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The U.S. Army announced that it has completed a two-week test of its Ground-Based Sense and Avoid system, which will allow drones and unmanned aircraft to fly more safely in domestic airspace. The system will allow for safer flights with less manpower and oversight, though it doesn't address the concerns citizens might still have regarding UAVs in their neighborhoods.
Drones have been on the fast track at the FAA ever since their latest budget arrived with language suggesting they get moving on legalizing them. Police, national guard, scientists, everyone wants a drone, and while caution is a virtue at the FAA, sometimes things need to be expedited. Late 2015 is the hard limit on having regulations in place, and so the FAA is working with drone makers and operators to set down, for lack of a better term, some ground rules.
Part of those rules is a "sense and avoid" system, with which an unmanned aircraft can detect other craft in the same airspace and make the appropriate adjustments to its flight path. Today, that often means a chase aircraft with a human observer, but low visibility or darkness can put an end to that. Ideally, the craft itself would house instruments capable of scanning the area, but ground-based systems can be more comprehensive and more reliable, though they are less portable.