That sounds reasonable, thanks, Mark. All IN systems have to guess at
their position on the earth before being aligned. They need this to
know what the angular acceleration should be so as to erect the
platform level. Presumably the local gravitational force is part of
the erection and alighnment process.
Just before I left the F16, the platforms were stabilised with ring-
laser gyros. They were fantastic machines!
Chris
On 10 Mar 2009, at 04:11, Mark Marr-Lyon wrote:
> The problem is that there is no way to measure the difference
> between an
> object in a gravitational field of 9.8 m/s^2 and one that is in an
> elevator being accelerated in free space at a rate of 9.8 m/s^2.
> This is
> known as the equivalence principle and is at the heart of general
> relativity. All inertial navigation systems have to have some way to
> subtract the earth's gravitational field in order to give the right
> answer.
--
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