Unclassified Unclassified - GPS.gov

1 SCOPE
1.1 Scope
This Interface Control Document (ICD) defines the functional data transfer interface
between the Next Generation Global Positioning System (GPS) Operational Control
Segment (OCX) and the GPS user and user-support communities. This ICD describes
the data files that are transferred in this interface and the means by which these data
files are distributed.
The files that are distributed by the GPS OCX are: Almanacs (SEM, YUMA, and
Extended Signals Health Status (ESHS))SEM and YUMA), Operational Advisories
(OAs), Anti-Spoofing (A-S) status, and Notice Advisory to Navstar Users (NANUs). The
format of these files are defined in the Appendices of this document. All data
transferred as described in this ICD is unclassified.
The GPS OCX is operated by the 2 nd Satellite Operations Squadron (2 SOPS),
administratively organized under 50 th Space Wing (50 SW). The GPS user and usersupport
communities are comprised of the Department of Homeland Security (DHS)
United States Coast Guard (USCG) Navigation Center (NAVCEN),; Department of
Transportation (DOT), Federal Aviation Administration (FAA), ); other Civil users; and
various Military GPS users. The interfaces between the GPS OCX and the
NAVCENUSCG, FAA, other Civil users, and the GPS OCX and the Military GPS user
community are implemented using electronic mail (e-mail), iInternet and
SIPRNETSIPRNet. This ICD does not include detailed technical descriptions of the e-
mail system, iInternet or SIPRNETSIPRNet.
1.2 Key Events
The major milestone for implementation of this interface is the initial operating capability
of the GPS OCX system beginning with Effectivity 10 as defined in SS-CS-800.
1.3 Interface Control Document Approval and Changes
The Interface Control Contractor (ICC), designated by the government, is responsible
for the basic preparation, approval, distribution, and retention of the ICD in accordance
with the Interface Control Working Group (ICWG) charter GP-03-001.
The following signatories must approve this ICD to make it effective.
1. Air Force Space Command (AFSPC), GPS Wing Directorate (GPSW) Space
and Missile Systems Center (SMC)
2. Department of Homeland Security (DHS), United States Coast Guard
(USCG), Navigation Center (NAVCEN)
3. Air Force Space Command (AFSPC), 50 th Space Wing (50 SW)
1
ICD-GPS-870
23 June 201113 Aug
2010