ADS-B Outage Detection for Satellite Navigation Interference
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Solution Overview
Problem
Aircraft face navigation system outages due to signal interference or environmental conditions, which can lead to incorrect timestamp and date issues in satellite navigation systems, affecting avionics and flight operations.
Innovation Solution
An apparatus and method using automatic dependent surveillance broadcast (ADS-B) position reports to detect outages by tracking geographic positions of aircraft, switching from ADS-B reports to estimated positions when necessary, and generating notifications based on a threshold, to alert users of satellite navigation system unavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aircraft rely on satellite navigation systems for positioning, then navigation availability is improved, but reliability deteriorates when signal interference or environmental conditions cause outages
Solution Approach 1:
The system introduces ADS-B position reports as an intermediary data source to detect navigation outages. When satellite navigation signals are unavailable or unreliable, the system uses ADS-B reports from multiple aircraft as a mediator to identify outage conditions and trigger alternative positioning methods, thereby maintaining navigation reliability while preserving availability.
Solution Approach 2:
The system implements feedback by continuously monitoring the consistency and availability of satellite navigation data through ADS-B reports. When navigation outages are detected through analysis of position report patterns, the system provides feedback to activate alternative navigation methods, ensuring reliable operation during signal interference or environmental constraints.
2Measurement precision
If the system monitors multiple aircraft positions to detect outages, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system merges data from multiple ADS-B position reports of different aircraft into a unified outage detection mechanism. By combining position information from multiple sources and analyzing their temporal and spatial patterns, the system achieves high detection accuracy without requiring complex individual monitoring components for each aircraft.
Solution Approach 2:
The monitoring system is designed with multi-functionality, serving both as a data collection mechanism for navigation status and as an outage detection algorithm. This universal approach allows the same system infrastructure to perform multiple functions: gathering ADS-B reports, analyzing navigation signal quality, detecting outages, and triggering alternative positioning methods.
3Duration of action of stationary object
If the system switches to estimated positions during outages, then navigation continuity is improved, but measurement precision deteriorates
Solution Approach 1:
The system prepares for navigation outages by pre-establishing alternative positioning methods and thresholds for detecting outage conditions. When outages occur, the system can immediately switch to estimated positions or alternative navigation data, cushioning against the disruption and maintaining continuous navigation operation even though precision may temporarily deteriorate.
Data Source
AI summary
A method of supporting flight operations of aircraft includes accessing a data stream of geographic positions of aircraft on respective flights. The geographic positions are determined using a satellite navigation system and obtained from automatic dependent surveillance broadcast (ADS-B) position reports, or estimated independent of the ADS-B position reports. The geographic positions are tracked to determine a number of the respective flights for which the geographic positions change from being obtained from the ADS-B position reports, to being estimated independent of the ADS-B position reports. The method includes determining an outage in which the satellite navigation system is unavailable to the aircraft, based on the number of the respective flights for which the geographic positions change from the ADS-B position reports to estimated independent of the ADS-B position reports, and based on a threshold. And an outage notification is generated that is output to alert users of the outage.