6 ms·

Or maybe the European team simply agreed with the concern?

• madez 10y ago
  Now, that is a valid concern. So far the first I read. Maybe some countries in Europe also wanted to see Snowden catched.
  • dogma1138 10y ago
    You do understand that the security concerns of Europe and the US are mostly overlapping right?
    • madez 10y ago
      Exactly, mostly. I think Europe should have efficient and effective measures to ensure it's safety also when they don't align.
• dmichulke 10y ago
  Would there be a reason why GPS with 10m accuracy is OK but Galileo with 1m is not?
  • nickpsecurity 10y ago
    GPS has better than 10m accuracy in another operating mode. Only the military is allowed to use that one, though. Then they don't want Galileo being 1m accurate? Probably same military reasons.
    • wcoenen 10y ago
      > GPS has better than 10m accuracy in another operating mode. Only the military is allowed to use that one, though. This has not been true since May 2000, when GPS "Selective Availability" was turned off. Civilian and military receivers have the same accuracy now. http://www.gps.gov/systems/gps/modernization/sa/ http://www.gps.gov/systems/gps/modernization/sa/
      • nickpsecurity 10y ago
        I didnt know about that. Thanks for thd tip. So, the civilian GPS devices have the PPS signal and accuracy the military had?
      • DashRattlesnake 10y ago
        No, that's not true. The military has access to different codes and frequencies that aren't available for civilian use, which can be used to apply further corrections to the computed location. Selective Availability was not the only difference between civilian and military GPS. https://www.quora.com/Is-there-any-difference-between-military-GPS-data-and-civilians-in-terms-of-accuracy https://www.quora.com/Is-there-any-difference-between-milita...
        • nickpsecurity 10y ago
          Those extra frequencies were what I was thinking about. If they're still closed, then military still cripples GPS. The points of military vs civilian for this discussion would still apply.
        • wcoenen 10y ago
          As far as I understand, the remaining differences between military and civilian GPS don't matter much for accuracy. The military may still have the advantage of ionospheric correction, but civilians can use other augmentation systems like WAAS[1] with similar results. I think the military signals are mostly intended to protect against signal spoofing and jamming. [1] https://en.wikipedia.org/wiki/Wide_Area_Augmentation_System https://en.wikipedia.org/wiki/Wide_Area_Augmentation_System
          • nickpsecurity 10y ago
            Thanks for that link. Never heard of it. That's some mind-blowing tech and accuracy.
• espadrine 10y ago
  That is not the case. There was no valid concern. GPS is US military. They can block access to the civilian one for any reason. But if Galileo is on, they don't have the power to block it. Unless they jam its frequency. But as they use that same frequency, it would jam GPS. So, without officially giving a reason, they forced the EU to be on a different frequency. There is no concern with using the same frequency. The US simply wants, and got, the ability to jam Galileo. https://en.wikipedia.org/wiki/Galileo_(satellite_navigation)#Tension_with_the_United_States https://en.wikipedia.org/wiki/Galileo_(satellite_navigation)...
  • kec 10y ago
    Selective availability was disallowed by executive order in 2000. Block III satellites will not even have the capability to disable the civilian signal.
    • gaius 10y ago
      Block III satellites will not even have the capability to disable the civilian signal So we have been told, but it's just a firmware update (or equivalent).
    • monocasa 10y ago
      Anything disallowed by executive order can be allowed again by executive order.