[SystemSafety] GPS jamming

Dewi Daniels dewi.daniels at software-safety.com
Fri Jul 12 11:25:27 CEST 2019

I'm puzzled. I thought the whole point of WAAS (and EGNOS) was that the
pilot would be alerted if the GPS calculated position is inaccurate. See
section 1.7.2 of
https://www.gps.gov/technical/ps/2008-WAAS-performance-standard.pdf . Why
was the pilot not alerted in this instance? Was he not using a WAAS
receiver? If not, why was he relying on a vanilla GPS receiver for


Dewi Daniels | Director | Software Safety Limited

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On Wed, 10 Jul 2019 at 12:49, Robert P. Schaefer <rps at mit.edu> wrote:

> Thought this would be of interest:
> NASA report: Passenger aircraft nearly crashes due GPS disruption
> https://www.gpsworld.com/nasa-report-passenger-aircraft-nearly-crashes-due-gps-disruption/
> Along the lines of “Who the heck would jam GPS in the continental US?”,
> I’ve got an anecdotal story from one of Haystack’s scientists who was
> trying to collect GPS data
> (L1, L2 data is useful for measuring solar activity in the Ionosphere)
> during the solar eclipse in August 2017.
> He was unable to collect data because of GPS jamming. The story was that
> truckers use GPS jammers so they
> won’t be tracked by their employers.
> bob s.
> research engineer
> MIT haystack observatory
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