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Acta Geodynamica et Geomaterialia

 
Title: G-NUT SOFTWARE LIBRARY - STATE OF DEVELOPMENT AND FIRST RESULTS
 
Authors: Václavovic Pavel, Douša Jan and Györi Gabriel
 
DOI: 10.13168/AGG.2013.0042
 
Journal: Acta Geodynamica et Geomaterialia, Vol. 10, No. 4 (172), Prague 2013
 
Full Text: PDF file (1.1 MB)
 
Keywords: GNSS, Precise Point Positioning, coordinates, tropospheric path delays, G-Nut, C++ development library
 
Abstract: A Global Navigation Satellite System (GNSS) software library called G-Nut has been developed at the Geodetic Observatory Pecný (GOP) since 2011. Several applications built of the library will be provided as an open source in 2013 and consequently users are able to modify source code and use it for processing their own data free of charge. The main purpose of the project is to create a programming package suitable for implementing various end-user applications such as kinematic position estimation, long-term permanent station coordinates monitoring, zenith tropospheric delay estimation, satellite clock estimation and others. The library is written in C++ programming language following the object-oriented concept. Basic class structure implementing inputs/outputs and product/data containers support both real-time and post-processing modes. Integration of all available global navigation satellite systems (GPS, GLONASS, Galileo, BeiDou, QZSS) as well as new tracking signals is properly handled. The configuration is governed through the XML format. The estimation model currently supports the least square adjustment, the Kalman and square root covariance filtering methods based on processing undifferenced data and fixed precise orbit and clock products. The estimated state vector includes receiver coordinates and clocks, troposphere zenith path delays and initial carrier phase ambiguities. The first applications based on G-Nut library are shown with examples for off-line/online kinematic/static precise point positioning and ultra-fast troposphere estimation.