For years, drivers, pilots, and ships across Europe have dealt with sudden, baffling GPS blackouts, leaving experts to guess whether the glitches were just bad space weather or a high-tech hack. Now, an unexpected study has pointed the finger at a surprising culprit, suggesting that the signals may actually be blocked by a network of Russian satellites lurking in orbit. The mystery began to unravel thanks to a strange, anonymous tip that told researchers exactly where to look, and what they found reveals an alleged, years-long space operation that highlights the growing suspicion of how easily our everyday technology can be targeted from above.
A surprising tip-off opens a long-running mystery
The investigation began with a cryptic message. In November 2024, Todd Humphreys, an aerospace engineering professor at the University of Texas at Austin, received an unusual tip-off. An anonymous source urged him to look at public data from global GPS monitoring stations during very specific dates in 2021.
At first, it seemed like a wild goose chase. These stations constantly track the signal strength of GPS satellites against background space noise. Because the data had been sitting out in the open for years, it seemed highly unlikely that a major anomaly had gone unnoticed.
Yet, when Humphreys and his students dug into the numbers, they found a startling pattern: brief, sharp drops in signal strength occurring at identical radio frequencies. A deeper dive revealed that this was no isolated glitch. The team uncovered 75 separate days where these mysterious drops rippled across the continent.
“This effect was being felt all the way across Europe, all the way to the north, to Svalbard, to the south, to Spain, all the way to Canada in the west, as far east as eastern Poland,” Humphreys explained in an interview with the science channel Veritasium. “And in fact, it had a distinct pattern across Europe to where it looked like the blast center was in Poland or Kaliningrad in that area.”
Why this wasn’t normal jamming
While localized GPS jamming — deliberately blocking or drowning out navigation signals — is relatively common in conflict zones on the ground, this particular phenomenon was entirely different.
The scale of the blackout ruled out a ground-based transmitter, as multiple satellites were being disrupted simultaneously over thousands of miles.
The researchers also quickly ruled out natural space weather, such as solar flares. When the Sun acts up, it blasts out a messy, wide range of radio frequencies. In contrast, this interference was highly precise —lasting less than 10 seconds and tuning exactly into 1,577.5 megahertz, the exact frequency where consumer GPS signals live.
A very human work schedule
Perhaps the most telling clue that nature wasn’t involved came down to the calendar. The Sun does not keep an office schedule, but whoever was behind these disruptions seemingly did.
“Notably, these [interference events] predominantly occurred during business days and business hours (UTC), which suggests human involvement,” the team noted in their research paper, pointing out a heavy concentration of incidents on Tuesdays, Wednesdays, and Thursdays. “A purely random phenomenon would tend to exhibit a temporally uniform distribution.”
To track down a culprit hiding in the vastness of space, the team combined three sophisticated tracking methods. They mapped out which satellites were visible to the affected stations, calculated the estimated power needed to cause the disruption, and measured the microscopic differences in time it took for the interference to hit different antennas on Earth.
Pointing the finger into orbit
The mathematical trail led straight to a specific Russian satellite named Cosmos 2546.
But it didn’t stop there. Further analysis suggested that Cosmos 2546 wasn’t acting alone. The researchers linked the activity to the Edinaya Kosmicheskaya Sistema (EKS) — Russia’s early-warning satellite network designed to detect incoming ballistic missiles. Russia began launching these hardware assets into orbit in 2015, adding Cosmos 2546 to the fleet in 2020.
The team’s paper, currently published on the preprint server arXiv, concludes that this space-based missile-detection network may be collectively responsible for widespread GPS degradation across Europe dating back to 2019.
Unsolved riddles in the sky
While the study presents a compelling case for space-based interference, it is important to note that the findings are still allegations and have not yet undergone formal peer review by the wider scientific community. Furthermore, a few baffling anomalies remain unexplained.
For instance, during a single 20-minute window in 2020, the geographic center of the jamming didn’t stay still. It actively migrated across the map.
“On this day, there was progressive movement in the geographic center of interference over multiple events, starting in the Baltic Sea and then moving into Germany and on to the Norwegian Sea,” the team revealed.
Scientists are still trying to determine whether this moving target was caused by a single satellite adjusting its beam as it traveled, or if multiple hidden satellites were taking turns firing off signals in a coordinated orbital dance.
Why this matters
A ten-second GPS glitch might seem minor, but a space-based jammer has massive real-world implications that stretch far beyond a smartphone losing its map connection.
Unlike ground jammers that only affect a small area, a satellite has a clear line of sight across entire continents. This study proves that a single space-based asset can disrupt navigation systems from Spain to northern Norway all at once.
Commercial airplanes and cargo ships rely heavily on satellite navigation. Sudden electronic blind spots force pilots and captains to scramble for older backup systems, increasing the risk of accidents in busy airspace or tight shipping lanes.
Lastly, experts believe these brief bursts are likely routine hardware testing rather than a full-scale attack. By keeping the signal slightly off the main GPS frequency, a nation can test its capabilities in secret. If a conflict breaks out, shifting that signal to the main civilian band could instantly cripple critical infrastructure on the ground.
For now, the European Union has launched an official investigation into the phenomenon, though the details remain strictly classified. As scientists continue to monitor the skies, the discovery serves as a stark reminder of just how fragile our invisible digital architecture truly is.
Sources:
IFLScience, Veritasium, Universe Space Tech