay package for radiometric space techniques. GPS Solut 12, 65–70 (2008). https://doi.org/10.1007/s10291-007-0077-5
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10291-007-0077-5