On Fri, 25 Jul 2003 00:01:39 -0400, you wrote:

>> My understanding is that horizon sensors simply look for some
>> line where the IR (or maybe even visible light) radiation changes
>> abruptly and consider this as the horizon. I could be wrong on this =
one,
>> though, too.

Nope - your right, that is how the FMA Co-pilot works, it helped me
doing some Cof G design work on a particularly twitchy flying wing.
Used once and been in the box ever since, but it was worth it not to
destroy 100hrs+ of building time!

>The ones like the FMA Co-Pilot are even simpler. For each axis there
>are two sensors pointed in opposite directions. It just looks to see
>which is picking up more light; if they are the same it's level.

No - IR not visible light.
--
Steve Blackmore

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