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    Re: Fix by Lunar Distances... for missiles in 1950
    From: Robert Eno
    Date: 2006 Nov 28, 01:17 -0500

    I would be very surprised if you could not locate a PDF version from ION.
    Surely they must have digitized their journal by now?
    or try
    As for riding the nose cone of an ICBM, would that be suicide by sextant?
    ----- Original Message -----
    From: "Frank Reed" 
    To: "NavList" 
    Sent: Tuesday, November 28, 2006 1:01 AM
    Subject: [NavList 1769] Fix by Lunar Distances... for missiles in 1950
    > Here's an article from 1950 that sounds like it probably describes, in
    > principle, the same method of "fix by lunar distances" that I've been
    > talking about but for an entirely different "practical" application:
    > written by J.S. Thompson, Rand Corporation
    > "Abstract : In considering the problem of the automatic navigation of
    > long-range surface-to-surface missiles it soon becomes evident that the
    > system must be 'unjammable' by the enemy. That is to say, the missile
    > cannot be required to depend on information received on radio channels
    > (of any frequency) to keep on course. Such methods can be easily
    > confused by the enemy's broadcasting spurious signals. A system not
    > subject to such maltreatment that would measure the change in the
    > position of the moon relative to the stars due to the motion of the
    > observer (the missile, in this instance) over the surface of the earth
    > is proposed. The elements which such a system could have are
    > described."
    > What I can't figure out is how do you get volunteers with sextants to
    > ride along in the nosecones of the guided missiles? Also, considering
    > it would take 45 minutes to work up such a position using the
    > technology available in 1950, wouldn't it be just a bit too late for a
    > guided missile? Ah well, maybe the "elements which such a system could
    > have" included digital cameras and microcomputers. 
    > And fans of semi-academic journals will be happy to know that
    > Thompson's article was apparently published in the Sep/Dec 1951 issue
    > of "Navigation", the journal of the Institute of Navigation. I haven't
    > been able to find a library that has old issues. Anyone?
    > -FER
    > >
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