GPS Interface Control Documents

Interfaces between the Global Positioning System and other systems, as well as within the GPSGlobal Positioning System is a navigation satellite system. See also itself, are documented in Interface Control Documents (ICDs) and are available on this web page. 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).