[SystemSafety] GPS jamming

Robert P. Schaefer rps at mit.edu
Fri Jul 19 16:12:54 CEST 2019

Surprise! it may have been a GPS receiver bug, and not jamming:


"A large number of operators have been affected this week by a software glitch in some Rockwell Collins GPS receivers. After a few days of head-scratching, the cause of the problem was tracked back to the receivers’ failure to compensate for the “leap second” event which happens once every 2.5 years when the US Government update their satellites – which they did on 9th June."

On Jul 10, 2019, at 7:49 AM, Robert P. Schaefer <rps at mit.edu<mailto:rps at mit.edu>> wrote:

Thought this would be of interest:

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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