Re: Sensors in Motion Launches MEMS-Based Inertial Nav System

From	Poutnik <poutnik4nntp@gmail.com>
Newsgroups	sci.physics, sci.physics.relativity
Subject	Re: Sensors in Motion Launches MEMS-Based Inertial Nav System
Date	2015-08-03 23:00 +0200
Organization	Good company
Message-ID	<mpokm2$2m6$1@dont-email.me> (permalink)
References	(8 earlier) <mpm82k$ub3$1@dont-email.me> <svn29c-2i.ln1@mail.specsol.com> <g94vraliadmh0rv4gml02avf66riutvv43@4ax.com> <mpo6l8$5mq$1@dont-email.me> <1scvra5cp2tqmp55klrrc9m6v8iq3a2sqp@4ax.com>

Cross-posted to 2 groups.

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Dne 03/08/2015 v 20:52 Jackpol11@hotmail.com napsal(a):
>>
>> In fact, "untrue" gyroscopes are more true gyroscopes than "true"
>> gyroscopes. "True" gyroscopes are not not well suited
>> for "watching the circle",
>> they just try to keep the platform free from any rotation.
>>
>> There are 2 possible approaches for inertial systems, wrt rotation:
>> 1/ to keep the orientation
>> 2/ to know how orientation changed
>>
>> In fact, systems based on MEMS are reaching quality of classical
>> gyroscopes, with advantage of price, mass, volums and durability.

> You are imagining what is called a "strapped-down" inertial system. I
> believe that calls for Euler's equations which cannot be solved in
> closed form. This vehicle will be assuming all kinds of different
> orientations and it would be sheer folly to think that you could
> subtract gravity out of the real accelerations.


"Strapdown systems are nowadays commonly used in commercial and tactical
applications (aircraft, ships, ROV's missiles, etc.) and are starting to
become more widespread in applications where superb accuracy is required
(like submarine navigation or strategic ICBM guidance) and FOG based
strapdown inertial navigation systems have been selected by the UK Royal
Navy for the Astute class submarine and the Queen Elizabeth class
aircraft carriers."

https://en.wikipedia.org/wiki/Inertial_navigation_system#Strapdown_systems

> The inertial platform is actually set in a roll gimbal inside a pitch
> gimbal inside a yaw gimbal  fully retaining its inertial position
> throughout while the gimbal angles change as aircraft maneuvers. The
> gyroscope error signals are sent through  resolvers that perform
> matrix transformations, apportioning the torques to the correct
> gimbals.

I am aware of that.
But truth is, not limited to gyroscopes and navigation systems,
people experienced in past technology
often ignore advances of incoming technologies.
What was true 2 years ago need not to be true now.

> The general idea as I said in the 1st place is preserve and protect
> the accelerometers so they measure only navigational accelerations.
> The error signals from the gyroscope provide the rigidity required to
> resist torques from the gimbal angles as they change.
> I also mentioned that the accuracy needs to be at least .01° per hour
> which translates to 0.000002778° per second and the resolution of the
> mems might be 0.03, and therefore nowhere qualified for navigation
> purposes.

Peiple saying it is not possible
should not interupt those doing it. ( chinese proverb )

All depends on purpose of the navigation.
For some applications 0.01 deg / hour is far from needed.

To have the platform leveled is equivalent
to knowledge how it is tilted.


> Ti si hloupak!

Correct form would be "Ty jsi hlupák !"
But such a calling would say more about its author...


-- 
Poutnik ( the Czech word for a wanderer )

