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Xona’s Pulsar constellation plans to deploy 250–300 small LEO satellites at about 326 miles (525 km) altitude to deliver centimeter-level PNT. Pulsar signals are encrypted and authenticated, with satellites orbiting ~40× closer to Earth than GPS to produce about 100× stronger received signals. A ‘cloud architecture for atomic clocks’ coordinates timing from ground stations instead of placing ultra-expensive clocks on every satellite, delivering nanosecond-level timing. Most existing GPS chipsets can access Pulsar signals with a firmware update, enabling rapid, near-term adoption. The system targets GPS vulnerability by defending against jamming and spoofing, branding Pulsar as an unhackable alternative. In June