Posted on 07/13/2006 8:19:37 AM PDT by Magnum44
US Cracks Europe GPS Satellite Codes
Brussels (UPI) Jul 11, 2006
U.S. scientists have reportedly cracked the European Union's secret satellite navigation codes. The codes, to be used by the EU's Galileo satellite system, casts doubt the $4.2 billion project will pay for itself through commercial fees, The London Telegraph reported Tuesday. Cornell University Professor Mark Psiaki said he and colleagues cracked the coded data being beamed to Earth by a prototype orbiting satellite.
That, The Telegraph said, is potentially devastating for the EU, which wants to charge high-tech firms license fees to access that data, before they can make and sell compatible navigation devices to the public.
Galileo is to be a European rival to the United States' military-controlled GPS system, which supplies signals without charge. Galileo's designers, however, say it will be more accurate than GPS.
The European Commission said Monday Cornell's success in cracking codes for the prototype is irrelevant, since the final Galileo codes will be different.
Galileo, due to be operational by 2010, is a joint venture of the European Commission, the European Space Agency and private investors, including an arm of the Chinese government.
Source: United Press International
Was it one of those handheld units?
Then why do you need GPS???? Just whip out your sextant and HO229!!! Or you could buy this: Analog GPS
Wow, I haven't touch one of those since youngster year at USNA. Memories....
That's just a cheap receiver, the ones sold for aircraft are accurate to within 20' at 600 knots, and thats at the very northern latitudes.
As far as the euroweines, let them get the new system in operation and our military can take off the accuracy blocking and bsnkrupt them.
Was it one of those handheld units?
Digit-all sex?
"I am here to tell you that a GPS has saved my marriage."
I think he means about driving without asking for directions..
"I am here to tell you that a GPS has saved my marriage."
I think he means about driving without asking for directions..
L O L
Short story is that the variance (~square of the standard deviation) of independent measurements goes like resistors in parallel, hence this formula for combined error:
Combined_Error = sqrt(Error_1*Error_2/(Error_1+Error_2))
If both systems have the same standard error, you reduce the standard error by a factor or 0.707 (sqrt(.5)). Try it. If one error is much greater than the other, the reduction is much smaller, in the limit no effective reduction in error than simply taking the system with lower standard error. While four satellites are sufficient for a solution it is not uncommon for receivers to combine up to six satellites in a least squares solution.
In practice little is gained by using more than four satellites, since GPS error is dominated by geometry, the "DOP", dilution of precision, (a misnomer) depends more on the viewing geometry, how the errors in delay from separate satellites combine geometrically. Recievers using the best four GPS satellites perform about as well as those using six. Some receivers say they "track" upto 12 satellites, but this is at best the capacity for code tracking. More than eight satellites are rarely in view at once, and more satellites from the same constellation don't really buy you much.
I think he means about driving without asking for directions..
You're kidding me, you're kidding me, but I know that I'm repeating myself, repeating myself.
We have a 276c called Betty (as in Bitching Betty). Any pilot will know why
Did Airbus build their GPS?
Because I'm not on the bridge 24 hours a day. :)
And celestial nav is pretty much relegated to a hobby nowadays.
It has this do-dad (pardon the technical term) that mounts it onto the windshield with a suction cup. That is the only down side, it does fall off every once in a while. I've minimized that by having the do-dad rest on the dash. I guess that takes some of the stress off the suction cup.
Another cool function is if you miss your turn it will either turn you around or reroute you. It is very cool.
Being on FR at 11:00pm doesn't do our marriages any good either.
Hah!
dung.
I use my laptop with GPS so I haven't seen one of those up close, but I really think that is a "whats a ma jig"
But what you don't realize it's 8:00 am here in Germany.... ;-)
Well, I never said I'm an engineer, but I am handy with duct tape.
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