[PSUBS-MAILIST] Inertial navigation, 3-axis

Sat Dec 13 23:11:59 EST 2014

Hi Guys,

As I understand it, the accuracy and cost of the INS sensors have continued 
 to improve substantially.  The specs I see now compared to what I  was 
seeing a couple of years ago seem to indicate that, however I've not  had any 
direct experience with them.  The first challenge is then to  integrate it 
into a display system.  If you've seen Cliff's display in the  R300, that's 
the type I'm talking about although he doesn't have an INS, and  that display 
doesn't have an easy download function.  It's my  understanding that a later 
model does have capability for logging  and downloading to a thumb drive.  

Alec, thanks for sharing your experience.  I think a couple of other  guys 
have researched INS in the past.

Steve M., this might be a great topic for a tech session at our next  
convention by someone with an electronics background.  I'm somewhat lacking  in 
that department.

Cheers,
Jim T.

In a message dated 12/13/2014 7:31:59 A.M. Central Standard Time,  
personal_submersibles at psubs.org writes:

I worked with a volunteer who developed a low cost system with a small  
screen and a low cost sensor of the class used in cell phones. The display had  
a "start" button to reset, and displayed a track of the path followed. He 
did  a great job of it, but our conclusion was the sensor just didn't have  
sufficient accuracy yet. This was about 2/3 years ago.

Best,

Alec

On Dec 12, 2014, at 10:07 PM, Hugh Fulton via Personal_Submersibles  
<_personal_submersibles at psubs.org_ (mailto:personal_submersibles at psubs.org) >  
wrote:

Hi  Jim, 
That  is a really great bit of information you have posted.  I am really 
keen  to progress something that is afforadable.  Has anyone put together an  
INS system which is low cost? 
I  was in touch with someone a couple of years ago who was going to do a 
system  for less than half what is currently available but have not heard 
anything  more.  Any other leads? 
Regards,   Hugh  

From:  Personal_Submersibles 
[mailto:personal_submersibles-bounces at psubs.org]  On Behalf Of via Personal_Submersibles
Sent: Saturday, 13  December 2014 3:05 p.m.
To: _personal_submersibles at psubs.org_ 
(mailto:personal_submersibles at psubs.org) 
Subject:  [PSUBS-MAILIST] Inertial navigation,  3-axis

Hi Hank,

I'm a bit delayed in  getting back to you.  Below are some links regarding 
Inertial  Navigation Systems (INS).  Some are specifically designed  for 
underwater applications.  The modules have become quite  small (1" square).  My 
desire is to have the entire track display  onscreen and download it to a 
thumb drive at the end of the  mission.  

One of the  advantages of 3-axis INS is that it can provide heading, depth, 
rate of  ascent/descent, speed independent of current, drift, tilt, etc.

Obviously a starting  point has to be established on the surface (GPS or 
other position  reference and compass heading).  However in many situations  
such as when operating from a lake ramp, you could just label the  launch as 
"Starting Point" and call the initial heading "0" or  whatever no matter 
which direction you're headed assuming you're going  to be returning to the 
starting point.

SBG Systems has been  making rapid advancements in accuracy and cost 
reduction for INS.   However inertial changes in small, manned submersibles are 
much smaller than  in submarines, boats, and aircraft.  If I were to the point 
of putting  together a system, I would contact them for advice on which 
components to  use to build it.

Jim

SBG  Systems:

http://www.sbg-systems.com/products/subsea-inertial-systems-overview

http://www.sbg-systems.com/products/inertial-systems-overview

http://www.sbg-systems.com/docs/Article-SBG-SYSTEMS-ON&T.pdf

http://www.sbg-systems.com/products/ig-30-3d-compass

Sparkfun:

https://www.sparkfun.com/products/12916

https://www.sparkfun.com/search/results?term=compass&what=products

OceanServer:

http://www.oceanserver-store.com/

http://www.ocean-server.com/compass.html?gclid=CKHazZGbiLMCFQpgMgodAQgALg

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