Dear Kurt,
Thank you for your answer and very interesting information on these unmanned platforms. But what if the system gets hacked and tampered with like the RQ-170 Sentinel that went down over in Iran?
Dear Equation and Obi Wan Russell,
it has been rumoured among the 9/11 conspiracy theories that you could actually remote control passenger aircrafts (makes sense to deny hijackers critical abilities to decide and makes sense because none claims the 9/11 eleven hijackers could fly as good after known training as the visible performance on that day). So let's postulate there's such a link, how would you configure it?
Gripen is quite renown for its hard to detect or jam short range laser communication that enhances their multirole capabilities through networking individual information. I think that would be one way to go, short range communication for communicating drones with a manned system as unreplaceable transmission intermediate to block any hacks. In a sense these UAV are then cheap weapon load multipliers for a combat aircraft with good fighter characteristics.
The other idea would be a platform that can autopilot and receives orders via a pre-set individual one-time pad encryption. You can't break into this system, it's been proven impossible to decode if used properly (don't use your favorite book as encryption key for example).
Being able to hack a drone is a sign of sloppy encryption standards and not a vulnerability of unmanned systems per se. They're rather vulnerable to jamming, although you'll have a hard time jamming a frequency hopping communication. The remaining problem is spotting the communication, you can pretty much fly it with a large banner "US drone attacking your home" if you don't use directed low energy communication that best works over short distances (or gets too expensive for the intended cheap UAV).
So I would have very high altitude, but not expensive space, platforms with a wide horizon as intermediary to direct drone operations near ground. Multiple platforms help to constantly shut off communication and change localization. This problem is similar to operating modern artillery, as soon as you send your enemy a visible heavy message, he soon knows where you are. Above the intermediary aircrafts (or blimps?) I would position satellites in order to broadcast the information down without giving away precise locations through directed communication beams. Yes, the enemy will hear every command for every drone, but with good encryption he won't figure out a thing nor will he be able to use traffic statistics to interpret your moves if you run enough misinformation chat (see Operation Fortitude).
Multiple satellites are necessary because all communication sources can again be located and location means destruction, so keep silent from time to time and move unpredictable. Now why the intermediate high altitude layer in the atmosphere, why not direct orders? If you want to give the operator of the drone information of the whereabouts of the drone you need detectable signals to run all the way back. I consider it economic to have the drones use directed short range communication with little energy to a more long range platform that communicates things to the satellites with directed higher energy output (detectable over a large area). Because earth is quite round, the higher up you go, the more space there is, so proportionally detectors have less chances or grow to visible sizes and they have little cover up there. There's no stealth there because you fly with space radiaton on your back, so either you aren't there or you're black spot in a sea of light. However it's vast area to search as long as you don't try to stalk an enemy asset, because the enemy is sure to know the whereabouts of his assets and search the surrounding space (same problem with naval surface warfare, the ocean is a vast place to look despite ships being not small, now imagine more space and smaller objects).
Before I sound too much like flying my drone everyday, I'm just a little tech savvy geek, not the chief engineer of Lockhead, so these guys might easily have better ideas than me.