I looked far and wide, and there's nothing. However, inertial guidance is subject to drift, so if you spoof the GPS slow enough you can bypass inertial guidance

I looked far and wide, and there's nothing. However, inertial guidance is subject to drift, so if you spoof the GPS slow enough you can bypass inertial guidance as a protection. The most interesting part of the RQ-170 story however is how they managed to track it accurately enough for GPS spoofing to begin with - you need a track accurate to a few dozen meters to do that, and it's supposed to be super stealthy even beyond the stealthiest fighter jets making that impossible.