Iranian TV Shows Downed US Drone

First time accepted submitter loic_2003 writes "Iranian TV has broadcast footage of an advanced U.S. drone aircraft that Tehran says it brought down using electronic methods to override its controls. The BBC's James Reynolds watched the footage and said the fact that the drone appeared undamaged provided some evidence to support Tehran's version of events. The film was captioned 'RQ170 — advanced U.S. spy plane' and carried on the Vision of the Islamic Republic of Iran Network 1 channel."

Comments

Undamaged Replica?

[j-stroy]

Despite extensive covering on the underside, to me it looks TOO fresh and undamaged. It doesn't look used at all

I think this is a mold reproduction of whatever they did get, faired out the damaged areas, swapped over a few parts and the paint is is still wet. There is nothing underneath it, its just a surface shell that looks right.

Re:Undamaged?

[elrous0]

Just like the CIA changed its story, you mean? "Drone, what drone?" to "It's possible we've lost one in Afghanistan, but no one took it down" to "Yeah, it's probably ours. But it didn't enter their airspace" to "Well, it might have strayed accidentally into their airspace." At some point in the future, when all is said and declassified, I'm sure we'll learn it was on a spy mission in the middle of Iran.

Re:Anyone else not surprised?

[v1]

All you need is a simple jammer that broadcasts over the entire spectrum that the enemy is using.

There's a lot more to jamming than that. Unless your transmitter is absurdly more powerful than the one you're trying to jam out, spread spectrum transmissions can be extremely difficult to jam. The receiver is looking for (simplified here) modulation in a signal pattern. If you know the exact pattern you are looking for, you can very effectively filter out the noise. Then you just demodulate the signal to get your information out clean.

So when brute force isn't going to cut it, you have to really know what you're trying to jam, and more than likely you are going to have to be able to adapt, because critical control systems like this will have multiple fail-over procedures in place to automatically hop to a different band, modulation, whatever they care to mix up to render your jamming ineffective.

Providing a very simple example of why brute force doesn't work: get a whistle, and some really loud speakers and stereo. Have a friend stand by the speaker, occasionally blowing the whistle (maybe in a coded pattern that provides you with information), while the stereo cranks out the sound at ear-splitting levels. Standing 300 feet away, can you hear when the whistle blows? No you can't, the music is jamming you. Now get out a little handheld mic with headphones, and $15 in radio shack hardware for making a notch filter, tuned to the frequency of the whistle. Listen to that. You may hear a very faint trace of the music, but the whistle will be loud and clear every time its blown. Jamming is overcome. Doesn't really matter if you crank up the volume on the music either. Now what if the music happens to hit the note of the whistle and plays a solid or repeating tone at that frequency? So you start hearing that and can't tell when its the whistle or the music. Now your friend can see you waving your arms around indicating you can't hear him, so he puts that whistle in his pocket and takes out a different whistle. You flip a switch on your gear to switch the notch frequency for the next whistle. Now you're back in business. That's how jamming works, brute force often is ineffective.

Re:Doh

[Forty Two Tenfold]

Never believe anything in politics until it has been officially denied.

— Otto von Bismarck

Re:Doh

[capnkr]

Remember this story from back in October?

Exclusive: Computer Virus Hits U.S. Drone Fleet

Ever since I read Iran claimed they didn't shoot it down, I've been wondering if or how much that virus and this "cyber warfare" attack might be connected...