Final Notice on Codeless and
Semi-Codeless Access to GPS
On May 16, 2008, the Office of Space Commercialization published a notice in the Federal Register requesting public comments on the U.S. Government's plan to phase out codeless and semi-codeless access to GPS by December 31, 2020. The government seeks to encourage the users of codeless/semi-codeless technology to migrate to new GPS equipment utilizing the next-generation signals known as L2C and L5. The transition plan will have no effect on users of consumer GPS devices that use the basic civil signal known as C/A on L1.
The comment period closed on June 16, 2008. All comments received have been posted on this page for public viewing. The Office of Space Commercialization reviewed the comments and used them to inform government discussions regarding the transition plan for codeless and semi-codeless GPS access.
On September 23, 2008, the Department of Defense issued a final notice committing to continue supporting codeless/semi-codeless GPS access until December 31, 2020.
On December 28, 2009, Gen. Robert Kehler of Air Force Space Command issued a letter to the civilian community confirming the Air Force's intent to comply with the 2008 Federal Register notice and to document a commitment to phase stability for the new civil GPS signals.
In August 2010, the Air Force followed up by publishing updates to the GPS Interface Specification documentation. Among other things, the new documentation establishes a baseline phase relationship for the L2C signal.
The external links below provide additional information about key U.S. Government programs, organizations, and documents referenced in the Federal Register notice.
- Global Positioning System
- GPS Modernization
- National Executive Committee for Space-Based PNT
- 2001 GPS SPS Performance Standard (no longer in effect)
- 2005 Federal Radionavigation Plan (no longer in effect)
The following articles from the trade press offer additional perspectives on the codeless/semi-codeless transition plan.
- 5/15/2008: PNT Executive Committee Proposes Codeless/Semicodeless Transition Plan (Inside GNSS)
- 6/5/2008: Perspectives -- Early June 2008(GPS World)
- 7/1/2008: Leadership Talks -- Costs of New Tech (GPS World)
- 7/1/2008: Out in Front -- Stewardship, the Concept (GPS World)
- 7/1/2008: Expert Advice -- Civil P(Y) Code (GPS World)
- 11/1/2008: DoD Sets End Date for Codeless, Semi-Codeless GPS Support (POB)
Public Comments ReceivedThe Office of Space Commercialization does not endorse the views of any individual person, company, association, or organization whose comments are provided here.
- 6/6/2008: Jarrod Black, Rochester & Associates, Inc.
- 6/6/2008: Michael W. King, LGA Engineering, Inc.
- 6/6/2008: Dallas Vienneau, Can-Am Geomatics BC
- 6/8/2008: George Castagnola
- 6/9/2008: Kyoko Kotani, Geographical Survey Institute, Japan
- 6/9/2008: Donald W. Rowe, Rowe Surveying & Engineering Co., Inc.
- 6/10/2008: Octavio Leon Caro Cataño, UNE EPM Telecomunicaciones S.A. E.S.P.
- 6/10/2008: James Davis, FreeFlight Systems
- 6/16/2008: Ann Ciganer and Bruce Peetz, Trimble Navigation Ltd.
- 6/16/2008: S. John Waits, Omnistar, Inc.
- 6/18/2008: F. Michael Swiek, U.S. GPS Industry Council