[time-nuts] Possible GPS Interference test

[Mike Millen]

Would this sunspot activity have anything to do with it?

http://spaceweather.com/

Mike


On 30/09/2015 18:18, Tim Shoppa wrote:
> I went ahead and did the math based on some of your numbers. I was a little
> unclear on which numbers to use.
>
> -2E-10 in frequency over 5 minutes, is -60ns. 60ns is not completely
> unreasonable for an ionospheric delay variation over hours, but I think it
> would be unusual for there to be so much tumult in just 5 minutes though.
> (Especially when geophysical K index has been particularly calm lately.)
>
> On the other hand, -2E-10 over 3 hours, is -2 microseconds which is just
> huge!
>
> Do you have anything like a graph of phase difference or EFC over those 3
> hours?
>
> Tim N3QE
>
> On Wed, Sep 30, 2015 at 1:54 AM, James Flynn <james.flynn at csun.edu> wrote:
>
>> I recorded apparent anomalous activity on the GPS signal received near Los
>> Angeles from about 0200Z to 0500Z 30 Sept. The 1PPS received signal
>> shifted by -2E-10 in frequency (5 minute averages).
>>
>> There is a notice on the GPS website about possible interference today (29
>> Sept) through 30 Sept in the area of 253 nm around China Lake, CA. (which
>> includes Los Angeles)
>>
>> Anyone else near LA notice anything?
>>