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    Re: accuracy of automatic celestial navigation
    From: Brian Whatcott
    Date: 2002 Dec 9, 18:07 -0600

    It's encouraging to see a post like Paul's.
      Knowledgable, steady, helpful....
    
    Brian W
    
    At 01:42 PM 12/9/02, Paul Hirose, you wrote:
    >...
    >An INS can handle motion far more violent than a seagoing vessel will
    >experience. ...
    
    > > In the days before GPS, how could the instaneous position in flight be
    > > independently determined sufficiently accurately, for testing purposes? ...
    
    >A tracking instrument on the ground called a cinetheodolite is the
    >old-tech method.
    
    >http://www.serve.com/mahood/nellis/ttr/sln5.htm
    >
    >http://www.emitechnologies.com/optped.html
    >
    >http://www.acq.osd.mil/te/mrtfb/commercial/afftc/time.html
    >
    >
    >The 1984 Bowditch explains this better than I can:
    >
    >"Since an accelerometer cannot distinguish between a kinematic
    >acceleration and a gravitational acceleration, any uncertainty in the
    >gravitational environment manifests itself as a system error....
    
    Brian Whatcott
       Altus OK                      Eureka!
    
    
    

       
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