Thread

Sensors in Motion Launches MEMS-Based Inertial Nav System Sam Wormley <swormley1@gmail.com> - 2015-07-25 20:23 -0600
  Re: Sensors in Motion Launches MEMS-Based Inertial Nav System kefischer <emoneyjoe@iglou.com> - 2015-07-26 15:40 -0400
    Re: Sensors in Motion Launches MEMS-Based Inertial Nav System wobbly <wobbly@dont-email.me> - 2015-07-28 22:14 +0000
  Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-07-26 23:20 +0000
    Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Lofty Goat <rlwatkins@gmail.com> - 2015-07-26 23:46 -0500
  Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Lofty Goat <rlwatkins@gmail.com> - 2015-07-26 23:44 -0500
    Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-07-27 22:52 +0000
      Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-07-28 16:41 -0400
        Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-01 12:32 +0200
          Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-02 15:51 -0400
            Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-02 20:29 +0000
            Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-03 01:12 +0200
              Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-03 00:07 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-03 12:17 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-08-03 09:36 -0700
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-03 19:00 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Bohuš Matuška <bohu@paranetnet.net> - 2015-08-03 18:01 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-03 20:31 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Bohuš Matuška <bohu@paranetnet.net> - 2015-08-03 19:28 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-03 18:01 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-03 14:52 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-03 23:00 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-06 10:36 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-07 07:58 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-07 08:35 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-07 10:13 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-08 00:26 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-07 22:25 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-08 07:14 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-08 05:44 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Emmerich Schultheiß <emme@noemail.thx> - 2015-08-08 13:23 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-08 10:16 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-08 10:34 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-09 10:47 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-09 17:09 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Emmerich Schultheiß <emme@noemail.thx> - 2015-08-09 17:24 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-09 17:56 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-09 20:05 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-09 18:44 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Emmerich Schultheiß <emme@noemail.thx> - 2015-08-09 19:08 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-10 10:49 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-09 19:53 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-09 18:47 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-09 17:52 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-10 00:07 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-09 22:33 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Felipe Delgado <fd@spreadspectrum.org> - 2015-08-09 22:55 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Felipe Delgado <fd@spreadspectrum.org> - 2015-08-09 22:58 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-10 10:54 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-10 17:38 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Felipe Delgado <fd@spreadspectrum.org> - 2015-08-10 18:07 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-11 01:11 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-10 23:28 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-09 20:43 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-10 10:55 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-10 11:01 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-10 09:32 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-10 17:42 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-11 11:38 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-11 23:00 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-11 22:27 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-11 22:12 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Tom Roberts <tjroberts137@sbcglobal.net> - 2015-08-12 23:32 -0500
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-13 07:32 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Odd Bodkin <bodkinodd@gmail.com> - 2015-08-13 07:30 -0500
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Mahipal <mahipal7638@gmail.com> - 2015-08-13 05:50 -0700
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Felipe Delgado <fd@spreadspectrum.org> - 2015-08-13 13:11 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Odd Bodkin <bodkinodd@gmail.com> - 2015-08-13 08:23 -0500
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Felipe Delgado <fd@spreadspectrum.org> - 2015-08-13 13:28 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-13 15:20 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Felipe Delgado <fd@spreadspectrum.org> - 2015-08-13 13:22 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Odd Bodkin <bodkinodd@gmail.com> - 2015-08-13 07:24 -0500
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-13 15:10 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Felipe Delgado <fd@spreadspectrum.org> - 2015-08-13 13:15 +0000
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-13 15:21 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-13 16:26 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Odd Bodkin <bodkinodd@gmail.com> - 2015-08-13 16:35 -0500
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-13 21:52 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Odd Bodkin <bodkinodd@gmail.com> - 2015-08-14 07:42 -0500
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-14 14:04 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System dsr@mail.lns.cornell.edu (Daniel S. Riley) - 2015-08-13 12:27 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-11 22:20 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-09 11:39 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-09 12:42 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-11 14:40 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Poutnik <poutnik4nntp@gmail.com> - 2015-08-11 22:35 +0200
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Jackpol11@hotmail.com - 2015-08-12 21:56 -0400
                Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-03 17:57 +0000
      Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2015-07-30 11:03 -0400
        Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2015-08-04 03:10 -0400
          Re: Sensors in Motion Launches MEMS-Based Inertial Nav System jimp@specsol.spam.sux.com - 2015-08-04 17:24 +0000
    Re: Sensors in Motion Launches MEMS-Based Inertial Nav System wobbly <wobbly@dont-email.me> - 2015-07-28 22:01 +0000
  Re: Sensors in Motion Launches MEMS-Based Inertial Nav System "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-08-03 09:34 -0700

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