Spherical Harmonics as a Supplement to Global Tropospheric Mapping Functions and Horizontal Gradients

Details Spherical Harmonics as a Supplement to Global Tropospheric Mapping Functions and Horizontal Gradients Spherical Harmonics as a Supplement to Global Tropospheric Mapping Functions and Horizontal Gradients

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001evga.conf..143b&link_type=abstract

Proceedings of the 15th Workshop Meeting on European VLBI for Geodesy and Astrometry. Institut d'Estudis Espacials de Catalunya,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Global mapping functions are used to map the tropospheric zenith path delays down to the path delays at certain elevations. Recently, horizontal tropospheric gradients have also been applied to account for azimuthal asymmetries of the path delays. Anyway, there are still deficiencies when combining the elevation-dependent mapping functions and horizontal gradients to model the tropospheric path delays. Spherical Harmonics to describe those deficiencies are tested by solving for the respective coefficients. Tests show that some combinations of Spherical Harmonics yield slightly better results than applying the standard approach of global mapping function plus gradient.

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