GNSS Jamming Detection via Satellite Count Comparison
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Solution Overview
Problem
Current civil aviation lacks robust solutions for detecting GNSS jamming, which can cause loss of satellite navigation signals due to radiofrequency interference, affecting aircraft position determination and communication.
Innovation Solution
A method and system for automatic detection of GNSS jamming using a detection system with a generation unit, detection unit, and transmission unit, comparing the expected number of satellites to be tracked with the actual number tracked, and emitting detection data when a jamming is detected, allowing for reliable and repetitive detection and transmission of jamming data to user devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reception units are used for satellite navigation tracking, then basic navigation functions are maintained, but the system cannot detect GNSS jamming interference
Solution Approach 1:
The detection unit is integrated into the existing reception unit structure, allowing the same hardware infrastructure to serve both traditional satellite signal reception and jamming detection functions. The detection unit processes satellite signal data already being collected by the reception unit, eliminating the need for completely separate detection hardware and achieving multi-functionality from existing components.
Solution Approach 2:
The detection unit acts as an intermediary component that processes satellite signal data between the reception unit and the aircraft's navigation systems. It compares expected satellite visibility (calculated from aircraft position and satellite ephemeris) with actual tracked satellites, identifying discrepancies that indicate jamming without requiring direct modification of the core reception or navigation systems.
2Reliability
If no detection system is implemented, then the system remains simple, but jamming events cannot be identified and addressed
Solution Approach 1:
The system pre-calculates the expected number of visible satellites based on the aircraft's position, time, and satellite ephemeris data before actual signal reception occurs. This preliminary expectation serves as a reference against which actual satellite tracking results are compared, enabling automatic detection of unexpected signal losses that indicate jamming events.
Solution Approach 2:
The detection unit continuously compares actual satellite tracking data with expected satellite visibility and generates feedback when discrepancies exceed a threshold. This feedback mechanism automatically identifies jamming events and can trigger appropriate responses, creating a closed-loop system that adapts to changing signal conditions without manual intervention.
Data Source
AI summary
A system includes at least one reception unit installed in an aircraft and configured for tracking satellites of the satellite navigation system of the GNSS type. The system includes a generation unit for generating an expected number corresponding to the number of satellites that the reception unit is expected to track, a detection unit including a comparison part for comparing the expected number with a tracked number corresponding to the number of satellites that the reception unit is actually tracking and a decision part for detecting a jamming, as a function of the result of the comparison made by the comparison part and transmitting detection data in the event of detection, and a transmission unit configured to transmit jamming detection data to at least one user device, the system making it possible to detect a jamming of a GNSS system in an automatic and reliable manner.