Raytheon makes progress on next generation GPS OCX for ten times the accuracy against atmospheric conditions | NextBigFuture.com
GPS Next-Generation Operational Control System | Raytheon Intelligence & Space
Global Positioning System: Updated Schedule Assessment Could Help Decision Makers Address Likely Delays Related to New Ground Control System | U.S. GAO
GPS OCX system: A new technology discovers what it is and its benefits
Il Nuovo Sistema di Controllo Operativo GPS Satellitare OCX | Elettronica Open Source