Interface Control Documents
Updated September 30, 2022
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The communication boundaries between the Global Positioning System and other systems, as well as within the GPS itself, are known as interfaces. Interface Control Documents (ICDs) are the formal means of establishing, defining, and controlling interfaces and for documenting detailed interface design information for the GPS program.
Interface Specifications (ISs) are specific types of ICDs that only need approval from one government office or agency. The procedure and process for development, control, and maintenance is the same for ICDs and ISs.
New ICD Revisions in Development
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8/22/2022: UPREVISIONS RELEASED
The Space Force released uprevisions to IS-GPS-200, IS-GPS-705, and IS-GPS-800 incorporating the IRNs released earlier this year.
View IS uprevisions -
8/5/2022: PCNs RELEASED -- Comments due Sep 19, 2022
The Space Force requests public comments on 3 Proposed Change Notices (PCNs) affecting IS-GPS-200, IS-GPS-705, and IS-GPS-800 ahead of the September ICWG meeting.
Learn more -
7/20/2022: IRNs RELEASED
The Space Force released the final Interface Revision Notices (IRNs) based on RFC-467: 2021 Proposed Revisions to the Public Documents
View IRNs -
7/14/2022: PUBLIC ICWG MEETING ANNOUNCED
The Space Force will hold the 2022 Public Interface Control Working Group and Open Forum as a virtual meeting on September 28.
Learn more
Current ICDs in Effect
View PDF (3.2 MB) 08/22/2022
(Corrected — Do not use version dated 04/18/2022) Defines the requirements related to the interface between the GPS space and user segments for radio frequency link 1 (L1) and link 2 (L2) IS-GPS-705 J
View PDF (1.7 MB) 08/22/2022
(Corrected — Do not use version dated 04/18/2022) Defines the requirements related to the interface between the GPS space and user segments for radio frequency link 5 (L5) IS-GPS-800 J
View PDF (4 MB) 08/22/2022
(Corrected — Do not use version dated 04/18/2022) Defines the characteristics of the L1 Civil (L1C) signal transmitted from GPS satellites to navigation receivers on radio frequency link 1 (L1) ICD-GPS-240 D
View PDF (1.8 MB) 05/21/2021 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 ICD-GPS-870 E
View PDF (1.5 MB) 08/13/2020 Defines the functional data transfer interface between the GPS Next Generation Operational Control System (OCX) and the GPS user and user-support communities; captures the same interface as ICD-GPS-240, but for the OCX era
ICD-GPS-153 & Other ICDs
Memo on ICD Compliance
Historic ICDs
Interface Control Working Group
The Interface Control Working Group (ICWG) is a specialized 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 Space and Missile Systems Center (SMC) of the U.S. Space Force, other government agencies and offices, contractors, and other industry organizations.
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.
Comments received through the ICWG are adjudicated according to the GPS Technical Baseline Configuration Management Process (TBCMP), which includes an Adjudication Working Group (AWG) and Rough Order of Magnitude (ROM) / Impact Assessment (IA).
For additional information about the ICWG, please contact SMCGPER@us.af.mil.
Public ICWG Meetings
- October 2022
- September 2021
- September 2020
- September 2019
- May 2019
- September 2018
- September 2017
- September 2016
- December 2015
- August 2014
- September 2013
- September 2012
- September 2011
- April 2011
- March 2010
- February 2010
- October 5, 2009
- October 1, 2009
- September 2009
- November 19, 2008
- November 18, 2008