Transcript GPS (Braun)
GPS Instrumentation Specification and Performance John J. Braun COSMIC Program University Corporation for Atmospheric Research Boulder, Colorado IHOP_2002 Water Vapor Intercomparison Workshop Outline •GPS Stations Operating for IHOP •Network Operation and Data Collection Percentage •Homestead Site •General Network Statistics •Data Products •Precipitable Water Vapor •Slant Water Vapor •Tomography Solutions IHOP_2002 Water Vapor Intercomparison Workshop GPS Stations In IHOP Region NOAA/FSL and DOT Stations OU/ARM/SuomiNet Stations Special Stations for IHOP 41 Stations Total IHOP_2002 Water Vapor Intercomparison Workshop Acknowledgements CNRS - CNRM/GAME - France (contact: Joel Van Baelen) NOAA Forecast Systems Laboratory (contact: Seth Gutman) University of Oklahoma (contact: Randy Peppler) ARM Program (contact: James Liljegren) NASA/GSFC (contact: Dave Whiteman) IHOP_2002 Water Vapor Intercomparison Workshop Homestead (SA14) Data Collection IHOP_2002 Water Vapor Intercomparison Workshop ARM CF (SG01) Data Collection IHOP_2002 Water Vapor Intercomparison Workshop French Station (BLAC) Data Collection IHOP_2002 Water Vapor Intercomparison Workshop GPS Data Products Data Product Time Resolution Accuracy Location PW 30 Min 1.5 mm Station Specific SW 2 Min ~1.5 mm Station Specific Tomography 15 Min ??? (g/m3) ARM CF Region IHOP_2002 Water Vapor Intercomparison Workshop GPS PW and SW and Descriptions PWV SW SW is the integrated water vapor along single GPS ray paths PWV is the average (estimate) of all SW observations in a cone scaled to zenith Simultaneous observations along 8-12 GPS ray paths GPS and WVR sensed SW and PWV agree to ~1.5 mm rms IHOP_2002 Water Vapor Intercomparison Workshop Precipitable Water Vapor QuickTime™ and a decompressor are needed to see this picture. IHOP_2002 Water Vapor Intercomparison Workshop Slant Water Vapor QuickTime™ and a Microsoft Video 1 decompressor are needed to see this picture. IHOP_2002 Water Vapor Intercomparison Workshop Example of SW During Storm IHOP_2002 Water Vapor Intercomparison Workshop International H20 Project Tomography Solution IHOP_2002 Water Vapor Intercomparison Workshop Conclusions • 41 GPS Stations in IHOP_2002 Region • Homestead station had high percentage of data availability • PW (30 min), SW (2 min), and Tomography Solutions Available • All GPS data are processed. PW data are available at JOSS web site. If someone is interested in SW and/or tomography data, they should contact me directly ([email protected]). IHOP_2002 Water Vapor Intercomparison Workshop