Re: gps etc
- From: "Danny Dot" <don't.mail.me@xxxxxx>
- Date: Thu, 28 Sep 2006 17:27:21 GMT
"Jorge R. Frank" <jrfrank@xxxxxxxxxxx> wrote in message
news:Xns984C237F14A3jrfrank@xxxxxxxxxxxxxxxxx
fairwater@xxxxxxxxx (Derek Lyons) wrote in news:451a2e55.932635078
@news.supernews.com:
On STS-115, the GPS data looked very good, so the ground never called for
the crew to take air data to NAV. They did call for air data to G&C, and
continued to monitor the air data residuals to make sure GPS was behaving.
It has been a while since I tought air data, but if I remember correctly,
even with a perfect NAV state, you need air data to G&C because wind causes
an error on nav derived air data. Wind can cause a significant error in
angle of attack, dynamic pressure, and mach number estimates.
Danny Dot
www.mobbinggonemad.org
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