Space Geodesy Data Analysis Software System
DOI: 10.25966/7z5f-eg07
Abstract:
Space geodesy data analysis software suite (SGDASS) is a collection
of software programs with the primary goal of support of analysis of very
long baseline interferometry (VLBI) observations. It consists of
programs for processing raw interferometric visibility data, i.e.
time series of auto- and cross-correlations; processing group
delays and calibrated visibilities for estimation of station position
source coordinates, Earth orientation parameters, as well as user
defined parameters; computation of edited and coherently averaged
visibilities over time- and frequency; analysis of raw results of
parameter estimation and generation data products of VLBI parameter
estimation; scheduling VLBI observations; and the infrastructure for
processing data that are required as a priori for space geodesy data
analysis. That infrastructure consists of programs for computation of
theoretical time delay and Doppler frequency shift for geodetic and
absolve astrometry VLBI observations; computation of slant path delay
through the heterogeneous atmosphere, as well as atmospheric opacity and
atmosphere brightness temperature; computation of crustal deformation
caused by mass loading; computation of the atmospheric angular momentum;
prediction of the Earth orientation parameters; computation of the total
electron contents in the ionosphere using GNSS global ionospheric maps,
a custom database handler, and a suite of general purpose mathematical
procedures. That suite consists of tools routines implementing fast
spherical harmonics transform, matrix inversion, sparse matrix
algebra, expansion into multi-dimensional B-spline transform, various
parameter estimation tools, and general routines for the interface with
UNIX, and a graphic interface.
SGDASS provides a layer of software of a pipeline for analysis of VLBI
data for both research and development purposes and for generation of
data products on a regular basis in a form suitable for scientific
publications and for their dissemination to the scientific community.
SGDASS has dependencies to a number of open source packages. It requires
open source GNU compiler collection for building. SGDASS does not have
dependencies to non-open source codes.
A brief SGDASS description
Availability:
Source code is available at the github repository.
Tarball with Space Geodesy Data Analysis Software System
sgdass-20250130.tar
Installation instructions are here
sgdass-20250130_INSTALL.txt
See file INSTALL inside the tarball for installation instuctions.
License: NASA Open Source Agreement.
Government Agency Original Software Designation: GSC-19327-1.
Approved for public release.
Authors:
Contact:
Questions, unquires, bug reports should be sent to astrogeo@lists.nasa.gov
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Last update: 2025.02.05_14:50:14
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