The improvement of GPS-derived PWV accuracies using solid earth tide models based on local measurements
Abstract
We investigate the influence of contemporary solid earth tide models in particular the IERS2003 model on the integrated precipitable water vapour PWV obtained from the South African permanent networks of dual-frequency Global Positioning System GPS receivers One of the International GNSS Service IGS stations analysed SUTH located at the South African Astronomical Observatory Sutherland is collocated with a superconducting gravimeter from which vertical earth tide displacement data are obtained for comparisons with the IERS2003 model and GPS measurements It is illustrated that the global earth tide model over-estimates the crust s local vertical displacement It is further shown that the model errors will contribute to significant errors in the consequently derived PWV Finally a number of strategies including a novel method for measuring earth-tide with GPS are presented to improve solid earth tide modelling during GPS processing
- Publication:
-
36th COSPAR Scientific Assembly
- Pub Date:
- 2006
- Bibcode:
- 2006cosp...36..920C