Parameterization of tropospheric delay correction for mobile GNSS positioning: a case study of a cold front passage
✍ Scribed by R. Eresmaa; M. Nordman; M. Poutanen; J. Syrjärinne; J. - P. Luntama; H. Järvinen
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 442 KB
- Volume
- 15
- Category
- Article
- ISSN
- 1350-4827
- DOI
- 10.1002/met.86
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✦ Synopsis
Abstract
Numerical weather prediction (NWP) model output can be used for derivation of tropospheric delay correction in order to decrease positioning errors of Global Navigation Satellite System (GNSS) applications. In precise geodetic positioning it is possible to make use of corrections that are derived separately for all GNSS signal paths. Due to the large amounts of data, this approach is considered impractical from real‐time mobile positioning point of view. This article introduces several parameterization schemes that provide a zenith‐ and azimuth‐angle‐dependent description of tropospheric delay correction at a single observation site. These parameterization schemes are compared in a case study of a cold front passage. Inclusion of zenith‐angle dependency in the parameterization, instead of applying a prescribed mapping function, is found to be crucially important for accuracy. Parameterization can be further improved by applying a horizontal delay gradient and by separating the total tropospheric delay into hydrostatic and wet components. It is concluded that any increase of sophistication in the parameterization results in an increased parameterization accuracy. Copyright © 2008 Royal Meteorological Society