Engineering

How a drone can soar without using GPS

Drones use GPS to find their way without a pilot. But GPS signals can be easily blocked by tall skyscrapers or trees—leaving drones lost.

Engineering

Swarms of autonomous aerial vehicles test new dogfighting skills

Aerial dogfighting began more than a century ago in the skies over Europe with propeller-driven fighter aircraft carried aloft on wings of fabric and wood. An event held recently in southern California could mark the beginning ...