Improvement of Atmospheric Hydrostatic Delay Correction at Low Elevation Angle

Details Improvement of Atmospheric Hydrostatic Delay Correction at Low Elevation Angle Improvement of Atmospheric Hydrostatic Delay Correction at Low Elevation Angle

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010acasn..51..309l&link_type=abstract

Acta Astronomica Sinica, vol. 51, no.3, p. 309-316

Astronomy and Astrophysics

Astronomy

Atmospheric Effects, Methods: Analytical

Scientific paper

It is a tendency of GPS (Global Positioning System) meteorology to carry out observations at low elevation angle. The correction of high precision atmospheric hydrostatic delay at low elevation angle is a key issue. Three different methods, which calculate atmospheric hydrostatic delay of radio waves propagating from space to a ground-based receiver, are compared. They are: (1) path integration under the assumption of atmospheric spherical symmetry using radiosonde data; (2) the same method as above, but using NCEP (National Centers for Environmental Prediction) reanalysis data; (3) the Niell's hydrostatic mapping function. Compared with the atmospheric hydrostatic delay correction calculated from the 89 radiosonde data of China in 2001, the accuracy of method (2) is about 5 times better than that of method (3) on condition that the elevation angles are less than 5°.

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