GPS World, August 2009
THE ALMANAC GPS Satellite 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 space based 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 and Timing PNT www pnt gov The EXCOM advises senior national government leadership and coordinates federal agencies about policy matters concerning the GPS its augmentations and related systems The deputy secretaries of Defense and Transportation jointly chair the EXCOM Executive Committee membership includes equivalentlevel 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 administrative and operational support 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 more information National Coordination Office for Space Based PNT Herbert C Hoover Building Rm 6822 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 Precise GPS Orbit Information and Earth Orientation Parameter Predictions 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 4DayGPSpreds 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 four 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 www cdgps com The 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 a precise GPS clock The system supports the positioning requirements of a broad range of users including the most demanding post mission scientific applications to real time users requiring meter level accuracies related to the Canadian Spatial Reference System CSRS and International Terrestrial Reference Frames 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 GPS C a GPS correction service supports national real time GPS positioning including the Canada wide Differential GPS CDGPS Service 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 Client Services 615 Booth Street Ottawa Ontario Canada K1A 0E9 phone 613 995 4410 fax 613 995 3215 e mail information@ geod nrcan gc ca or contact Paul Godin information services manager e mail pgodin@ nrcan gc ca U S Coast Guard Navigation Center Navigation Information Service NIS www navcen uscg gov gps www navcenter org Sponsored by the U S Coast Guard Navigation Center this site offers GPS constellation status scheduled outage updates user advisories and almanac data as well as Differential GPS LORAN C and Coast Guard Local Notice to Mariners information Voice recording for GPS constellation status 703 313 5907 Radio broadcasts WWV minutes 14 and 15 and WWVH minutes 43 and 44 25 MHz 5 MHz 10 MHz 15 MHz and 20 MHz last one is WWV only For more information Contact the NIS Watchstander 24 hours a day at phone 703 313 5900 fax 703 313 5920 or e mail tis pf nisws@ uscg mil Scripps Orbit and Permanent Array Center SOPAC GPS Orbits Coordinate Information and Data Archive http sopac ucsd edu ftp archive ftp garner ucsd edu http archive http garner ucsd edu 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 Services and tools available from SOPACs website include 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 The California Spatial Reference Center or CSRC provides Californias geodetic framework for scientific engineering and geographical information systems in partnership with the National Geodetic Survey 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 2nd Space Operations Squadron http gps afspc af mil gps GPS Operations Center http gps afspc af mil gpsoc The 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 the first listing in this Almanac The GPS Operations Center provides DOP GPS World August 2009 www gpsworld com 46
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