A Syracuse startup has developed a system that detects small, low-flying drones that radars can’t see. Without the ability to detect drones, air traffic controllers have no real way of managing the skies to prevent potential collisions between drones and manned aircraft, and security personnel would have no way to detect drones flying over sensitive facilities or public events crowded with people. Hidden Level uses sophisticated sensors that can detect drones flying over wide areas. According to the company’s website, just 10 of its sensors can detect drones over a 170-square-mile area, enough to cover the entire city of Atlanta, including Hartsfield-Jackson Airport.