A stunning image of more than 15,000 airplane flights from around the world shows that satellite tracking of commercial aircraft is moving closer to reality.
The problem with tracking airplanes by ground-based radar is made tragically clear every time planes vanish. When a plane flies over remote regions or vast oceans, the aircraft may disappear from the radar tracking system. In March 2014, Malaysia Airlines Flight 370 disappeared from radar over the Gulf of Thailand and its whereabouts remain unknown.
The National Transportation and Safety Board recommended a solution in a January report: real-time satellite tracking. Private companies already sell transmitters that can send signals from planes to satellites every minute. In the United States, the NextGen (Next Generation Air Transportation System) satellite-based tracking system is scheduled for a full rollout by 2025. [The 5 Real Hazards of Air Travel]
Now, using signals from an experimental Automatic Dependent Surveillance–Broadcast (ADS-B) transmitter, the European Space Agency (ESA) has tracked more than 15,000 aircraft over two years with a minisatellite, the agency said in a statement. The satellite picked up more than 25 million positions from the planes, the ESA said.
"We've shown that detection of aircraft can work from space with no showstoppers, despite the fact that these signals were never designed to be picked up from so far away," Toni Delovski of the DLR German Aerospace Center said in the statement.
The satellite flight patterns reveal where to find peace and quiet from screaming jet engines: the Sahara, the Himalayas, Madagascar, Alaska's Brooks Range and, perhaps, a bare patch of Nevada desert (presumably the system isn't tracking military jets, which often buzz this corner of the Southwest).
ADS-B signals are part of a new satellite tracking system that is being phased in worldwide for the commercial aviation industry. The technology will both send and receive broadcasts from aircraft, giving flight information such as speed, position and altitude. The equipment could replace secondary radar and help improve safety by providing more accurate positions and better surveillance.
Primary radar determines a plane's position by bouncing signals off the aircraft. Secondary radar uses a transponder to send location information directly from the plane.
The ESA flight-tracking experiment was a proof-of-concept study that tagged along on the Proba-V minisatellite. The minisatellite, measuring less than 35 cubic feet (1 cubic meter), was launched in 2013 to chart global vegetation changes.