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New and Future Models

This research by Matt King from Newcastle University highlights the significant impact of new and future models on tropospheric estimates derived from GPS data. It examines global reprocessing solutions from 1995-2007, analyzing the effects of absolute phase centers, VMF1 improvements, and hydrostatic zenith delays. The study also investigates higher-order ionospheric effects, comparing geomagnetic models and their implications for consistent reprocessing. The results underscore the need for enhanced models to accurately assess the complex interplay between environmental factors and GPS positioning.

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New and Future Models

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  1. New and Future Models Matt King, Newcastle University, UK

  2. New: Effects of New Models on Tropo Estimates • Several consistent global reprocessing solutions (1995-2007)‏ • In turn, examine effect of • Abs Phase Centres • VMF1 • Improved Hydrostatic Zenith Delay • Thomas et al (in prep)‏

  3. Tropo Estimates • Respective models influence is location dependant)‏

  4. Near future: Higher order ionospheric effects • Examine effect of 2nd+3rd order ionosphere on consistent reprocessing (1995-2007, every 2nd day)‏ • Also effect of geomagnetic model (simple dipole vs International Geomagnetic Reference Field)‏ • Petrie et al (in prep), and invited talk at EGU

  5. 2nd and 3rd order iono Transformation to ITRF2005 Effect of modelling terms Difference between dipole and IGRF model Periodogram for dTZ

  6. 2nd and 3rd order 1996-2000 2001-2005 1996-2005

  7. Needed: Improved MP model • Simulation MP model of Elosegui et al (1995) on long time series • Static MP field is sampled by time-variable satellite constellation • Time-variable propagation effect?

  8. Possible MP effect Presuming clear horizon

  9. Possible MP effect

  10. Conclusions • Recent models improve GPS TZD estimates dramatically • Higher Order iono important for global reference frame • MP simulations • Gives feel for likely MP effect at each site • Model too simplistic – e.g., no azimuthal variation, technically only applies in far field • Need advances here to model and mitigate the effect

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