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

[Wilko Bulte]

Santa is testing his new SteSle[tm]? *)

Kidding aside, maybe it is an idea to see if the position reported by the various GPS starts to "wander"? I assume any spoofing/scrambling should be noticable too, apart from the SV plot that LH reports.
Maybe good GPS reject "implausible" SV locations from the location solution?

Wilko

*) Stealthy Sled

> On 16 Nov 2021, at 13:15, Dana Whitlow <k8yumdoober at gmail.com> wrote:
> 
> 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
>> 
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