It is worth noting that there are two different ways to attack GPS: jamming and spoofing. Jamming is when you broadcast a noise signal at the GPS frequency, which prevents affected receivers from receiving the GPS signal. The result is that the GPS doesn't know where it is. Spoofing is when you send out a fake GPS signal that appears genuine but has the wrong timing. The result is that the GPS thinks it knows where it is, but it's wrong. Spoofing is more difficult -- and far more serious -- than jamming. What is reported here appears to be (an attempt at) jamming, but spoofing attacks have also been reported in the past.
https://www.schneier.com/blog/archives/2017/09/gps_spoofing_...