Global Positioning Landing System -- Integrates data from
the global navigation satellite system, ground stations and a
multi-mode receiver on the airplane to provide pinpoint accuracy of
the airplane's position relative to the runway and surrounding
terrain.
"The North Koreans have been working on it for a while
without much of a let up ... We think they are speeding
up."
Source: An unidentified DoD official, on what
the US suspects will be an imminent test of North Korea's latest
intercontinental ballistic missile, the two-stage Taepodong 2.
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