|
|
| GeoCommunity Mailing List |
| |
| Mailing List Archives |
| Subject: | Re: [gislist] GPS underwater |
| Date: |
09/23/2003 11:25:01 AM |
| From: |
Steven M. Robertson |
|
|
Oh, I've heard that US submarines employ a method that involves letting an
antennae float to the surface while it is attached to the receiver inside
the sub, they may have some other reason for doing it but I think they use
it to supplement their navigation system.
----- Original Message -----
From: "Jane Gilleran" <JANE.GILLERAN@NUIGALWAY.IE>
To: <gislist@lists.thinkburst.com>
Sent: Tuesday, September 23, 2003 3:26 AM
Subject: RE: [gislist] GPS underwater
> GPS enabled mobile phone tags are being developed to track harbour seals.
They
> track the seals position but as Bill explained signals can only be
obtained
> when the seal comes to the surface.
>
> Choppy conditions make it difficult to get recordings. When the seal comes
> back in contact with a coastal phone mast it sends a text message with its
> position details.
>
> A nice application of the technology...
>
> Jane
>
>
>
>
>
> >===== Original Message From Bill Diaz <william.diaz@comcast.net> =====
> >A GPS receiver cannot function if the antenna is under water. The water
> >completely blocks the GPS signals.
> >
> >I have heard of underwater GPS applications, but the antenna was mounted
on
> >a buoy floating on the surface. Excessive wave height can block access
to
> >all available satellites, and the wave action itself can cause the GPS to
> >supply somewhat erratic data. If the underwater object is moving, the
> >antenna cable must be longer than the depth of the object. This means
that
> >the antenna will not be directly above the object. Similar effects will
be
> >observed in the presence of high winds or currents.
> >
> >Bill
> >
> >>-----Original Message-----
> >>From: gislist-bounces@lists.geocomm.com
> >>[mailto:gislist-bounces@lists.geocomm.com] On Behalf Of bader nader
> >>Sent: Monday, September 22, 2003 12:11
> >>To: arcgis@lists.directionsmag.com
> >>Cc: gislist@lists.geocomm.com
> >>Subject: [gislist] GPS underwater
> >>
> >>
> >>hi
> >>dose any one have information about using GPS
> >>underwater
> >>
> >>regards,
> >>
> >>
> >>__________________________________
> >>Do you Yahoo!?
> >>Yahoo! SiteBuilder - Free, easy-to-use web site design software
> >>http://sitebuilder.yahoo.com
> >>_______________________________________________
> >>gislist mailing list
> >>gislist@lists.geocomm.com
> >>http://lists.geocomm.com/mailman/listinfo/gislist
> >>
> >>_________________________________
> >>This list is brought to you by
> >>The GeoCommunity
> >>http://www.geocomm.com/
> >>
> >>Get Access to the latest GIS & Geospatial Industry RFPs and bids
> >>http://www.geobids.com
> >>
> >
> >_______________________________________________
> >gislist mailing list
> >gislist@lists.geocomm.com
> >http://lists.geocomm.com/mailman/listinfo/gislist
> >
> >_________________________________
> >This list is brought to you by
> >The GeoCommunity
> >http://www.geocomm.com/
> >
> >Get Access to the latest GIS & Geospatial Industry RFPs and bids
> >http://www.geobids.com
>
> --------------------------
> Jane Gilleran
> University of Aberdeen
> Lighthouse Field Station
> George St., Cromarty
> Ross-shire, IV11 8YJ
>
> Phone and Fax: 00 44 1381 600 548
>
> _______________________________________________
> gislist mailing list
> gislist@lists.geocomm.com
> http://lists.geocomm.com/mailman/listinfo/gislist
>
> _________________________________
> This list is brought to you by
> The GeoCommunity
> http://www.geocomm.com/
>
> Get Access to the latest GIS & Geospatial Industry RFPs and bids
> http://www.geobids.com
>
_______________________________________________
gislist mailing list
gislist@lists.geocomm.com
http://lists.geocomm.com/mailman/listinfo/gislist
_________________________________
This list is brought to you by
The GeoCommunity
http://www.geocomm.com/
Get Access to the latest GIS & Geospatial Industry RFPs and bids
http://www.geobids.com
|
|
Sponsored by:
For information
regarding
advertising rates
Click Here!
|
