Official U.S. Government information about theCodeless/Semi-Codeless GPS Access Commitments
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These documents describe U.S. government commitments to support codeless/semi-codeless civilian access to the current P(Y) signals and the transition to the modernized L2C and L5 signals.
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Federal Register Notice: Preservation of Continuity for Semi-Codeless GPS Applications
This public notice from September 2008 commits the U.S. government to supporting codeless/semi-codeless access to the GPS P(Y) signals until December 31, 2020. Users of codeless/semi-codeless GPS receivers are advised to transition to new user equipment utilizing the modernized GPS signals (L2C, L5). View notice...
Additional background information about the Federal Register notice is available at space.commerce.gov. Go there...
Return to top of pagePublic Letter from Air Force Space Command
In December 2009, General C. Robert Kehler, Commander, Air Force Space Command, in a letter addressed to the Honorable James R. Schlesinger, confirmed 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. View letter...
IS-GPS-200E
This Interface Specification defines the GPS signals that are currently used for codeless/semi-codeless GPS access. It also defines the L2C signal designed to supplant the future need for legacy codeless/semi-codeless techniques. Revision E of the document, dated June 8, 2010, includes new language establishing a baseline phase relationship for the L2C signal. This link leads to the IS-GPS-200 section of the Interface Control Documents page. Go there...
