Improved atmospheric mapping functions for VLBI and GPS
By A. Niell. 2000
153 citations recorded by the source corpus.
New mapping functions based on in situ meteorological parameters have been developed for calculating the radio path length through the atmosphere at elevations down to 3°. The hydrostatic component of the mapping function is related to the geopotential height of the 200 mb isobaric pressure level above the site and provides a factor of two improvement in accuracy and precision over previous hydrostatic mapping functions at mid-latitudes. The wet component of the mapping function is calculated from the vertical profile of wet refractivity at the site but will provide an improvement of only about twenty-five percent. However, since the effect of known errors in the hydrostatic mapping function dominates that from the wet component, except near the equator, implementation of these mapping functions should reduce the contribution of the atmosphere to errors in estimates by VLBI and GPS of both the vertical component of site position and the radio propagation delay due to water vapor in the atmosphere.
Subfields: Aerospace Engineering, Astronomy and Astrophysics, Oceanography
View Paper: https://www.semanticscholar.org/paper/5d30ca49335069e34b78eb4ce14ba27c48584379
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In Aerospace Engineering
- Harald Schuh
- Johannes Boehm
- Maorong Ge
- Markus Rothacher
- G. Gendt
- Birgit Werl
- R. Schmid
- Peter Steigenberger
In Astronomy and Astrophysics
- Harald Schuh
- Johannes Boehm
- Birgit Werl
- R. Schmid
- Maorong Ge
- Peter Steigenberger
- Markus Rothacher
- G. Gendt
In Oceanography
- Harald Schuh
- Johannes Boehm
- Maorong Ge
- Markus Rothacher
- G. Gendt
- Birgit Werl
- R. Schmid
- Peter Steigenberger
Citations in the corpus
- Generation of a consistent absolute phase-center correction model for GPS receiver and satellite antennas (2007, methodology): “…by Berg (1948) with a reference pressure of 1013.25 hPa at the ellipsoidal reference height of 0 m; mapped to the zenith with the hydrostatic isobaric Niell (2000) mapping function computed from NCEP (National Centers for Environmental Prediction) z200 data (height of the 200 hPa pressure…”
- Troposphere mapping functions for GPS and very long baseline interferometry from European Centre for Medium‐Range Weather Forecasts operational analysis data (2006, methodology): “[28] The mapping functions NMF [Niell ,1 996], IMF [ Niell, 2000 ], and VMF [Boehm and Schuh, 2004] apply parameters for the b and c coefficients of the continued fraction form (equation (2)) that are symmetric with regard to the equator (apart from the phase offset for the two hemispheres with NMF)”