US: In a letter to Gen. William L. Shelton, commander of the US Air Force Space Command, the GPS Innovation Alliance expressed support for planned enhancements to the GPS constellation. Specifically, the Alliance supports activating the Civilian Navigation (CNAV) message on two additional GPS signals to ensure a more robust GPS system and infrastructure.
Calling GPS “one of our most critical and valuable national assets,” the Alliance explained that the planned development will serve the public interest by increasing accuracy and reliability of civilian GPS applications by providing more receivers with dual frequencies. “We believe that GPS users will experience benefits from activation of the full CNAV message on the GPS L2C and L5 signals,” the Alliance wrote. “A fully redundant signal capability greatly improves GPS robustness by providing frequency diversity and mitigates deliberate and accidental interference [jamming].”