ALLSAT Jamming Detection System (AJDS)
Detecting GNSS Jamming and Precisely Locating Sources of Interference
The ALLSAT Jamming Detection System (AJDS) helps operators of critical infrastructure detect GNSS jamming early, locate its source in real time, and make informed decisions regarding protective and countermeasures.
When the Source of GNSS Interference Becomes Critical
Global Navigation Satellite Systems (GNSS) such as GPS, Galileo, GLONASS and BeiDou now form the foundation of numerous critical processes. Aircraft rely on GNSS for navigation and precision approach procedures, ports use it for automated logistics operations, and many critical infrastructure operators depend on it for positioning, control and timing services. Reliable position and time information has also become a decisive factor in security applications, transportation networks and power supply systems.
At the same time, the number of reported GNSS interference incidents is increasing worldwide. Jamming attacks can significantly affect the availability of positioning, navigation and timing services. For operators, this is not merely a technical issue, but a risk to safety, availability and operational continuity.
Many monitoring systems are able to detect that interference is present. However, the key question often remains unanswered: where is the interference coming from?
This is exactly where the ALLSAT Jamming Detection System (AJDS) comes in. The solution has been developed not only to detect GNSS interference, but also to precisely localize its source. As a result, operators receive not only an alert about an interference event, but also specific information about its spatial origin. This improves situational awareness, reduces response times and provides the basis for targeted countermeasures.
AJDS is particularly suitable for airports, port facilities, critical infrastructure operators, security organizations and applications where reliable positioning, navigation and timing (PNT) services play a central role.
The Three Components of the ALLSAT AJDS
AJDS is neither a single hardware component nor a purely software-based solution. The system combines specialized antenna technology, high-performance GNSS reference receivers, and the GLOMON platform into a single, integrated solution.
Calian CR8894SXF+ CRPA Antenna
The Calian CR8894SXF+ is a Controlled Reception Pattern Antenna (CRPA) designed as an anti-jamming antenna. In addition to supporting GNSS receivers in interference-affected environments, it provides supplementary information on the direction of an interference source.
The antenna determines the azimuth and elevation of an interference signal, thereby providing the basis for subsequent localization.
Practical benefit: Even with a single reference station, operators gain an initial situational picture of the direction and origin of potential interference sources.
JAVAD Delta-3S GNSS Reference Receiver
The JAVAD Delta-3S is used as the reference station. The receiver continuously provides GNSS data as well as information on potential spoofing events.
This data forms the basis for assessing interference and supports the classification of anomalies within the GNSS infrastructure.
Practical benefit: Operators receive additional information on the integrity and availability of their GNSS-based services.
GLOMON AJDS
All information converges on the GLOMON platform. Here, direction data from multiple reference stations is analyzed, correlated, and processed into a position solution.
The platform visualizes fault events in real time, generates alarms, and provides the calculated coordinates of the fault source.
Practical benefit: A fault report is converted into a verifiable location.
How AJDS Works
The system is based on multiple interconnected reference stations.
When a single station detects interference, its direction can initially be determined. If the same interference is detected by a second station, an initial position solution can be derived. Once three or more stations are involved, the position of the source can be determined with significantly higher precision.
The calculation is performed automatically within the GLOMON platform. The results are visualized in real time and can be forwarded to existing security, control or monitoring systems.
This provides a continuous situational picture of potential GNSS interference within the monitored area.
Key Benefits
Localizing Interference Sources Instead of Merely Detecting Them
Many systems report that interference is present. AJDS enhances this information by providing the position of the interference source.
Practical benefit: Responsible teams receive actionable information instead of simple alarm notifications.
Improved Situational Awareness During GNSS Interference Events
By combining data from multiple reference stations, a more comprehensive picture of the current situation is created.
Practical benefit: Incidents can be assessed and prioritized more quickly.
Real-Time Detection and Alerting
Interference events are detected and processed immediately.
Practical benefit: Response times are reduced and risks can be assessed more quickly.
Support for Critical Infrastructure
AJDS has been developed for applications where availability and operational reliability are essential.
