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Most unmanned systems depend entirely or to a great degree upon GPS signals for location and navigation. Aerial systems, for example, fly too low to take advantage of the ground aviation beacon network.
The problem is that GPS signals are very weak and easy to disrupt. They have been disrupted by solar flares, malfunctioning electrical and electronic equipment, and poorly mounted TV antennas. Small illegal GPS jammers have become popular with privacy seekers and criminals, and U.S. adversaries are known to employ larger jammers that can deny GPS over very large areas. Drones losing their GPS signal because of reflection off buildings, other obscurations, or jamming is an increasing problem.
The RNT Foundation is working to safeguard GPS services by advocating policies and systems to Protect, Toughen, and Augment them.
Here are a few of the many resources we have available on GPS and drones: