According to Hackaday, GPS satellites orbiting about twenty thousand kilometers above Earth are vulnerable to jamming and spoofing—a weakness that has long been known but is now being exploited at large scale. Company Xona is testing a solution: Pulsar-zero, a low-Earth-orbit satellite that broadcasts positioning and timing signals roughly one hundred times stronger than traditional GPS. Operating much closer to Earth, Pulsar's signals are expected to be significantly more jamming-resistant, potentially providing backup navigation for systems that can't afford outages.

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