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GPS FORUM » Is it possible to increase the accuracy of a bluetooth GPS device?

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Joey
PostPosted: 2007-01-03 21:52:21
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Conor
PostPosted: 2007-01-04 16:51:25
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In article , Joey
says...
>
No. THe inaccuracy is down to what the US Military has decided
civilians can have.


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Conor

Youre not married,you havent got a girlfriend and youve never seen
Star Trek? Good Lord! - Patrick Stewart


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Tumbleweed
PostPosted: 2007-01-04 17:17:10
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Conor wrote in message
news:MPG.200740eb35fe8f69989968@news.karoo.co.uk...
> In article , Joey
> says...
>>
> No. THe inaccuracy is down to what the US Military has decided
> civilians can have.
>
>

No its not.

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email replies not necessary but to contact use;
tumbleweednews at hotmail dot com


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Marc Brett
PostPosted: 2007-01-05 12:15:55
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On Wed, 03 Jan 2007 21:52:21 GMT, Joey wrote:

The bluetoothiness of a GPS device [receiver?] has no effect on its accuracy,
so we can ignore that part of your request.

Things you can do:
- make sure the antenna has a clear view of the sky
- set the elevation mask to a sensible value
- use it at times of the day when satellite geometry is good
- use WAAS, DGPS if your receiver supports them
- avoid solar storms which play havoc with the ionosphere
- stay away from sources of interference
- average results over time


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DavidM
PostPosted: 2007-01-05 13:03:23
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Marc Brett wrote, On 05/01/2007 12:15:
> On Wed, 03 Jan 2007 21:52:21 GMT, Joey wrote:
>
> The bluetoothiness of a GPS device [receiver?] has no effect on its
accuracy,
> so we can ignore that part of your request.
>
> Things you can do:
> - make sure the antenna has a clear view of the sky
> - set the elevation mask to a sensible value
> - use it at times of the day when satellite geometry is good
> - use WAAS, DGPS if your receiver supports them
> - avoid solar storms which play havoc with the ionosphere
> - stay away from sources of interference
> - average results over time
>

Try VisualGPS (http://www.visualgps.net/VisualGPS/default.htm) if you
want to see how the satellites signals varie, and the affect it has on
your calculated location.

--
DavidM newsNO@SPAMdjmorgan.org.uk
www.djmorgan.org.uk


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Anthony R. Gold
PostPosted: 2007-01-07 11:25:48
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On Thu, 4 Jan 2007 17:17:10 -0000, Tumbleweed
wrote:

>
> Conor wrote in message
> news:MPG.200740eb35fe8f69989968@news.karoo.co.uk...
>> In article , Joey
>> says...
>>>
>> No. THe inaccuracy is down to what the US Military has decided
>> civilians can have.
>
> No its not.

Why was that wrong? The specifications of the signal and the system used
by civilians was indeed specified by the US DoD. You may be reading more
into what Conor wrote than was actually there.

Tony


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R. Mark Clayton
PostPosted: 2007-01-07 12:07:22
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Conor wrote in message
news:MPG.200740eb35fe8f69989968@news.karoo.co.uk...
> In article , Joey
> says...
>>
> No. THe inaccuracy is down to what the US Military has decided
> civilians can have.

Well actually William Jefferson Clinton on 1/5/00, although technically he
was the commander of the US military at the time. See: -
http://www.ostp.gov/html/0053 2.html

so for the time being it is the same for most of the world (may degrades
over Iran etc., but difficult given the satelites 20Mm orbits).

There was a method called differential GPS to correct the inaccuracy before
that, but I doubt that this would make much difference now, even if it had
been persisted with.

>
>
> --
> Conor
>
> Youre not married,you havent got a girlfriend and youve never seen
> Star Trek? Good Lord! - Patrick Stewart


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Steve Firth
PostPosted: 2007-01-07 13:57:19
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Joined: 2007-01-07 13:57:19
On Sun, 7 Jan 2007 12:07:22 -0000, R. Mark Clayton wrote:

> There was a method called differential GPS to correct the inaccuracy before
> that, but I doubt that this would make much difference now, even if it had
> been persisted with.

Errrm dGPS is still alive and well and gives better accuracy than GPS
alone. dGPS is currently functioning in 40 countries around the world and
provides accuracy better than 5 metres. Trinity House use dGPS to
accurately position navigational aids, and commercial shipping relies
heavily upon dGPS.


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