Practical benefit: Operators gain greater transparency regarding potential risks to GNSS-based processes.
Scalable System Architecture
The number of reference stations can be adapted to the specific infrastructure.
Practical benefit: Flexible deployment, from individual sites to wide-area monitoring.
Integration into Existing Systems
The results can be integrated into existing monitoring and security environments.
Practical benefit: Existing processes can be maintained and extended.
Typical Applications
Airports and Aviation
GNSS-based navigation and surveillance systems are key components of modern aviation infrastructure. AJDS helps operators detect disruptions early and pinpoint their source.
Ports and Logistics Centers
Automated processes, vehicle navigation, and container logistics rely on reliable GNSS data. AJDS provides transparency in the event of disruptions and supports rapid root cause analysis.
Critical Infrastructure
Energy providers, transportation infrastructure, and public institutions are increasingly dependent on precise positioning and timing services. AJDS supports the monitoring and assessment of potential disruptions.
Security and Defense Applications
GNSS jamming plays an increasingly important role in modern threat scenarios. AJDS provides additional information about the origin and propagation of jamming, thereby improving situational awareness.
Research and Development
The solution is suitable for research in the areas of GNSS resilience, anti-jamming technologies, and future PNT infrastructures.
Who Is AJDS Suitable For?
Critical Infrastructure Operators
They require high availability of their positioning, navigation and timing services and must be able to respond quickly to interference events.
Airports and Air Navigation Service Providers
They need to continuously monitor GNSS-based systems and identify potential risks at an early stage.
Port Operators and Logistics Companies
They rely on dependable GNSS data for automation, navigation and operational processes.
Security and Defence Organizations
They require additional information on electronic interference and its origin.
Research Institutions and System Integrators
They use AJDS to analyze interference events and develop resilient PNT solutions.
Why ALLSAT?
ALLSAT has many years of experience in the fields of GNSS, reference station networks, monitoring, and critical infrastructure. Users benefit from technical consulting, project support, training, and customized system solutions tailored to their specific requirements.
From planning through implementation to ongoing operations, ALLSAT supports projects with a strong practical focus and a deep understanding of GNSS-based applications.
Frequently Asked Questions
What is the ALLSAT Jamming Detection System (AJDS)?
The ALLSAT Jamming Detection System (AJDS) is a solution for the real-time detection and localization of GNSS interference. The system combines CRPA antennas, GNSS reference receivers and the GLOMON platform into an integrated overall solution.
How does the ALLSAT Jamming Detection System work?
Multiple reference stations detect interference and determine its direction. The information is combined in GLOMON and processed into a position solution. This enables the position of an interference source to be calculated and visualized.
Can the ALLSAT Jamming Detection System localize GNSS interference sources?
Yes. The combination of multiple reference stations enables the position of an interference source to be calculated. As the number of participating stations increases, the accuracy of the localization improves.
Does the ALLSAT Jamming Detection System also detect spoofing attacks?
The GNSS reference receivers used in the system additionally provide information on potential spoofing events. This allows corresponding anomalies to be included in the situational assessment. However, the primary focus of AJDS is the detection and localization of GNSS interference sources.
What distinguishes AJDS from conventional GNSS monitoring systems?
Many GNSS monitoring solutions detect interference and document its effects. The ALLSAT Jamming Detection System goes one step further and enables the localization of the interference source. As a result, operators receive information not only about the event itself, but also about its origin.
Which applications is the ALLSAT Jamming Detection System suitable for?
It is suitable, among others, for airports, ports, energy providers, transportation infrastructures, security organizations and operators of GNSS-based systems.
Is AJDS scalable?
Yes. The number of reference stations can be individually adapted to the requirements of the respective project.
Why is AJDS relevant for resilient PNT infrastructures?
Many critical processes today depend on reliable positioning, navigation and timing information. AJDS helps to detect GNSS interference at an early stage, localize its origin and better assess the impact on operational processes. This enables operators to respond more quickly and increase the availability of their systems.
Would you like to know how AJDS can be integrated into your infrastructure?
Talk to our specialists about your requirements and possible use cases.
Together, we’ll find the right solution for your project.
