Re:The World Economy Runs on GPS. It Needs a Backup Plan
by ohazi on Thursday July 26, 2018 @02:33AM
(#17615457)
Drift is over a given time, not distance. Missiles generally have an very short fly time, even if they're going really far.
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Re:The World Economy Runs on GPS. It Needs a Backup Plan
by azernik on Thursday July 26, 2018 @02:48AM
(#17615521)
Cruise missiles are very different from (quasi-)ballistic or anti-aircraft missiles - they fly at subsonic speeds at low altitudes (usually using a turbojet) to avoid interception. For example, the classic Tomahawk flies at ~900km/h, with the long-range variants having a range of 2500km, giving a maximum flight time on the order of hours, and so a pure INS drift on the order of low hundreds of meters.