All CGSIC:    The Air Force Space and Missile Systems Center has published minutes for the 2020 Public Interface Control Working Group (PICWG) and Open Public Forum conducted on September 30, 2020 for the following NAVSTAR GPS public documents: IS-GPS-200 (Navigation User Interfaces), IS-GPS-705 (User Segment L5 Interfaces), IS-GPS-800 (User Segment L1C Interface), and ICD-GPS-240 (NAVSTAR GPS Control Segment to User Support Community Interfaces). The purpose of these meetings is to […]

  All CGSIC, Release Date: February 26, 2021 WASHINGTON – The Department of Homeland Security (DHS) Science and Technology Directorate (S&T) announced today it has published the Positioning, Navigation, and Timing (PNT) Integrity Library and Epsilon Algorithm Suite to protect against Global Navigation Satellite System (GNSS) spoofing, or deceiving a Global Positioning System (GPS) device through false signals. These resources advance the design of PNT systems and increase […]

All CGSIC, Lockheed Martin Space has released the GPS-III Satellite antenna phase center data, as well as the group delay and inter-signal correction data for SVN-76 and SVN-77 as measured at the factory.  The information has been posted on the U.S. Coast Guard Navigation Center's website underneath the IIR/IIR-M antenna pattern data files. https://navcen.uscg.gov/?pageName=gpsTechnicalReferences The phase center and inter-signal bias data included in this new release provides […]

 All CGSIC, Lockheed Martin Space has released the GPS-III Satellite phase center and inter-signal bias data for SVN-74 and SVN-75.  The information has been posted on the U.S. Coast Guard Navigation Center's website underneath the IIR/IIR-M antenna pattern data files. https://navcen.uscg.gov/?pageName=gpsTechnicalReferences The phase center and inter-signal bias data included in this new release provides additional information that supplements the antenna gain pattern data previously […]

  All CGSIC, GPS satellite SVN-77 (PRN-14) was set healthy for initial use on 02 December at 0131Z.  SVN-77 is the fourth of a new generation of GPS satellites and the 23rd satellite to broadcast L2C, the second civil GPS signal at 1227.6 MHz.  L2C is not yet designated as "Operational" by the U.S. Space Force.  However, the L2C signal is set to Healthy and users may utilize this signal at their own risk.  SVN-77 is the 16th satellite to begin broadcasting the third civil GPS signal, L5, […]