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11th September 2010 | 12:13

#18 (permalink)

Mr Optimistic

Joined: Jun 2009

Posts: 1,344

Likes: 80

From: Bedford, UK

think this reference is 'open' to read on internet

Global positioning systems, inertial ... - Google Books

Don't know what limited 'ATTITUDE' mode is but suspect its as stated above. INS senses true north by sensing earth's rotation when platform is at rest: direction of 'g' gives local horizontal. With schuler tuned system transport rate couples error effects to limit divergence.

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