The technology that surveys our skies isn't designed to spot and identify everything that flies.
Satellites with keen enough eyes to pick out more modest aircraft, meanwhile, have a much tighter field of view and need to be precisely aimed at a specific target. They’re also few and far between.
Jonathan McDowell, a satellite tracker and researcher at the Harvard-Smithsonian Center For Astrophysics,that these spacecraft capture just a few percent of the Earth’s surface each day. The odds are not in the US government’s favor that any of its 143 UAP happened to pass right under one of those satellites just as they snapped a picture.Then there’s skyward-facing radar, developed during WWII precisely to identify flying objects before they have the chance to start dropping bombs.
Radar stations tend to be located mostly at airports, says MIT’s Weinert, where they keep a close eye on the surrounding airspace for obstacles that might pose a threat to passenger planes.Air traffic control also keeps tabs on flights beyond the immediate vicinity of the airport, but does so mainly through a process called “secondary surveillance radar,” or SSR. In SSR, an aircraft actively sends out a radio signal from an onboard transponder for radar stations to pick up.
Weinert has spent the last decade thinking about how to help the aviation world prepare for the growing popularity of drones and other small aircraft. Blanketing a region with instrumentation that can comprehensively detect “noncooperative” objects as small as drones is technologically possible. Upstate New York recently established what Weinert calls a “giant experimental playground” for testing drone operations and monitoring. But such surveillance would be pricey to scale up.
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