Modeling environmental loading effects at the observation level in GPS processing
July 7, 2017 • 453 Views
Workshop 2017 - Jean-Paul Boy - We model atmospheric, induced oceanic and hydrological loading effects at the observation level in the processing of a global GPS network, and show how it helps reducing the high frequency and the annual variabilities of both horizontal and vertical components of the retrieved GPS position. We pay a special attention to the modeling of the oceanic response to atmospheric pressure, comparing the classical inverted barometer assumption with the barotropic ocean model TUGO-m forced by pressure and winds. We also investigate carefully the effects of the forward modeling of environmental loading on the long-term trends in the GPS positioning, compared to the a posteriori correction.