Airway UM688 Iraq: Fake GPS signals causing nav failure over Iraq

[atakacs]

Originally Posted by kristofera

From a purely technical perspective, wouldn't retransmission of GPS signals with a high powered transmitter be able to achieve something like this? Low-powered retransmission of GPS signals is sometimes used to improve GPS coverage indoors, but if done with a high power transmitter that drowns out the signal from the satellites to nearby receivers, wouldn't that make other receivers think they are at the location and altitude of the retransmitted signals..?

Short answer yes but you have to "recompute" your output so that the receiver "sees" something (ie multiple satellites with a coherent signals) that will pass validation. Not trivial. I mostly wonder about the cost / benefit of this applied to commercial airliners overflying Iraq.