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I'm trying to eliminate the error (or at least
offset it a little bit) by drawing a circle in the diameter of the extra line
let out and then finding the coords in the middle of the circle.
Still at no time with the degree of error be any
greater than the length of the teather + the degree of error that an GPS system
has. I think with the extra step I take I could at least narrow it down by
half.
George Slaterpryce
----- Original Message -----
Sent: Friday, April 07, 2006 3:42
PM
Subject: RE: [PSUBS-MAILIST] Once
again
George:
My first question regarding this is "how accurate do you need to be?"
I think there's going to be some error regarding the position of your sub
verses the position of your float. For example: drag is going to cause
the cable to curve. (Think of the kite-flying anology) Also, wind is
going to move the bouy around... so it might actually be overhead, beside, or
ever in front of your sub.
I'm personally planning on going with the
GPS-on-surface/IGS-submerged route. I'll be watching this thread to see
what other folks post.
Take care,
NP
From: "George Slaterpryce"
<gslaterp@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: "PSUBS
Mailing List"
<personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST]
Once again
Date: Fri, 7 Apr 2006 13:18:22
-0400
>Once again I come unto you the great PSubbers community
with my
>Thoughts, Musings and questions. Ye, Verilly... or
something.
>
>First thought, Problem, location underwater. How
to ascertain the
>exact (or as near as exact) location of an object
under water such
>as a sub. Problem is I don't know how deep you can
reliabley get a
>GPS signal. So I thought of this solution that may
not be the most
>elegant but I think it would get the job done pretty
well.
>
>GPS Bouy on a teather released form depth to the
surface.
>You know the depth to the surface, so whatever line you
released
>over the depth would be your varience. From there you could
get the
>GPS location, calculate two more points on a circle path,
then find
>the center point of that, which would give you your GPS
location.
>(Illustration below)
>
>(or if you can't see
them)
>http://www.captovis.com/marine/designsketches/uwloco.png and
>http://www.captovis.com/marine/designsketches/uwloco2.png
>
>Seem
like a good idea to anybody else? comments? Detractions?
>Improvements?
>
>George
Slaterpryce
>
>
>
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