Three updates from Analytical Graphics, Inc. (AGI) create a suite of commercial off-the-shelf software tools for the GPS space, control, and user segments. Users can model a satellite’s performance (orbital mechanics, maneuvers, and subsystems), antenna capabilities (beam forming and null steering), receiver-tracking performance (complete URE and UEE performance and advanced threat modeling), and the geolocation of space-based and terrestrial transmitters.TK 8 provides product consolidation and full integration of AGI’s 3D visualization. Enhanced capabilities include enterprise sharing of STK data, managing geospatial layers on the 3D globe, and terrain analysis. Navigation Tool Kit (NavTK) has undergone comprehensive validation and modifications and is currently in use at the U.S. Air Force’s Second Space Operations Squadron GPS Operations Center. The Orbit Determination Tool Kit (ODTK) supports high-accuracy operations by processing GPS phase and pseudorange measurements with attitude profiles. This suite enables analysis of individual aspects T 2006 Questex Media Group, Inc.