I bet you could build a drone that flies off of a visual guidance system using IR beacons to locate itself. Something like a giant version of the Wii's sensor bar.

IR beacons have the downside of blatantly broadcasting their positions, but they might be less jammable than radio waves? OTOH, pointing an IR laser at your camera isn't that hard, so maybe not.

You could also take a page from the SR-71 and correct your inertial guidance system's error using star observations. Only needs to see up, so you can shield it against blinding attempts from below. Can a drone-weight camera pick up stars?