Brian,
I intend to install this very system aboard a small ambient sub. The idea I have in mind is to select an omni-dirrectional hydrophone when the system is trained aft (All you would hear at this location is your own boat anyway) and train to better isolate biologic and boat traffic only when desired or when needed to avoid collisions.
During normal operation, this narrow beam width (which has yet to be verified) and labor intensive search would require too much submarine operator intervention to be practical. (You are quite busy already!)
For a 1 atm submarine, the number of thru hulls is quite large being some 36 for this system.
Let me finish and fully test this before we draw any conclusions as to its usefulness. It may turn out simply to be a desire to in a small way duplicate the highly sophisticated sonar's I was privileged to operate and maintain while on active duty.
The basic idea of stator brush selectivity of hydrophones could perhaps be changed to incorporate a selective area of coverage while providing very accurate contact bearing determinations. (An intensified search covering a small geographic area )(straight ahead and perhaps 60 degrees wide?)
During underwater communications sessions, the ability to train to a dirrection more in line with the transmission source would allow for a higher ability to recieve and interpret incomming voice messages.
David Bartsch
From: ojaivalleybeefarm@dslextreme.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] passive hydrophone array pictures!
Date: Sun, 12 Jul 2009 21:21:53 -0700
David,
Why are you think they will not have any use on small submersibles?
Brian
Jon,
Having been in the Navy as a sonar technician, I was really curious if I could actually pull off a trainable passive sonar system. In that such a system would require almost constant investigation, it would really have little or no use aboard these really small submarines but perhaps some larger vessels could see a use for such a system.
It is really just a personal challenge that I undertook this project. It would still be interesting to see how effective and accurate this set up will be.
David Bartsch
> Date: Sun, 12 Jul 2009 16:34:27 -0400
> From: jonw@psubs.org
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] passive hydrophone array pictures!
>
>
> David,
>
> Thanks for posting the photos. I recall you saying something about the
> plastic cups as far as directionality, but I don't recall exactly what
> it was. Assuming the plastic cups are not effective at producing
> directionality, what do you hope to come up with in terms of testing
> data? Assuming you found a material that did effectively provide
> directionality, would it be more advantageous to have one element that
> could be rotated, rather than 18 elements that are switched
> mechanically? Also, since part of the reason for having one of these is
> for surface collision avoidance, it would seem that a 20 degree cone
> would be a bit narrow when surfacing and a unit pointing upwards will be
> required.
>
> Jon
>
>
>
> David Bartsch wrote:
> > To all:
> >
> > I have posted five 18 hydrophone passive sonar array pictures for
> > you to view.
> >
> > These have been placed under "resources and references" then under
> > "projects and photos" then select "David Bartsch" and finally "passive
> > sonar".
> >
> > It is a work in progress and I have much work to do prior to its
> > completion.
> >
> > Enjoy them and please share with us your thoughts and ideas. (keep
> > this open forum to assist in generating further discussions and
> > comments please)
> >
> >
> > David Bartsch
> >
> > ------------------------------------------------------------------------
> > Windows Live™: Keep your life in sync. Check it out.
> > <http://windowslive.com/explore?ocid=TXT_TAGLM_WL_BR_life_in_synch_062009>
>
>
>
>
> ************************************************************************
> ************************************************************************
> ************************************************************************
> The personal submersibles mailing list complies with the US Federal
> CAN-SPAM Act of 2003. Your email address appears in our database
> because either you, or someone you know, requested you receive messages
> from our organization.
>
> If you want to be removed from this mailing list simply click on the
> link below or send a blank email message to:
> removeme-personal_submersibles@psubs.org
>
> Removal of your email address from this mailing list occurs by an
> automated process and should be complete within five minutes of
> our server receiving your request.
>
> PSUBS.ORG
> PO Box 53
> Weare, NH 03281
> 603-529-1100
> ************************************************************************
> ************************************************************************
> ************************************************************************
>
Insert movie times and more without leaving Hotmail®. See how.
Lauren found her dream laptop. Find the PC that’s right for you.
|