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GCN : August 2013
EMERGING TECH SENSOR SYSTEMS GCN AUGUST 2013 • GCN.COM 19 White Salmon, Wash., developed one that weighed only 3.5 ounces. Last November, ING Robotic Avia- tion equipped one if its 22-pound Seren- ity UAVs and manned Harvard Mark IV, a fixed-wing, single-engine aircraft oper- ated by Canada's National Research Coun- cil, with Sagetech ADS-B transponders and Clarity receivers. The two aircraft were then flown for 90 minutes above an Ottawa air park. "We were able to prove that we could fly, and they could see us a long way away," said Glenn. "We were able to pick up [data on] traffic coming to Ot- tawa even as it was crossing New York's border." Even better, he said, the Clarity re- ceiver is independently powered, which means that even older aircraft can adopt the technology. "One of the arguments by regulating agencies is, 'Well, that's great, but we have people flying Sopwith Cam- els. They don't even have power supplies, and they don't have a radio,'" said Glenn. "Well, here's a little box that you can stick on the dashboard, with a battery that will last longer than your bladder. And it has its own little Wi-Fi and it'll display on an iPad." ONE SYSTEM FOR ALL SIZES Until all aircraft are equipped with ADS-B transponders and receivers, of course, UAV sense-and-avoid systems must rely on other technologies to detect other aircraft and to undertake evasive maneuvers. One of the most ambitious civilian ef- THE COLLISION AVOIDANCE (CA) TIMELINE In a collision avoidance situation, the pilot takes into account the proposed maneuver, then approves or overrides it. CA ALERT AUTOMATIC CA THRESHOLD CA MANEUVER COMPLETED Once this threshold is reached, automatic maneuver is engaged at maximum UAV maneuvering capabilities. The MIDCAS project is developing sensors and processing modules to detect potential collisions and execute avoidance maneuvers between manned and unmanned aircraft. UNMANNED AERIAL VEHICLE (UAV) CLOSEST POINT OF APPROACH (CPA) UAV FLIGHT PATH MANNED AIRCRAFT FLIGHT PATH