Re: gps etc
- From: fairwater@xxxxxxxxx (Derek Lyons)
- Date: Wed, 27 Sep 2006 07:59:24 GMT
"Brian Gaff" <Briang1@xxxxxxxxxxxxxxxx> wrote:
I noted when Atlantis came back, they included gps data into the mix, I
understand this is going to happen more and more soon.What I have never
really grasped about gps is how height information is obtained though.
The same way position is determined - by spherical triangulation.
GPS height calculations are however notoriously flawed. The system was
originally designed to support SSBN's, and when it was adapted to
wider [military] use this was not seen as a flaw. (I.E. no military
user particularly cares for precise height.) It wasn't until they
started using for weapons and proposing it [civil] aircraft guidance
that it became a problem.
I don't know offhand how the shuttle copes with this flaw.
D.
--
Touch-twice life. Eat. Drink. Laugh.
-Resolved: To be more temperate in my postings.
Oct 5th, 2004 JDL
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