July 31, 2012      

With unmanned aerial vehicles (UAVs) taking to the skies in unprecedented numbers, aircraft survivability is a growing concern. "See and be seen" has long been a fundamental principal of air traffic control, but on pilotless aircraft some form of technology is essential for ensuring collision-free flying.

On many UAVs, radar is used to continuously check the skies for potential dangers. Yet this approach has a serious drawback that limits its effectiveness in today's increasingly crowded airspa...

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