Article View: sci.electronics
Article #6477Re: GPS Availability
From: John Eaton
Date: Thu, 27 Aug 1992 23:23
Date: Thu, 27 Aug 1992 23:23
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David Lesher (wb8foz@skybridge.SCL.CWRU.Edu) wrote: : Others said : # Nope. Selective Availability (the deliberate pseudorandom "fuzz" introduced : # by the DoD) is very much back in force. Pity. : : : I've never really understood this. What possible difference does : several hundred meters error make to either: : a) an incoming 3 gigaton warhead : ----------------------------- Why are they called Ballistic Missiles rather than guided missiles? Firing a ballistic missile is like shooting a rifle at a 45 degree angle and having the bullet follow a parabolic course to its target. If the bullet is off by an inch at the terminal point it is no big deal. If it is off by an inch when it leaves the barrel then it will miss its target. ICBM's are smarter than bullets but they have to hit a target 1/2 way around the world. If you can't control the error during the initial boost phase then you have to carry extra fuel to make continious corrections. John Eaton !hp-vcd!johne
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!wupost!sdd.hp.com!hp-cv!hp-pcd!hp-vcd!johne From: johne@vcd.hp.com (John Eaton) Subject: Re: GPS Availability Message-ID: <Bto0zD.Mor@vcd.hp.com> Sender: news@vcd.hp.com (News user) Organization: Hewlett-Packard VCD X-Newsreader: Tin 1.1 PL5 References: <1992Aug16.181355.6239@usenet.ins.cwru.edu> Date: Thu, 27 Aug 1992 23:23:36 GMT Lines: 27