Sent: Wednesday, December 01, 2010 9:24
PM
Subject: RE: [PSUBS-MAILIST] directional
passive sonar has arrived!
Alan,
Before this system (although it
has yet to be better refined) a grid search was all that a surface craft could
do to locate a disabled submarine equipped with a distress pinger. Now with
this system deployed aboard the surface support vessel, no grid search would
be required but simply the training of this sonar onto the source of this
transmission!
David Bartsch
From: alanjames@xtra.co.nz
To: personal_submersibles@psubs.org
Subject:
Re: [PSUBS-MAILIST] directional passive sonar has arrived!
Date: Mon, 29
Nov 2010 21:04:45 +1300
David,
You could possibly use this to conduct grid
searches.
You could have a surface boat with GPS tracking a
certain course, & the sub on the bottom
following sounds emitted from the surface
craft.
Alan
----- Original Message -----
Sent: Monday, November 29, 2010 7:20
PM
Subject: RE: [PSUBS-MAILIST]
directional passive sonar has arrived!
I was using the Sierra 1 rc Bismarck and the
range was 200' at the farthest. Normal boat traffic will no doubt be picked
up much farther. It does get flaky when the range is less than 20' but
farther out it's great. If I add the analog meter circuit this should get
this to within 1 to 3 degrees! The farther out from the array the more
accurate the results.
The next logical step is for Jens to
come up with a time delay circuit whereby three fix mounted hydrophones at
the base of a K250/350 can determine the actual bearing with beam forming as
apposed to turning an actual array. This is where we intend to go with this.
There are some bugs to work out. The need for shielding of
signal wires came in loud and clear as I once again heard radio
stations...when I ran the rc boat I almost went deaf!
It's
like when "skunk works" found what shape best evaded radar. Once discovered,
they were handed it back and told to find a way to make it
fly...
We have a passive sonar that can show the bearings of
detected contacts. All we need now is a simple way to install and use on
these small submarines. We have our work cut out for us.
I
was very impressed with this first in-water test of this
system.
David Bartsch
From: alanjames@xtra.co.nz
To:
personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] directional
passive sonar has arrived!
Date: Mon, 29 Nov 2010 17:40:55 +1300
Keep at it David sounds great.
I guess you now have the added security that you will
be able to tell
what direction the crocodiles comming from. (Lake
Placid movie)
Alan
----- Original Message -----
Sent: Monday, November 29, 2010 3:09
PM
Subject: [PSUBS-MAILIST] directional
passive sonar has arrived!
To all:
I just tested the passive
binaural sonar system in the waters of Lake Placid in Chickasaw State Park
just East of Henderson, Tn. today. This system can determine the exact
bearing to a given detected passive sonar contact within about 5 degrees
and should prove even more accurate once an analog meter system is
deployed.
There are still a few issues to work out such as
proper shielding to avoid radio reception and better sound mounting to
avoid self generated noise.
Passive directional sonar
has finally arrived!
David
Bartsch