[ntp:questions] Re: First Galileo satellite launched

David L. Mills mills at udel.edu
Wed Dec 28 20:50:49 UTC 2005

Danny & Co.,

I'm not a defender of any political agenda here, but I would like to 
correct the general assumption, as evident in the interviews last night, 
that the Galileo system is more accurate than the GPS system. The GPS L1 
signal available to the general public has a nominal accuracy (PDoP) of 
30 meters; however, with the L2 signal and P code with capable receiver, 
it has a nominal PDoP of one meter, comparable to Galileo. The P code is 
available only to the USA military at present. I would assume once 
Galileo reaches operational status there is no need to keep the P code 

Folks might forget the Russian GLONASS system, which is very similar to 
GPS and Galileo, has been around for over twenty years. It is not clear 
how long it will last or whether it can be maintained to the order of 
GPS and Galileo.


Danny Mayer wrote:
> Giove-A has been successfully launched and is a precursor to the full
> Galileo satellite navigation system. Its payload include two rubidium
> atomic clocks.
> http://news.bbc.co.uk/2/hi/science/nature/4555298.stm
> Danny
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