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| Subject: | GISList: RE: GPS and powerline question |
| Date: |
02/18/2003 01:41:07 PM |
| From: |
Randy Edwards |
|
|
Regarding the question of GPS and powerlines, we have a lot of experience s=
urveying near and around high-tension powerlines, and haven't noticed degra=
ded GPS performance (note - we are typically doing large area environmental=
assessments (ie: centimeter accuracy not needed!)). I've only noticed pro=
blems when surveying right near the base of large towers, where the tower i=
tself physically shadows a satellite or two - a large tree could do the sam=
e thing!
For more formal information, this, according to the Electric Power Research=
Institute (EPRI):
Electromagnetic Compatibility of Power Lines and GPS receivers
The global positioning system (GPS) is a satellite-based radionavigation sy=
stem that has many new civilian applications for the position, velocity, an=
d time information it can provide. As GPS use expands, it becomes more impo=
rtant to evaluate any potential sources of interference. One issue that is =
sometimes raised is the potential for degraded perfomance of GPS receivers =
when they are used near electric power facilities. of specific interst is t=
he use of the GPS satellite-based microwave signals under or near power lin=
e conductors. With support from EPRI, Prof Olsen has been studying the poss=
ibility of this interference. It has been shown unlikely that power line co=
nsuctors will interfere with use of the GPS satellite signals. (for more in=
formation please contact: olsen@eecs.wsu.edu.)=20
Look for the word 'GPS' on the web page http://www.eecs.wsu.edu/power/resea=
rch.html as a source.
Hope this helps!
Randy Edwards
Applied Technology Services Leader
Jones & Stokes
11820 Northup Way, Suite E300
Bellevue, WA 98005-1946
(425) 893-6420
-----Original Message-----
From: Steven M. Robertson [mailto:dog@arkansas.net]=20
Sent: Friday, February 14, 2003 11:24 AM
To: Mohammad A Rajabi: Dan McIntyre: gislist@geocomm.com
Subject: Re: GISList: GPS and powerline question
I emailed the Trimble support and Thales Navigation about this issue and on=
e of Trimble's reps called me and gave an affirmative to whether or not the=
elctromagnetic field around powerlines affects GPS recievers. He said one =
solution would be to use "offset points". I haven't heard back from Thales =
Navigation.
----- Original Message -----
From: "Mohammad A Rajabi" <marajabi@hotmail.com>
To: "Dan McIntyre" <d_mcintyre@site.ntu.edu.au>: <gislist@geocomm.com>
Sent: Thursday, February 13, 2003 10:09 PM
Subject: Re: GISList: GPS and powerline question
> Hi,
>
> I did a Google search and among others I found the followings more=20
> interesting. Hope it helps.
>
>
> http://www.isaust.org.au/innovation/2001-Spatial_Odyssey/pdf/gibbings.
> pdf
>
> http://www-aadc.aad.gov.au/spatial_data/gps/gps_capture.asp
>
> http://www.gisdevelopment.net/tutorials/tuman004a.htm
>
>
> Best Wishes
> Mohammad
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Dept. of Geomatics Eng.
> University of Calgary
> 2500, University Dr., NW
> Calgary, Alberta
> Canada T2N 1N4
> Tel: 403-210-9497
> Fax: 403-284-1980
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
>
>
>
> ----- Original Message -----
> From: "Dan McIntyre" <d_mcintyre@site.ntu.edu.au>
> To: <gislist@geocomm.com>
> Sent: Thursday, February 13, 2003 3:59 PM
> Subject: RE: GISList: GPS and powerline question
>
>
>
> Apart from personal observations, are there any published studies that=20
> demonstrate a clear relationship between the proximity of=20
> electromagnetic sources and compromised GPS performance? Seems like a=20
> cloudy issue.
>
> Regards
>
> Dan
>
> ----------------------------------------------------------------------
> ----
--
> ------------
> Dan McIntyre
> Research Associate (GIS Analysis)
> Key Centre for Tropical Wildlife Management
> Northern Territory University
> Darwin NT 0909
> Australia
> www.wildlife.ntu.edu.au
> e-mail: dan.mcintyre@ntu.edu.au
> ----------------------------------------------------------------------
> ----
--
> ------------
>
>
> ----------------------------------------------------------------------
> ----
--
> ------------
>
>
>
> -----Original Message-----
> From: Mohammad A Rajabi [mailto:marajabi@hotmail.com]
> Sent: Friday, 14 February 2003 02:05
> To: Gislist (E-mail)
> Subject: Re: GISList: GPS and powerline question
>
>
> Hi,
>
> I have worked with both handheld and geodetic GPS receivers for over a=20
> decade as well. In few occasions (not always) I have had problems=20
> with powerlines.
>
> Powerlines can be a source of trouble or not depending
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