[time-nuts] GPS outage?

[Chris Albertson]

Another scenario that would result in many reports from an area like
New England is if only about a dozen people happened to be affected by
one truck that was carrying a jammer.  These dozen people would
complain and from those few complaints you'd say "we have a dozen
reports from all over New England of GPS outage."   I suspect this is
the kind of thing that happened.

Each satellite serves the entire Earth so a system failure would be
global, not regional.  I suspect the problem is that the data were
collected from people who self-report a problem.   You only heard from
them and not the millions of others who had no problem.   A rather
extreme case of sample bias.   A better method is to pool random GPS
users and ask if their systems work.  This would be hard work but now
we have GPS inside cell phones so the polling can be automated.



On Thu, Sep 5, 2013 at 4:08 AM, Bob Camp <lists at rtty.us> wrote:
> 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.




-- 

Chris Albertson
Redondo Beach, California