GPS spoofing

[ASCTU744]

https://nos.nl/artikel/2512977-valse-gps-signalen-misleiden-passagiersvliegtuigen-boven-midden-oosten

"GPS spoofing can continue to have consequences for the systems on board even though you have long since flown out of the disturbed area. As a result, pilots cannot fully rely on the data provided by their systems during the entire flight," says VNV vice-chairman George. "There are stories that after GPS spoofing in the Middle East, pilots received incorrect messages from their systems when landing in Tokyo."

Apparently GPS spoofing still has effect on the systems even after leaving the "spoofing-area". I can't see how, as soon as the area is left and a legitimate gps signal is picked up the systems wlll only follow the most recent signal right?

Systems I can think of right now that may be affected by spoofing:
-EGPWS
-FMS
-ACARS?

[boeing747430]

Quite often the GPS receivers will not recover and start working again properly after a flight through a jamming or spoofing area. Don't know why, it's just the way it is. Only a full reset by pulling circuit breakers will help - but only if procedures allow.

On 747s, it could screw up the whole  multi mode receiver and even leave you without an ILS-receiver on that particular MMR.

[B767300]

Quite often the GPS receivers will not recover and start working again properly after a flight through a jamming or spoofing area. Don't know why, it's just the way it is. Only a full reset by pulling circuit breakers will help - but only if procedures allow.

On 747s, it could screw up the whole  multi mode receiver and even leave you without an ILS-receiver on that particular MMR.

Maybe some kind of memory compare function, that fails when the current GPS position differs too much from the most recent position (GPS going from south-Yemen to Angola within 3 sec). Maybe if such a function (should it exist) fails, parts of other systems are deemed unreliable and thus fail too.

Just taking a guess...

[United744]

There could be more to it as well...GPS receivers are receiving data packets; not simple radio frequencies. Spoofing/jamming could be exploiting/crashing the receivers as well, which could also prevent them recovering.

People think it is just messing with position, but of course, these are military systems...