[time-nuts] Re: GPS Elevation Mask Values.

[Dana Whitlow]

Dan, in recent years I've read that DOD (or some such agency) has been
running
spoofing tests here and there, but always in remote thinly-populated areas
(for
what should be obvious reasons).

As to why not all your receivers exhibit the "finger", I point out that the
appearance
of a GPS satellite "in the hole" must be treated as an exception, and
different
combinations of receiver HW & FW with different analysis & display  SW could
plausibly react differently to such exceptions.  I suppose such behavior
should
be called "bugs", but I would not be too harsh on the designers unless this
"bug"
also led to erroneous PVT output.

In any event, about all I can say is "What a grand mystery!".

Dana


On Mon, Nov 15, 2021 at 8:24 PM Dan Kemppainen <dan at irtelemetrics.com>
wrote:

> Hi,
>
> The adafruit board had a run with the LTE-LITE and Ublox. Adafruit board
> shows no birds above the north pole. Same as does the LTE-LITE on this
> run. Again, the Ublox shows them up there according to LH. (At least
> everything is consistent!) (The curious of you can view the attached plots)
>
> Currently running some logs of raw data from all three GPS modules.
> We'll give the logs 24 hours and run them through U-Center tomorrow.
>
> As for right now, eliminating the antenna and mounting location are the
> most important part. It's getting to be winter here, and snow makes
> getting to the antenna difficult/dangerous.
>
>
> Dana,
>
> I would be highly surprised if anyone were spoofing GPS here. We're
> pretty much in the middle of nowhere. Besides, why only Ublox modules
> giving the fits on LH?
>
>
> Keelan,
>
> Thus the confusion as to why there's birds above the north pole. This
> has happened on two PC's with Two different models of Ublox Modules. Two
> other brand modules seem OK on LH.
>
> Certainly odd.
>
> Thanks,
> Dan
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com -- To unsubscribe send
> an email to time-nuts-leave at lists.febo.com
> To unsubscribe, go to and follow the instructions there.