Critical infrastructure is about to get a second source

A monopoly on a single utility-grade signal is the kind of risk an economy discovers only when it breaks. Positioning, navigation, and timing, the PNT layer that quietly synchronizes financial trades, telecom handoffs, data-center clocks, and commercial flights, has run on GPS from medium Earth orbit for three decades. The cracks are no longer hypothetical.

Ars Technica's report on Xona Space Systems' first six production satellites, scheduled to launch in October 2026 with early service in 2027 and a full 258-satellite Pulsar constellation in the years after, marks the moment a commercial second source arrives on the buyer's side of the market. Not a government program: a vendor a CFO can sign.

What makes this a second source rather than a parallel one is altitude. Signals from low Earth orbit arrive roughly a hundred times stronger than GPS signals from medium Earth orbit, which is what lets the new constellation reach inside buildings, hold up under the GPS jamming disrupting commercial flights and maritime shipping, and carry an anti-spoof watermark the incumbent does not. Pulsar-0's live-sky jamming tests, Xona says, shrank a jammer's effective area by about 95 percent; software updates cut ranging error from 4.2 centimeters to 1.5. Vendor numbers, not yet validated at constellation scale, but the mechanism is the mechanism: lower orbit, stronger received signal, harder to jam.

The customers signing pilot contracts are the ones whose seconds cost the most: financial markets, telecoms, data centers, transportation. The FCC has granted Xona RNSS spectrum and opened a notice of inquiry on PNT complements to GPS. A credible second source of critical infrastructure does not replace the incumbent. It prices the single point of failure.