|
|
|
|
|||||
|
||||||
Subject: Re: accuracy of automatic celestial navigation
From: Brian Whatcott (betwys@XXX.XXX)
Date: Mon Dec 09 2002 - 19:07:12 EST
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!
|