Chasing Lightning: Unmasking a Space-Based GNSS Jammer
This lightning talk reveals how researchers detected, characterized, and definitively identified a powerful space-based GNSS interference source that has disrupted navigation across Europe, Greenland, and Canada since 2019. By fusing data from a dense terrestrial GNSS network, advanced statistical detection theory, and raw wideband signal captures, the team traced unprecedented continental-scale jamming events to a constellation of Russian early warning satellites in Molniya orbits, demonstrating that nation-state space-based GNSS denial is now an operational reality.Script
Since 2019, a mysterious interference source has been silently crippling GPS across entire continents, striking Europe, Greenland, and Canada with power levels never before seen. The authors of this paper set out to hunt it down.
Using over 160 International GNSS Service stations, they built a continental-scale detection network optimized for transient interference. When the jammer strikes, stations separated by thousands of kilometers see their signals drop by more than 5 decibels in perfect synchrony, sometimes affecting 58 stations at once.
The interference signature is unmistakable: a 5 megahertz band centered at 1577.5 megahertz, just above GPS L1, with occasional switching to 1558.5 megahertz. On 75 days between 2019 and 2026, these bursts occurred overwhelmingly during business hours on weekdays, pointing to deliberate human operation.
Elevation masking ruled out low-altitude satellites, leaving hundreds of candidates above 1200 kilometers. The breakthrough came from wideband signal captures at geographically remote sites: cross-correlation yielded time difference of arrival measurements that, when fused with orbital data, pointed to exactly one satellite, Cosmos 2546, a Russian early warning satellite in Molniya orbit.
The identification is unambiguous. Every major interference event post-2020 aligns with coverage by satellites in the Russian EKS constellation, confirming that space-based GNSS jamming is not a theoretical threat but an operational capability with continental reach.
This work reveals that nation-state actors can now deny GNSS services across entire regions from space, threatening aviation and critical infrastructure at scale. The multi-modal detection and attribution methods demonstrated here set the foundation for next-generation interference surveillance. You can explore this research further and create your own video summaries at EmergentMind.com.
