[time-nuts] GPS vulnerability and e-Loran

[Tom Van Baak]

 > back when Woodford and Nakamura wrote their system engineering report.

For those of you wondering about Jim's comment, start with this article:

https://www.xyht.com/gnsslocation-tech/aerospace-corps-role-development-gps/

and then grab a copy of the then-confidential report from 1966:

http://www.xyht.com/wp-content/uploads/2016/07/3-5-redacted-TOR-10012525-17-1-Briefing-navigation-satellite-study_Redacted.pdf

Fun reading if you're into the history of clocks & navigation. Warning: 
the rabbit hole is very deep.

/tvb


On 11/29/2019 2:05 PM, jimlux wrote:
> On 11/29/19 11:54 AM, Martin VE3OAT wrote:
>> A nice "general reader" article about GPS vulnerabilities to jamming 
>> and spoofing and the expected consequences, with a too-brief mention 
>> of e-Loran, appears in the current issue of Scientific American ("GPS 
>> Down", December 2019, pp 38-45).  Says e-Loran is unfunded and no one 
>> is doing anything about it.  (What else is new?)
>>
>
> Any "over the air" nav system has an inherent vulnerability to jamming 
> and/or spoofing, especially a one-way system like GPS or Loran or Omega.
>
> With improved constellation on board processing bandwidth, the need 
> for a one way system is less important than it was back when Woodford 
> and Nakamura wrote their system engineering report. Two way nav is 
> tougher to spoof (assuming you have a good clock), and, depending on 
> the system, tougher to jam.
>
> A good clock, accelerometers, gyros, and celestial nav is tough to jam.
>
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