Russia’s Cosmos 2546 traced to GPS jamming

Somewhere above you, roughly 36,000 kilometers up, a Russian military satellite fires a pulse of radio energy toward Earth. It lasts less than five seconds. Your phone's map hiccups and recovers. A pilot near Warsaw sees a brief warning on the cockpit display, then the signal returns. A cargo ship in the Baltic stutters on autopilot for a moment.

These invisible pulses have been washing over Europe since October 2019. Until last week, no one could prove where they originated. Researchers have now traced them to specific Russian military satellites, exposing a form of orbital GPS jamming that European security institutions never publicly acknowledged.

Triangulating lightning from space

The study, "Chasing Lightning," analyzed seven years of data from 165 GPS reference stations operated by the International GNSS Service and archived by NASA. The team, led by Todd Humphreys at the University of Texas, found 75 distinct days of sudden, synchronous GPS signal drops across stations from Svalbard to Spain to Greenland. Each event lasted three to five seconds.

That simultaneity is the key. No ground transmitter, not even Russia's 36-antenna installation in Kaliningrad, can blanket that much geography at once. The source had to be in space.

The proof arrived in February 2026, when two highly sensitive tracking stations in Amsterdam and Trondheim captured the same pulse. It reached Norway 139 microseconds earlier. Think of it like hearing thunder from two locations and triangulating where lightning struck. That timing difference defines a surface in space where the source must sit. Checked against every tracked satellite in orbit, only one matched: Cosmos 2546, a Russian military early-warning satellite (arXiv:2606.03673, Boston Globe). The alignment was precise to 200 meters. Spain's GMV, the principal ESA contractor for Galileo, ran a separate investigation and reached the same conclusion.

A signal with a schedule

The interference peaks at 1,577.5 MHz, close to the civilian GPS frequency, with enough power to suppress GPS, Galileo, and China's BeiDou simultaneously while leaving Russia's own GLONASS untouched. Events cluster on weekdays during European business hours. Random malfunction doesn't keep a calendar.

The study is a preprint, not yet peer-reviewed, and the researchers acknowledge they cannot confirm intent. But the first recorded event occurred in October 2019, one month after Russia's first operational EKS satellite reached orbit. EKS is Russia's missile-detection early-warning network, and the timing is difficult to explain away.

Two layers of a single problem

While European attention has focused on continuous ground-based interference from Kaliningrad, which redirects drones and disrupts shipping for hours at a time, the orbital pulses represent something different and harder to counter. On June 5, a Ukrainian maritime drone lost contact with its operators and self-destructed inside Romania's Constanța port after prolonged GPS interference. Open-source monitoring platforms measured interference at 200% of baseline over preceding hours. That kind of sustained disruption comes from ground transmitters.

The five-second satellite pulses don't crash drones. They do something subtler: they erode the reliability of navigation across an entire continent simultaneously. EUROCONTROL data from August 2024 showed roughly 1,500 flights per day experiencing GPS disruption. Finland alone reported 1,200 incidents in a single year, up from 239 the year before. Aircraft survive because pilots can fall back on inertial navigation. But steady, unprovable degradation undermines trust in systems that underpin timing, logistics, and modern transport.

Nine years without a shield

Europe's primary countermeasure, Galileo's OSNMA authentication protocol, went live in July 2025. It verifies that a navigation signal comes from a genuine satellite rather than a ground-based faker. OSNMA cannot help here because it defends against spoofing (fake signals), not jamming (signal suppression).

The actual fix is Céleste, a planned low-orbit constellation transmitting stronger signals harder to overwhelm. ESA launched two demonstrators in March 2026, which sent their first navigation signal on April 8. The operational constellation is expected around 2035.

That leaves a nine-year window with no effective defense against orbital jamming. The UK and France are deploying eLoran, a high-power terrestrial backup resistant to space-based interference, but the rest of the continent has no firm timeline. Russia, asked about the allegations, has demanded Europe "present at least some evidence." The researchers just did. What matters now is whether Europe treats this as a research curiosity or an infrastructure emergency.