[time-nuts] GPS outage?

[Bob Camp]

Hi

Ok, I'll also mention that I haven't heard of any major volcanic eruptions in the north eastern US. GPS outages would not make it on the news if there was a major Volcano doing it's thing outside Cleveland ….

If a sat went down, and did so in a pathogenic fashion, you would have an issue world wide. To keep the problem local, some sort of local jamming is about the only thing that could do it. To take out an area like New England all at once you would need a fairly high flying platform with a fairly powerful transmitter.

Bob

On Sep 5, 2013, at 2:29 AM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 09/05/2013 03:37 AM, Bob Camp wrote:
>> Hi
>> 
>> My guess is that if GPS was down over the northeastern part of the US for most of a day, you would not have to check with TimeNuts. It would be on the evening news. Since your typical mobile GPS needs more sats than a timing receiver, they should drop out first. When the entire car / truck / bus / ambulance driving population of a couple dozen states all gets lost at once - you'll hear about it…..
> Each bird "illuminate" about one third of the earth surface, so if about
> one third of the constellation would be off line it would have been a
> major event and seen over more than half the earth as a drop too. I see
> no strange notes in the GPS OPS Advisory, just the normal maintenance
> with nominally 32 birds on air.
> 
> There are ways by which GPS reception is disrupted, for instance by
> other transmitters. A few other causes like solare flares is said to
> cause it, and I think I've heard about issues around vulcanos.
> 
> Cheers,
> Magnus
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