There's a substantial literature on 'passive acoustic localization', mostly=
as Bernie indicates
from the marine mammal literature. Quite a bit of it emerges from long term=
placements of
passive monitoring buoys. Mellinger's freeware program 'Ishmael' has code =
modules for
analyzing source position from various configurations of hydrophones.
For birds, folks associated with Cornell labs (and others) have deployed mi=
crophone arrays to
monitor at smaller scales time and place of calls from territorial song bir=
ds. This also has
worked for 2 or 3d flying bat localization. There are a number of 'one-off=
' studies, but more
recently several groups have been using Raimund Specht's multi-microphone=
systems and
signal capture/software software.
Some interesting wrinkles emerge in discussions of elephant calling in that=
they are described
as relying on reflecting calls off low level atmospheric inversions to exte=
nd their
communication range.
Bill R.
>
> However, I believe Chris Clark, at Cornell, has done this in a marine =
> environment with a hydrophone array while monitoring Bowhead Whales.
> His questions were how many were in the pod? and where were they
> located in relationship to one another? With the tetrahedral array, I =
> think he got some good data, if I recall correctly. I don't know if
> he's published, but I think so.
>
> Bernie
>
> On Dec 17, 2008, at 5:05 AM, Marc Myers wrote:
>
> > Hi Bernie
> > Thanks for the prompt response.
> > What gear have you used, what software are you using and are any of =
> > the results published?
> > Marc
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