Re: [Discuss-gnuradio] Galileo (EuroGPS) cracked

[Brent M. Ledvina]

Cracking the code actually wasn't that hard to do. The part that was
challenging for the Cornell group is that they used a simple
omni-directional patch antenna, as opposed to a high-gain dish antenna.
When you use the latter, codeless/semi-codeless acquisition is easier
because the interfering GPS and SBAS signals are essentially eliminated.

There is actually at least one other group that did this out of
Germany, at about the same time. They, however, used the easier
approach.

Regards,
Brent

On 7/19/06, Ben Loftin <address@hidden> wrote:

>That means free access for consumers who use navigation devices
> -- including handheld receivers and systems installed in vehicles --
> that need PRNs to listen to satellites.

Ah no!

(1) The non-free codes will be encrypted (L1P, E6C, E6P) when the 'commerical'
codes are officially online so you will need the key similar to US military P
codes
     -  There will be a government encryption on L1P and E6P and commerical
encryption on E6C

http://www.galileoju.com/doc/Galileo%20standardisation%20document%20for%203GPP.pdf



(2) From the 'cracker's' website, http://gps.ece.cornell.edu/galileo/ the actual
usefullness is brought into question at the end of their 'report':

"Subsequently, the Cornell project team has learned that whereas the GIOVE-A
power spectrum is meant to be representative of the final Galileo signal power
spectrum, the GIOVE-A codes and navigation message were not meant to be the
same as the final Galileo codes and navigation message."

Still cool they were able to do it, must have been a slow summer :)

Ben


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