GAMITGLOBK

GAMITGLOBK is a GNSS data-processing software suite used for precise GPS positioning and reference-frame realization, developed at the Massachusetts Institute of Technology (MIT) for crustal deformation studies. The suite comprises two interconnected components: GAMIT and GLOBK.

GAMIT computes carrier-phase solutions from daily GPS data, estimating station coordinates, tropospheric delays, receiver and satellite biases, and ambiguities from double-difference observations. It employs models for the troposphere and antenna phase-center variations and uses precise satellite orbits and clocks. The output is suitable for forming daily solution estimates and time-series analyses, often in combination with external products such as IGS orbit and clock data.

GLOBK provides a global, time-consistent realization by combining daily GAMIT solutions into a single reference-frame solution. It applies network constraints, stochastic weighting, and Kalman-filter–based smoothing to estimate station positions and velocities over time, tying the results to a stable frame such as the International Terrestrial Reference Frame (ITRF). The combined products commonly include SINEX files for reference-frame contributions and time-series of coordinates.

GAMITGLOBK is widely used in geodesy and geophysics for crustal movement studies, earthquake deformation analysis, and plate-motion research. It supports collaboration across networks, integration of external input products, and detailed workflow documentation. While primarily employed in academic and research settings, it remains a canonical tool in GNSS processing for reference-frame realization and deformation monitoring.