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RE: [PSUBS-MAILIST] Acoustic Triangulation



There are two methods of acoustic triangulation, one from the sub and the other from a surface support ship.  The one easiest from the sub would use 2 or more (preferably at least 3) long-leg acoustic transponders are placed around the area of interest from the surface; each transmits on a unique frequency or is keyed on a unique pulse from the sub.  The simpler method of triangulation from the sub but more time consuming would have the acoustic receiver fix-mounted on the sub and the sub would rotate to find the strongest signal and thus the bearing to the transponder, the compass heading noted, and a bearing plotted.  The intersection of a series of bearings would provide an accurate position.  The other method from a submersible is to have the acoustic transducer able to be manually rotatable to find the bearings (similar to how the passive sonar transducer was mounted on early subs).  There are automated sonar rigs that will automatically interrogate the transponders and display position on a screen but are expensive.

 

The surface ship method involves placing a transducer on the sub that can be tracked with a scanning sonar (bearing and angle) on the ship.  The sub’s position is then transmitted to the sub over the UQC.  Early work on this method was conducted by a fellow intern at Harbor Branch during the summer of 82.  It used an Apple PC and Pascal for the position determination.

 

Despite what Steve says, large PSUBS are the exception not the rule.  The cost to build and maintain, draft constraints both in launching and harbor operation, and the complication on the design all go against successfully completing a large PSUB.  As I stated Euronaut is the exception, UC3 is still a concept and in need of a LOT of funds, and the only reference I can find to Spurdog is the lone image on the PSUBS.org website…the question is, does it dive?  George’s K-250/K-350 designs are probably the most prevalent submersible due to the simplicity of it’s design, construction, and operation.  This sub’s size is also a good representation of most other PSUBs as anything larger is to heavy to trailer conveniently and impossible to launch/recover without the services of an expensive crane.

Respectfully,

Jay K. Jeffries

Andros Is., Bahamas

 

 

 


From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Joseph Perkel
Sent: Saturday, April 08, 2006 8:03 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Acoustic Triangulation

 

Stephen,

It seems to me the original question was for "precise" underwater navigation. So I suspect Jay is talking about pulse beacons on the seafloor of some type. I will defer to his expertise to elaborate but, I remember reading about an expedition to pacific thermal vents using this method.

I can tell you that as a diver, even with GPS to guide the boat, I have returned to many a same dive site only to have some trouble finding my target again, especially small ones.

My Octopus, as a self reliant vessel, would only leave periscope depth in sound phone contact with a surface escort to keep tabs on traffic, and will navigate in known waters, on compass and depth finder (an acoustic device). Someone with a research or salvage capable craft needs more capability.

It would be interesting to hear from Dan H, as to how he navigates his K350?

Joe


From: "Stephen Pearce" <sjpearceqld@bigpond.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST] Acoustic Triangulation
Date: Sat, 8 Apr 2006 20:16:23 +1000

I thought this might be better as a separate string!

 

Jay K Jeffries wrote:Let’s get a grasp on reality here, it is obvious that many here haven’t spent a whole lot of time underwater whether scuba diving or in a submarine or

Submersible.’

 

and “Probably the most economical solution is acoustic triangulation.”

 

As there seams to be a desire and maybe even a trend towards larger subs (UC3, Euronaut, Spurdog and possibly others on the drawing board) can you expand on your ideal system utilizing acoustic triangulation. Enquiring minds and all that…..

 

Regards

 

Steve P

OWSI, 107386

 

 

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