Re: U.S. Secretary of Defense Wants to Move Past GPS to MEMS-Based Navigation, PNT Experts Doubtful

From	jimp@specsol.spam.sux.com
Newsgroups	sci.physics
Subject	Re: U.S. Secretary of Defense Wants to Move Past GPS to MEMS-Based Navigation, PNT Experts Doubtful
Date	2015-07-25 17:10 +0000
Organization	A noiseless patient Spider
Message-ID	<phsc8c-531.ln1@mail.specsol.com> (permalink)
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Yousuf Khan <bbbl67@spammenot.yahoo.com> wrote:
> On 25/07/2015 2:41 AM, jimp@specsol.spam.sux.com wrote:
>> Sam Wormley <swormley1@gmail.com> wrote:
>>> U.S. Secretary of Defense Wants to Move Past GPS to MEMS-Based
>>> Navigation, PNT Experts Doubtful
>>
>> The guy and you are technological idiots; all inertial guidance systems
>> require period initialization against an accurate reference ass hole.
>>
>> All inertial navigation systems suffer from integration drift and there
>> is nothing that can be done to eliminate it other than perodic
>> initialization ass hole.
> 
> They do, but they first started out making these navigational systems 
> for use inside nuclear subs, and so they were designed to be accurate to 
> within centimetres of the GPS coordinates, even after travelling 
> underwater for thousands of miles. They do need resyncing, but not as 
> much as the older systems do.
> 
>        Yousuf Khan

Inertial navigation predates GPS.

Inertial navigation was developed for rockets.

Position updates by ships was done by doing a star fix or otherwise
knowing the current position, i.e. in dock.

Inertial navigation has never had cm accuracy.

The accuracy of an inertial guidance system after an hour of operation
on a moving platform is on the order of a kilometer.

The only thing true in your post is that current systems are better
than the original systems.

-- 
Jim Pennino

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Re: U.S. Secretary of Defense Wants to Move Past GPS to MEMS-Based Navigation, PNT Experts Doubtful jimp@specsol.spam.sux.com - 2015-07-25 17:10 +0000
  Re: U.S. Secretary of Defense Wants to Move Past GPS to MEMS-Based Navigation, PNT Experts Doubtful "hanson" <hanson@quick.net> - 2015-07-25 11:41 -0700
  Re: U.S. Secretary of Defense Wants to Move Past GPS to MEMS-Based Navigation, PNT Experts Doubtful Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2015-07-26 01:57 -0400

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