The goal of the GPSTk project is to provide a open source library and suite of applications to the satellite navigation community - to free researchers to focus on research, not lower level coding. The GPSTk suite consists of a core library and a set of applications. The library provides a wide array of functions that solve processing problems associated with GPS such as processing or using standard formats such as RINEX. The library is the basis for the more advanced applications distributed as part of the GPSTk suite. The GPSTk library provides the base functionality for the GPSTk applications and for a number of other independent projects. There are several categories of functions in the GPSTk library: 1. GPS time. Conversion among time representations such as MJD, GPS week and seconds of week, and many others. 2. Ephemeris calculations. Position and clock interpolation for both broadcast and precise ephemerides. 3. Atmospheric delay models. Includes ionosphere and troposphere models. 4. Position solution. Includes an implementation of a Receiver Autonomous Integrity Monitoring algorithm. 5. Mathematics. Includes Matrix and Vector implementations, as well as interpolation and numerical integration. 6. Application framework. Includes processing command lines options, providing interactive help and working with file systems. The GPSTk applications support greater depth of functionality to support research and development. The applications are almost entirely console based (i.e., without a graphical user interface). They can be grouped functionally into a number of categories. 1. Basic transformations. Conversions of time and coordinate systems. 2. Observation data collection and conversion. Translating receiver specific data formats to RINEX. 3. File comparison and validation. Differing observations files against a truth source. 4. Data editing. Systematic removal of observations by satellite, type or time. 5. Ionosphere modeling. Basic models of the ionosphere. 6. Autonomous and relative positioning. Navigation and surveying applications.
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