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    Re: Budgets
    From: Lu Abel
    Date: 2009 May 08, 15:33 -0700
    Anabasis wrote:
    On May 8, 12:26 pm, Lu Abel <lu...@abelhome.net> wrote:
    I hope, for many reasons, that the EU solves its difficulties with
    creating the Galileo system.   But as yet another space-based
    positioning system transmitting on the same frequencies as GPS, if
    nature (as opposed to a political act) takes GPS down, it will also take
    down Galileo.
    I think the greater risk is the political act, but you are right
    there.  The trouble is that some sort of ionic burst/solar flare from
    the sun that would lay to waste the GPS system would probably cause
    massive radio blackouts throughout the radio spectrum.  This would
    cripple any land based radio navigation as well.
    Solar flares will play hob with the ionosphere, hampering long-range radio communications, as well as increasing background noise and therefore reducing the signal-to-noise ratio of signals received from satellites.

    Loran runs on 100KHz groundwaves.   Solar activity would not affect this end of the spectrum, which is why the US Federal Radionavigation Plan touted eLoran as an alternative to GPS.

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