----- 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