Future Drones Will Autonomously Navigate the Skies Without GPS

Military drones rely heavily on GPS for navigation guidance while in the air. But in areas where a signal can't be found, or where someone is using a GPS jammer, a drone will find itself in a troublesome predicament. Military sub-contractor BAE Systems has come up with a solution to that problem: A positioning system… » 7/01/12 2:00pm 7/01/12 2:00pm