[PSUBS-MAILIST] New Generation Inertial Sensors - Twice as Accurate

Sat Mar 25 11:38:08 EDT 2017

Alan,
That is really interesting.  I got the impression that the smallest  
package they sell is one surface unit with three under-water units.   However that 
might be negotiable.
Jim

In a message dated 3/24/2017 10:34:13 P.M. Central Daylight Time,  
personal_submersibles at psubs.org writes:

Jim,
this is interesting, it's a diver tracking system  called diver 6.
The video gives a good overview Not sure of the  price.
http://www.diver6.com/
Hope you get back on your project soon.
Alan

Sent from my iPad

On 25/03/2017, at 2:41 PM, via Personal_Submersibles 
<personal_submersibles at psubs.org>  wrote:

Alan,

That's quite interesting.  I haven't been familiar with acoustic  modems.  
In addition to positioning, I can appreciate that they would  have greater 
range capabilities for communication than the other (but much  cheaper) 
technology that we have accessible as amateurs

I've had to pull way back from my focus on sub design and technology  for a 
good while.  By the time I return I'm hoping you guys will be  field 
testing Inertial Navigation Systems and have a couple of  different configurations 
to share info on.

Cheers,
Jim 

In a message dated 3/24/2017 3:48:40 P.M. Central Daylight Time, 
personal_submersibles at psubs.org  writes:

Jim,
just had a look in Sea Technology magazine  March edition, ( free online 
magazine)
& saw this...
http://www.link-quest.com/html/intro2.htm
It is a small module that tracks an underwater  vehicle, has GPS & 
communicates
to the vehicle via an onboard PC or whatever.  Haven't studied it, but I am 
sure
it could translate the underwater vehicles  position to maps on the 
vehicles PC.
These days you have GPS mapping apps on your  cel phone, so it wouldn't be 
too
hard. The next stage would be using the  position signal from the submarine 
to
control motors on the buoy to follow it. On  quad copters they have GPS & 
return
to start functions that return the quad copter  to it's launch position 
should it's
transmitter lose contact. So the sought of  technology to control the buoy 
thrusters
through position signals is alive & well  & cheap.
   I won't be pursuing it, as I need  to make my sub first :)
Alan

Sent from my iPad

On 25/03/2017, at 6:53 AM, Alan via Personal_Submersibles 
<personal_submersibles at psubs.org>  wrote:

Jim,
yes. Just an intermittent signal every 10 seconds or so. I  have
read about text type communication systems.
Here is a passage from a paper that talks about a buoy  device.

An  underwater GPS is primarily a combination of a GPS and an acoustic  
positioning system and consists of two types [12-19]: a sea surface buoy  
system using a long baseline and carrying a GPS receiver, which can  track, 
monitor, and dynamically position underwater targets from a sea  surface, coastal 
land, and a plane and has a large operating range but  can only position 
underwater targets that carry acoustic transponders in  certain waters; and a 
system which uses a mother ship equipped with a  short baseline or ultra 
short baseline transceiver and a GPS receiver,  which is mobile and flexible 
but also can only position targets equipped  with acoustic transponders. 
Therefore, this paper proposes a way of  positioning combining an ultra short 
baseline, a forward-looking sonar  and a GPS receiver, overcoming the 
limitation of the existing underwater  GPS positioning technology that it can only 
position targets equipped  with acoustic transponders and realizing the 
real-time positioning of  the longitude and latitude coordinates of any unknown 
targets in any  waters in the WGS84 ellipsoidal coordinate system, and it is 
also highly  mobile. 
Alan 

Sent from my iPad

On 25/03/2017, at 6:06 AM, via Personal_Submersibles 
<personal_submersibles at psubs.org>  wrote:

Alan,
Transmit GPS positions wirelessly where?   You didn't mean down to the sub, 
did you?
Jim

In a message dated 3/23/2017 10:07:37 P.M. Central Daylight Time,  
personal_submersibles at psubs.org  writes:

Jim,
re the tow behind buoy (pronounced boy);  it would be possible to make a 
buoy with motors on it that tracked your  sub & transmitted GPS positions
wirelessly. Minn kota have a system that  controls their thruster to keep
a boat steady on a certain  coordinate. 
Alan

Sent from my iPad

On 24/03/2017, at 3:43 PM, via Personal_Submersibles 
<personal_submersibles at psubs.org>  wrote:

Here's a link that gives quite a bit of  information including a reference 
to their Windows-based  software.  Once you open the link, the more you 
scroll down  the more you will see; it goes a long way! 
http://www.seismic.com.au/assets/pdf/SBG_Systems-Ellipse_Series_Brochure.pdf

GPS is great as a starting point before you  submerge and for telling you 
where you are once you surface.   Too bad radio signals don't propagate so 
well under  water.  In the past we've discussed mounting a GPS antenna on  a 
Diver Below buoy with a cable running to the sub.  I don't  recall what was 
said regarding theoretical depth limitations for  such a setup as well as the 
hydrodynamics of towing  it.

It would be really interesting to see how well  your INS position matches 
up with your GPS when you  resurface.  I like the idea of knowing just where 
you are  with reasonable precision when submerged, being able to return to  
a precise location on another day, being able to search or survey  
methodically, navigating from A to B to C, etc.

Jim T.

In a message dated 3/23/2017 7:55:50 P.M. Central Daylight  Time, 
personal_submersibles at psubs.org  writes:

On 3/23/2017 6:40 PM, Brian Cox via  Personal_Submersibles wrote:

There needs to be an underwater GPS   !!

I remember a discussion, long  ago, about a GPS antenna on a mast.  I don't 
recall any  resolution.

Mike

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