Basic framework: gamit GAMIT: Series of programs that process GPS hase data · Parameters estimated Station positions Satellite orbits parameters Initial conditions Radiation parameters Earth orientation parameters(EOP) Atmospheric delay parameters Time dependent Zenith delays and gradients Carrier phase ambiguities Basic framework: GLOBK GLOBK: Uses parameter estimates and full covariance matrices from different sources to combine results Inputs from gPs, sLr, VLbI and sineX files Used to estimate quantities such as Site velocities from series of measurements Satellite orbit improvement EOP parameter Other derived parameters04/30/03 12.540 Lec 20 9 – Station positions – Satellite orbits parameters • Initial conditions • • Phase center offsets – Earth orientation parameters (EOP) – Atmospheric delay parameters • Time dependent Zenith delays and gradients – Basic framework: GAMIT • GAMIT: Series of programs that process GPS phase data • Parameters estimated: Radiation parameters Carrier phase ambiguities 04/30/03 12.540 Lec 20 10 Basic framework: GLOBK – Site velocities from series of measurements – Satellite orbit improvement – EOP parameters – Other derived parameters • GLOBK: Uses parameter estimates and full covariance matrices from different sources to combine results • Inputs from GPS, SLR, VLBI and SINEX files • Used to estimate quantities such as: 5