Codeless/Semi-Codeless GPS Access Commitments

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 Sep 2008 commits the U.S. government to supporting codeless/semi-codeless access to the GPS P(Y) signals until Dec 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

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Public Letter from Air Force Space Command

In Dec 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
(250 KB PDF)

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IS-GPS-200E

This Interface Specification defines the GPS signals 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 Jun 8, 2010, and all subsequent editions include 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

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