Introduction
GNSS interference has become a growing challenge in the Baltic Sea, affecting maritime navigation, aviation, and critical infrastructure. While numerous datasets and services, such as gpsjam.org, spoofing.skai-data-services.com, and flightradar24, report high-altitude GNSS interference based on ADS-B data, there is a significant lack of studies focusing on ground-level interference. Since most critical infrastructure relies on GNSS at ground level, this gap in research leaves many questions unanswered about the real-world impact of interference on essential systems.
To bridge this knowledge gap, GPSPATRON and Gdynia Maritime University have established a scientific and technical collaboration aimed at systematically studying GNSS interference at ground level. This partnership combines GPSPATRON’s expertise in real-time GNSS interference monitoring and classification is complemented by the Faculty of Navigation at Gdynia Maritime University’s extensive knowledge of how GNSS spoofing and jamming affect maritime navigation, port security, and vessel operations.
The study, conducted from June to November 2024, utilized GPSPATRON’s proprietary GNSS interference monitoring system, integrating the GP-Probe TGE2-CH3 sensor and the GP-Cloud platform. The GP-Probe TGE2-CH3 is a high-end GNSS signal monitoring device designed to capture full-spectrum GNSS signals and transmit them in real time to GP-Cloud for processing. The sensor collects raw signal data, enabling comprehensive analysis of jamming, spoofing, and other anomalies affecting GNSS performance.
GP-Cloud, GPSPATRON’s cloud-based analytics platform, processes and interprets incoming data, identifying interference patterns, classifying anomalies, and providing real-time visualization. By working in tandem, the GP-Probe continuously streams data, while GP-Cloud applies advanced algorithms to detect disruptions, measure their impact, and generate detailed reports.
The sensor was installed on the Faculty of Navigation building at Gdynia Maritime University, directly on the shoreline at approximately 15 meters above sea level. The accompanying screenshot shows the exact installation location on a map, where detection range circles indicate the estimated distances at which interference sources with different antenna heights could be detected.
This collaborative effort represents a significant step toward understanding and mitigating GNSS interference threats in the Baltic region. The findings contribute valuable insights to maritime authorities, port operators, and regulatory bodies, highlighting the need for enhanced GNSS monitoring capabilities to protect critical navigation and communication systems.
Key Findings
- A total of 84 hours of GNSS interference was detected, confirming persistent disruptions in the region, primarily caused by jamming rather than spoofing.
- October recorded the highest interference activity, with six major jamming incidents totaling 29 hours, highlighting an intensified interference pattern.
- Two primary interference types were identified:
- Multi-constellation jamming, detected throughout June to September, indicating broad-spectrum interference affecting multiple GNSS systems.
- Multi-tone interference, first observed in October, suggesting a change in jamming tactics, potentially signaling more sophisticated techniques.
- Long-duration interference events exceeding 7 hours were recorded, significantly disrupting GNSS-dependent maritime navigation, port operations, and infrastructure reliability.
- Severe degradation in GNSS positioning accuracy was observed during interference events, with errors increasing from the nominal 3–5 meters to over 35 meters, posing safety and operational risks.
- No correlation was found between terrestrial GNSS interference and ADS-B-based detections, reinforcing the limitations of relying solely on airborne interference monitoring systems to assess threats to ground-level infrastructure.
- Strong indications of mobile maritime jamming sources were identified , with interference signals exhibiting movement patterns consistent with vessels navigating in the Baltic Sea.
