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…
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GPS III, first launched in 2018, delivers three times the accuracy and eight times the anti-jamming performance of previous GPS generations, with a GPS III satellite named Katherine Johnson launched by SpaceX in 2025. GPS modernization includes the L1C common civil signal for interoperability with Galileo and a Next Generation OCX ground system to handle…
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