Mapping Galileo Parameters to SBAS Integrity Risk Assessment
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Solution Overview
Problem
Current satellite reference systems, such as the Galileo system, lack a standardized integrity risk determination method, leading to non-conservative assessments and potential false alarms, which are not aligned with the aviation community's requirements for consistency with the Satellite Based Augmentation System (SBAS) concepts.
Innovation Solution
A method that maps Galileo parameters onto SBAS parameters to determine the integrity risk, using new parameters like 'signal in space monitored accuracy' (SISMdA) and incorporating them into standardized WAAS protection level equations, allowing for a consistent integrity concept similar to SBAS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Galileo integrity concept is used with non-standardized procedures, then the continuity and availability are the highest, but the assessment is non-conservative and not aligned with aviation community requirements
Solution Approach 1:
The patent transforms Galileo-specific integrity parameters into SBAS-equivalent parameters through mathematical relationships. Key parameter transformations include converting Galileo's alert limit and integrity risk parameters into SBAS's protection level and alarm rate parameters, enabling consistent integrity assessment across different satellite navigation systems while maintaining aviation community standards
Solution Approach 2:
The patent introduces an intermediary mapping layer between Galileo and SBAS integrity concepts. This mapping layer uses standardized SBAS parameters as an intermediate representation to bridge the two different integrity assessment approaches, allowing Galileo systems to achieve SBAS-level consistency without losing their operational advantages
2Reliability
If a standardized SBAS integrity concept is adopted for Galileo, then consistency with aviation community requirements is achieved, but the procedure becomes more complex
Solution Approach 1:
The patent copies the proven SBAS integrity assessment framework and applies it to Galileo systems through parameter mapping. By replicating the standardized SBAS methodology and adapting it to Galileo's specific parameters, the patent achieves aviation community consistency without requiring complete system redesign, thus managing complexity effectively
Solution Approach 2:
The patent creates a universal integrity assessment approach that can handle both Galileo and SBAS systems through a common parameter mapping framework. This universal method allows the same integrity assessment procedure to work across different satellite navigation systems, reducing the need for system-specific complex procedures
3Reliability
If false alarms are reduced through more conservative assessment, then the reliability improves, but the number of alarms may increase
Solution Approach 1:
The patent implements dynamic alarm threshold adjustment based on the mapped protection level parameters. By continuously adapting the alarm criteria according to the standardized SBAS-derived protection levels and their statistical properties, the system optimizes the balance between false alarm reduction and meaningful alert generation, preventing excessive alarming while maintaining high reliability
Data Source
AI summary
Methods and apparatus of determining an integrity risk of a satellite reference system are provided. Galileo parameters according to the Galileo integrity concept are detected. The Galileo parameters are imaged onto satellite based augmentation system (SBAS) parameters used in the SBAS. The integrity risk of the satellite reference system is determined according to the SBAS integrity concept using the SBAS parameters.