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   Re: Galileo purported 1 m [horizontal?] position a...
| Bjorn Gabrielss... | 12-28-2005 |
 Re: Galileo purported 1 m [horizontal?] position a...
| David L. Wilson | 12-29-2005 |
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According to this source Galileo will provide 1 m accuracy (assumed
global 95% confidence).
http://news.bbc.co.uk/2/hi/science/nature/4555298.stm
"We are aiming to provide one-metre, worldwide accuracy through
Galileo's 'open' service - this is not possible today without regional
or local augmentation," said Esa's Galileo project manager, Javier
Benedicto."
On page 14,Table 1 of the Galileo Mission High Level Definition
document (http://tinyurl.com/7fp3h ) it shows 4 m (95%) horizontal
position accuracy for dual frequency users.
Why such a difference in projected position accuracy and what
assumptions is EU making for space and user equipment errors? Imagine
a consumer grade Garmin Etrex. What is its error contribution to
position accuracy? Beyond the reduction in iono error using dual
frequency how does the EU come up with 1 meter?
Ron Lee
Ron Lee wrote:
That seems to be very conservative...??? Dual-Freq. receivers should be more
accurate than that... You can (almost) get 1m accuracy with a modern
hand-held...
> http://news.bbc.co.uk/2/hi/science/nature/4555298.stm
>
> "We are aiming to provide one-metre, worldwide accuracy through
> Galileo's 'open' service - this is not possible today without regional
> or local augmentation," said Esa's Galileo project manager, Javier
> Benedicto."
>
> On page 14,Table 1 of the Galileo Mission High Level Definition
> document (http://tinyurl.com/7fp3h ) it shows 4 m (95%) horizontal
> position accuracy for dual frequency users.
>
> Why such a difference in projected position accuracy and what
> assumptions is EU making for space and user equipment errors? Imagine
> a consumer grade Garmin Etrex. What is its error contribution to
> position accuracy? Beyond the reduction in iono error using dual
> frequency how does the EU come up with 1 meter?
>
> Ron Lee
>
> "We are aiming to provide one-metre, worldwide accuracy through
> Galileo's 'open' service - this is not possible today without regional
> or local augmentation," said Esa's Galileo project manager, Javier
> Benedicto."
>
> On page 14,Table 1 of the Galileo Mission High Level Definition
> document (http://tinyurl.com/7fp3h ) it shows 4 m (95%) horizontal
> position accuracy for dual frequency users.
>
> Why such a difference in projected position accuracy and what
> assumptions is EU making for space and user equipment errors? Imagine
> a consumer grade Garmin Etrex. What is its error contribution to
> position accuracy? Beyond the reduction in iono error using dual
> frequency how does the EU come up with 1 meter?
>
> Ron Lee
--
Jack
Get general GPS information at: http://www.gpsinformation.net/
Ron Lee wrote:
>how does the EU come up with 1 meter?
They are using more precise clocks in the satellites.
Manfred
> I thought it was because the US system used feet and inches internally
Do they?
Bjorn Gabrielsson wrote:
>
>
>
>>I thought it was because the US system used feet and inches internally
>
>
> Do they?
>
> Do they?
No.
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> According to this source Galileo will provide 1 m accuracy (assumed
> global 95% confidence).