A New Method to Protect Aircraft Against GPS Outages: Researchers are testing a new backup system to keep an airplane on course when it cannot rely on global positioning system satellites.

The article focuses on a new backup navigation system being developed by Sandia National Laboratories and Ohio State University to protect aircraft from Global Positioning System (GPS) outages. Topics include using signals of opportunity for positioning, addressing GPS jamming and spoofing threats, and testing high-altitude payloads with antennas to validate alternative navigation methods.