[time-nuts] Recommendations for Mains Power Monitor / Logger
David G. McGaw
david.g.mcgaw at dartmouth.edu
Tue Mar 13 15:08:44 EDT 2018
I expect 1/R^2 would prevent such a scheme from working as the
terrestrial transmitters would vary widely in signal strength in a way
that GPS satellites do not and could overload the receiver.
David N1HAC
On 3/12/18 9:54 AM, Peter Reilley wrote:
> Reading this paper makes one wonder if there are other improvements that
> can be made to increase the robustness against jamming, software bugs,
> solar events
> or hostile attacks to the GPS system
>
> A suggestion:
>
> Create a parallel terrestrial GPS system. This would be a system of
> GPS transmitters
> mounted on cell phone towers. They would masquerade as GPS
> satellites (but unusually low
> and stationary). It would be ideal if they could have unique
> identifiers and be integrated
> into the GPS receivers timing and location calculations as any other
> satellite. If there
> is no room in the existing ID space then the terrestrial node would
> take over the ID of
> a satellite that is below the horizon. When the satellite reappeared
> the terrestrial node
> would simply take over a different below the horizon satellite's ID.
>
> Such a system could be built out as needed. It may not require any
> alterations to existing
> GPS receivers. It would not disrupt the operation of the existing
> satellite constellation.
> It would protect against attacks on the satellite system by either a
> human enemy or a natural
> one, the sun.
>
> Each node need not contain an accurate time source like a cesium
> standard. They could
> derive timing from a neighbor. Cesium reference nodes would be
> periodically placed around the
> system. Timing derivations would be more accurate since the
> distances would be much closer and
> thereby encounter less environmental disturbance.
>
> GPSDO units would prefer such close and stationary references vs
> distant moving ones.
>
> Pete.
>
> On 3/11/2018 5:26 PM, Magnus Danielson wrote:
>> Hi Andy,
>>
>> On 03/11/2018 08:40 PM, Andy Backus wrote:
>>> Thank you for your posting, Magnus.
>>>
>>> Your information is very interesting.
>>>
>>> Do you mind saying a little more about the "incident" on
>>> 26-JAN-2016? I don't find reference to it in the link. And my own
>>> TE plot for then shows no obvious disturbance.
>>>
>>> Thanks.
>> Please read this:
>> https://na01.safelinks.protection.outlook.com/?url=https:%2F%2Frubidium.dyndns.org%2F~magnus%2Fpapers%2FGPSincidentA6.pdf&data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Ca4a010b972b74eba0aa208d5890f2665%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C636565620521190534&sdata=DvYknd%2F9wuMeyr0DaSNwdZPuPunA8I8XBmSp1nXnm38%3D&reserved=0
>>
>>
>> In short, the GPS to UTC time correction polynomial got screwed up.
>>
>> I got email from NASA, ended up having to call NASA HQ and got invited
>> to Washington DC to present before the US PNT advisory board.
>>
>> Among the stranger things I've done in my life, but it was fun.
>>
>> Cheers,
>> Magnus
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>
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