From
The Christian Science Monitor:
Iran guided the CIA's "lost" stealth drone to an intact landing inside hostile territory by exploiting a navigational weakness long-known to the US military, according to an Iranian engineer now working on the captured drone's systems inside Iran... the Iranian specialists then reconfigured the drone's GPS coordinates to make it land in Iran at what the drone thought was its actual home base in Afghanistan... "
The GPS navigation is the weakest point," the Iranian engineer told the Monitor, giving the most detailed description yet published of Iran's "electronic ambush" of the highly classified US drone. "By putting noise [jamming] on the communications, you force the bird into autopilot. This is where the bird loses its brain.".. The techniques were developed from reverse-engineering several less sophisticated American drones captured or shot down in recent years, the engineer says, and by taking advantage of weak, easily manipulated GPS signals, which calculate location and speed from multiple satellites...
US officials skeptical of Iran’s capabilities blame a malfunction, but so far can't explain how Iran acquired the drone intact. One American analyst ridiculed Iran’s capability, telling Defense News that the loss was “like dropping a Ferrari into an ox-cart technology culture.”.. A former senior Iranian official who asked not to be named said: "There are a lot of human resources in Iran.... Iran is not like Pakistan."..
According to a European intelligence source, Iran shocked Western intelligence agencies in a previously unreported incident that took place sometime in the past two years, when it managed to “blind” a CIA spy satellite by “aiming a laser burst quite accurately.”
More at the link, where the curtain around the drone in photos is explained as follows:
"If you look at the location where we made it land and the bird's home base, they both have [almost] the same altitude," says the Iranian engineer. "There was a problem [of a few meters] with the exact altitude so the bird's underbelly was damaged in landing; that's why it was covered in the broadcast footage."
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