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= GAMIT/GLOBK = GAMIT/GLOBK is a scientific software package developed by the Massachusetts Institute of Technology, the Harvard-Smithsonian Center for Astrophysics, Scripps Institution of Oceanography and Australian National University for processing and analyzing Global Navigation Satellite Systems (GNSS) data with the high precision. Unlike commercial software for same purposes, GAMIT/GLOBK is able to estimate station coordinates and velocities, stochastic or functional representations of post-seismic deformation, atmospheric delays, satellite orbits, and Earth orientation parameters.

Product history
The orbital integration and modules used in computing the theoretical phase observable have their origins in the Planetary Ephemeris Program (PEP) written at Lincoln Laboratory in the 1960’s. The codes for processing GPS observations were developed at Massachusetts Institute of Technology in the 1980’s. The current form of the GAMIT is a result of collaboration between following institutions: Scripps Institution of Oceanography, Australian National University, University of Canberra, New Mexico Tech, Newcastle University, Ohio State University, University of Tokyo, University of Tasmania. GLOBK was developed by Thomas Herring and Jim Davis at Harvard-Smithsonian Center for Astrophysics for combination of VLBI data and modified at MIT to incorporate GPS data. Funding for the early development of GAMIT was provided by the Air Force Geophysics Laboratory, and for GLOBK by NASA. Current support for development and support of the scientific community comes primarily from the National Science Foundation. The software is currently maintained by Thomas Herring, Robert King, Micheal Floyd at MIT.

People who made contribution in developing GAMIT/GLOBK:


 * Michael Ash, Irwin Shapiro, and Bill Smith (Planetary Ephemeris Program)
 * Bob Reasenberg, John Chandler, Thomas Herring, Robert King, Micheal Floyd (Massachusetts Institute of Technology)
 * Yehuda Bock, Danan Dong, Peng Fang (Scripps Institution of Oceanography)
 * Kurt Feigl, Thomas Herring, Robert King, Simon McClusky, Mike Moore, Paul Tregoning (Australian National University)
 * Peter Morgan (University of Canberra)
 * Mark Murray (New Mexico Tech)
 * Liz Petrie (Newcastle University)
 * Berkhard Schraffin (Ohio State University)
 * Seiichi Shimada (University of Tokyo)
 * Chris Watson (University of Tasmania)
 * Jim Davis (Harvard-Smithsonian Center for Astrophysics)

Components
The module GAMIT, which stands for GPS At MIT, is package of programs which used for analysis of GNSS data. It uses satellite broadcast carrier to process GNSS data to estimate three-dimensional relative positions of ground stations and satellite orbits, atmospheric zenith delays, and Earth orientation parameters (EOP). The GAMIT allows users to perform the following functions: to prepare the data for processing, to generate the information about reference orbit and rotation values for the satellites, to interpolate time and location values of atmospheric models, to compute the residual observations, to detect breaks in the data, and perform a statistical analysis.

The module GLOBK, which stands for Global Kalman filter, is a Kalman filter for combining solutions from the processing of various geodetic data such as GNSS, VLBI (Very-long Baseline Interferometry), and SLR (Satellite Laser Ranging) observations. The GLOBK accepts various satellite data to estimate covariance matrices for station coordinates, earth-orientation parameters, orbital parameters, and source positions generated from the analysis of the primary observations.

Operating systems
GAMIT/GLOBKT uses C-shell scripts to control processing which invoke the Fortran or C programs compiled. The software is designed to run under any Unix operating system supporting X-Windows, including Linux and MacOS.

In addition to a basic UNIX- or Linux-based operating system, there are three fundamental requirements for installing GAMIT/GLOBK on any system:


 * a Fortran compiler
 * a C compiler
 * X11 libraries and headers

License
For any commercial purposes a user must receive a license from the MIT. The software may be obtained without written agreement or royalty fee by universities and government agencies for any non-commercial purposes.

Competitors
There are two more such scientific software which is able to implement same functions as GAMIT/GLOBK: Bernese GNSS Software (University of Bern, Switzerland) and GIPSY-OASIS (California Institute of Technology, CA).