2 ms·

Anyone know how long the inertial functions between GNSS fixes (or base station rendezvous)?

• defrost 3y ago
  If you're surveying you ideally want to fix against a base station as often as possible. In calm waters these are pretty good for 30 minutes and more ... but then there's the wonder of post processing as opposed to "best position guess at the time". The secret source here is a multitude of inputs; multi axial inertia, magnetics, modern underwater not-LORAN, pivoting on features in data from frame to frame and smushing these all together in post to create an optimal (for some value of optimal) best {position + orientation} trajectory after "the game". It's "sufficient" to coarsely move about and get coverage and then use everything known (past and future) to sharpen the 'present' position. This is a seperate case to blasting off into the unknown as a missile and having to get position correct on the fly in a single pass and no do overs. The back pedigree here is access to decades of geophysical and photogrammic survey - so an arsenal of tricks of the trade. https://www.advancednavigation.com/inertial-navigation-systems/mems-gnss-ins/ https://www.advancednavigation.com/inertial-navigation-syste... and https://www.advancednavigation.com/tech-articles/ https://www.advancednavigation.com/tech-articles/ is as much as they say in public, they have defence contracts, I have NDA's <shrug>.