GPS Adjacent Band Compatibility Assessment Workshop

Federal Register

September 29, 2014, The U.S. Department of Transportation recently hosted a workshop to discuss implementation of a Global Positioning System (GPS) Adjacent Band Compatibility Assessment on September 18, 2014 at the U.S. Department of Transportation, John A. Volpe National Transportation Systems Center.

Discussion at this workshop focused on the various implementation steps of the GPS Adjacent Band Compatibility Assessment, including development of GPS receiver use cases, identification of representative GPS receivers, and development of a test and analysis program More.

Presentations from the Workshop: Meeting Agenda

Reference: DOT GPS Adjacent-Band Compatibility Assessment Plan


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The implementation will take place in two phases. First, on April 28, 2014, the initial broadcast of CNAV message-populated L2C and L5 signals will occur at a reduced data accuracy and update frequency compared to the legacy GPS signals in wide use today. Second, in December 2014, CNAV data updates will increase to a daily rate, bringing L2C and L5 signal-in-space accuracy on par with the legacy signals. However, derived position accuracy cannot be guaranteed during the pre-operational deployment of the frequencies.

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