GPS World, August 2012

THE ALMANAC GNSS Satellite and System Information United States and Canada Canadian Space Geodesy Forum http gge unb ca Resources CANSPACE html This University of New Brunswick service presents daily GPS constellation status reports ionospheric disturbance warnings and news and discussion about GPS and other spacebased positioning systems by way of electronic mail Downloadable files are also available To subscribe e mail the one line message sub CANSPACE your_ name to listserv@ UNB CA For more information Terry Arsenault or Richard Langley phone 506 453 4698 fax 506 453 4943 e mail se@ unb ca National Executive Committee EXCOM for Space Based Positioning Navigation Timing PNT www pnt gov The EXCOM advises senior national government leadership and coordinates with federal agencies about policy matters concerning GPS its augmentations and related systems The deputy secretaries of Defense and Transportation jointly chair the EXCOM Executive Committee membership includes equivalent level officials from NASA the departments of State Commerce Homeland Security Agriculture Interior and the Joint Chiefs of Staff Components of the Executive Office of the President and other selected agencies participate as observers The National Coordination Office an interagency staff directed by a member of the Senior Executive Service in Washington provides day to day administrative and operational support to the EXCOM The National Space Based PNT Advisory Board operates in an independent advisory capacity for the EXCOM as directed by the National PNT Policy and in accordance with the Federal Advisory Committee Act For information contact National Coordination Office for Space Based PNT Herbert C Hoover Building Rm 2518 1401 Constitution Ave NW Washington D C 20230 phone 202 482 5809 fax 202 482 4429 e mail pnt office@ pnt gov National Geospatial Intelligence Agency NGA Precise GPS Orbit Information and Earth Orientation Parameter Predictions EOPP http earth info nga mil GandG sathtml Anonymous FTP Access ftp ftp nga mil pub2 gps pedata ftp ftp nga mil pub2 gps apcpe ftp ftp nga mil pub2 gps predictions 9DayGPSpreds ftp ftp nga mil pub2 gps predictions Rapids The NGA Global Positioning System Division Ephemeris Support and Analysis Team maintains a World Wide Web page for Department of Defense and civilian users with precise GPS orbit and clock information based on tracking data collected from NGA U S Air Force and IGS stations Daily and weekly precise ephemeris and clock estimate data both center of mass pedata and antenna phase center apcpe are calculated on a 15 minute interval Approximately two years of data are kept at this site with previous data available on request NGA also offers a nine day orbit prediction ephemeris along with a daily orbit and clock rapid ephemeris also calculated on a 15 minute interval Earth Orientation Parameter Predictions based on data provided by the U S Naval Observatory are provided EOP coefficients and predictions used by the Air Force GPS Operational Control Segment are calculated each Thursday to go into effect the following Sunday through Saturday each new GPS week Daily EOPs are computed for testing and evaluation to be used in GPS III For more information Duty hours 6 a m 6 p m Mon Fri 314 676 9142 or DSN 846 9142 e mail gps@ nga mil 24 hour contact 314 676 9140 or DSN 846 9140 Natural Resources Canada Geodetic Survey Division GPS Data GPS Orbits GPS Clocks and Online Positioning www geod nrcan gc ca Natural Resources Canada Geodetic Survey Division operates the Canadian Active Control System CACS a national network of continuously operating GPS tracking stations Products derived from CACS include GPS observation data precise GPS orbits and precise GPS clock corrections The system supports the positioning requirements of a broad range of users including the most demanding post mission scientific applications providing coordinates in either the Canadian Spatial Reference System CSRS or the International Terrestrial Reference Frame ITRF An online Precise Point Positioning CSRS PPP service allows GPS users from around the world to recover accurate positions from a single GPS receiver by submitting their RINEX observation data via the Internet Information about access to CACS data availability and other geodetic products is available 24 hours a day from a free online subscription service CSRS Online Database For more information Contact our Information Management and Client Services unit 615 Booth Street Ottawa Ontario Canada K1A 0E9 phone 613 995 4410 fax 613 995 3215 e mail information@ geod nrcan gc ca U S Coast Guard Navigation Center Navigation Information Service NIS www navcen uscg gov This site offers GPS constellation status scheduled outage updates user advisories and almanac data as well as Differential GPS and Coast Guard Local Notice to Mariners information Voice recording for GPS constellation status 703 313 5907 For more information Contact the NIS Watchstander 24 hours a day at phone 703 313 5900 fax 703 313 5920 or e mail tis pfnisws@ uscg mil Scripps Orbit and Permanent Array Center SOPAC GPS Orbits Coordinate Information and Data Archive http sopac ucsd edu http csrc ucsd edu http sopac ucsd edu projects realtime The Scripps Institution of Oceanography University of California San Diego maintains SOPAC which provides precise rapid ultrarapid and hourly orbits for the International GNSS Service IGS and NOAAs Global Systems Division GSD Many GPS related services and tools are available from SOPACs website such as SCOUT a global ITRF Coordi nates Generator Site Information Manager SIM On line Map Interface SOMI and GPS Explorer SOPAC archives 24 hour RINEX data from about 1500 continuous GPS sites from more than 20 scientific networks around the world with a concentration in western North America SOPAC also maintains the operational center for the California Spatial Reference Center or CSRC The CSRC provides Californias geodetic framework for scientific engineering and geographical information systems in partnership with the National Geodetic Survey SOPAC also collects and archives high rate 1 Hz low latency 1 second GPS data from stations in California For information about access to real time data streams visit http sopac ucsd edu projects realtime For more information Contact SOPAC Scripps Institution of Oceanography UCSD IGPP 0225 9500 Gilman Drive La Jolla CA 92093 0225 USA call 858 822 2156 fax 858 534 9873 or e mail archive@ gpsmail ucsd edu or Director Yehuda Bock ybock@ ucsd edu DoD GPS Operations Center and 2SOPS Constellation Status https gps afspc af mil gpsoc https gps afspc af mil gps The U S Department of Defense DoD GPS Operations Center and the 2nd Space Operations Squadron 2SOPS U S Air Force maintain Internet sites for military and DoD users only civilians are referred to the U S Coast Guards Navigation Information Service see above The GPS Operations Center provides DOP predictions GPS performance assessments anomaly impact analysis GPS FAQs and other services to meet the needs of GPS users in the field 2SOPS operates a GPS Constellation Status site with scheduled outages user advisories almanac data electronic mail and downloadable files For more information Questions and anomaly reports from civilians and industry contact GPS World August 2012 www gpsworld com 48