Interface Control Documents

The communication boundaries between the Global Positioning System and other systems, as well as within the GPS itself, are known as interfaces.

Interfaces are documented in Interface Control Documents (ICDs). ICDs are the formal means of establishing, defining, and controlling interfaces and for documenting detailed interface design definition for the GPS program.

Interface Specifications (ISs) are specific types of ICDs. ISs specify a single government office or agency as the only necessary and required approval authority for the document. However, the procedure and the process for development, control, and maintenance is the same for both ICDs and ISs.

If you are seeking an ICD that does not appear on this page, or have other ICD-related questions, please contact the GPS Directorate at SMCGPER@us.af.mil.

Air Force Memo on GPS Control Segment Software Change
(IODC Value Selection Process and IS-GPS-200H Compliance)

IS-GPS-200

Updated Jul 2018

Interface Specification IS-GPS-200 defines the requirements related to the interface between the GPS space and user segments for radio frequency link 1 (L1) and link 2 (L2).

PDF icon IS-GPS-200J
Download 3.1 MB

Revision J (IS-GPS-200J), signed May 22, 2018, replaces all prior versions for new design. It incorporates Interface Revision Notices (IRNs) 001 through 006 to IS-GPS-200H.

View prior versions

IS-GPS-705

Updated Jul 2018

Interface Specification IS-GPS-705 defines the requirements related to the interface between the GPS space and user segments for radio frequency link 5 (L5).

PDF icon IS-GPS-705E
Download 2 MB

Revision E (IS-GPS-705E), signed May 22, 2018, replaces all prior versions for new design. It incorporates Interface Revision Notices (IRNs) 001 through 005 to IS-GPS-705D.

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IS-GPS-800

Updated Jul 2018

Interface Specification IS-GPS-800 defines the characteristics of a signal transmitted from GPS satellites to navigation receivers on radio frequency link 1 (L1). While multiple GPS signals broadcast at the L1 band, this Interface Specification defines only the signal denoted L1 Civil (L1C).

PDF icon IS-GPS-800E
Download 3.3 MB

Revision E (IS-GPS-800E), signed May 22, 2018, replaces all prior versions for new design. It incorporates Interface Revision Notices (IRNs) 001 through 004 to IS-GPS-800D.

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ICD-GPS-240

Updated Jul 2018

Interface Control Document ICD-GPS-240 defines the functional data transfer interface between the GPS Control Segment (CS) and the GPS user and user-support communities during the Operational Control System (OCS)/Architecture Evolution Plan (AEP) systems era.

PDF icon ICD-GPS-240B
Download 1.8 MB

Revision B (ICD-GPS-240B), signed May 22, 2018, replaces all prior versions for new design. It incorporates Interface Revision Notices (IRNs) 001 through 004 to ICD-GPS-240A.

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ICD-GPS-870

Updated Jul 2018

Interface Control Document ICD-GPS-870 defines the functional data transfer interface between the GPS Next Generation Operational Control System (OCX) and the GPS user and user-support communities. The ICD describes the data files that are transferred in this interface and the means by which they are distributed. ICD-GPS-870 captures the same interface as ICD-GPS-240, but for the OCX era.

PDF icon ICD-GPS-870C
Download 1.9 MB

Revision C (ICD-GPS-870C), signed May 22, 2018, replaces all prior versions for new design. It incorporates Interface Revision Notices (IRNs) 001 through 003 to ICD-GPS-870B.

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Interface Control Working Group

Comments Requested on PIRNs for Discussion at 2018 Public ICWG

The GPS Directorate has released a set of Proposed Interface Revision Notices (PIRNs) for public comment ahead of the next Public ICWG and Open Forum, scheduled for Sep 12, 2018. Comments are due Aug 20, 2018.

Learn more

The Interface Control Working Group (ICWG) is a specialized technical working group comprised of appropriate technical representatives from the interfacing activities and other interested participating organizations.

The ICWG serves as a forum to develop and provide interface requirements, as well as focus on interface detail definition and issues.

ICWG members include representatives from the GPS Directorate of the U.S. Air Force, other government agencies and offices, contractors, and other industry organizations.

The detailed description and requirements of ICWGs are provided in the GPS ICWG Charter.
View charter

ICWGs for documents that are publicly releasable are referred to as Public ICWGs, which are structured the same as the ICWG but with a few additional requirements. The additional requirements include coordinating meetings and documents to the public.

For additional information about the ICWG, please contact SMCGPER@us.af.mil.

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