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Due to GPS' fragility and exposure to enemy attacks on satellites, the Air Force seeks proposals for AI-based systems that would rely on the Earth's magnetic field.https://www.defenseone.com/technology/2020/07/air-forces-latest-gps-alternative-earths-magnetic-fields/167387/ …
Here's a link to the "Signal Enhancement for Magnetic Navigation Challenge Problem" on GitHub:https://github.com/MIT-AI-Accelerator/MagNav.jl#readme …
