Satellite Geolocation Integrity Verification via Deviation Statistics
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Solution Overview
Problem
Current methods for verifying the integrity of position information from multiple satellite geolocation devices impose a significant cognitive load on navigational crews and often result in delayed alarms due to high false alarm thresholds, which can compromise navigational safety.
Innovation Solution
A method that computes a deviation statistic between position vectors from multiple geolocation devices, sets a dynamic alarm statistical threshold based on a predetermined probability, and raises an alarm when the deviation exceeds this threshold, thereby reducing false alarms and enhancing timely malfunction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high alarm threshold is set to avoid false alarms, then the number of false alarms is reduced, but the response time to actual malfunctions increases
Solution Approach 1:
The patent applies dynamics by transitioning from a static, fixed alarm threshold to a dynamic threshold that adapts based on the operational context. The system continuously monitors the performance of geolocation devices and adjusts the alarm threshold accordingly, allowing it to be more sensitive during critical periods while being more conservative during stable operations, thus resolving the contradiction between avoiding false alarms and detecting malfunctions timely
Solution Approach 2:
The patent changes the parameter of the alarm threshold from a fixed value to a variable value that depends on multiple factors including device performance history, operational criticality, and statistical analysis of position deviations. This parameter change enables the system to optimize the threshold dynamically, reducing false alarms when confidence is high while maintaining rapid response when malfunctions are suspected
2Reliability
If constant monitoring is performed by navigational crew, then malfunction detection capability is improved, but cognitive load on the crew increases
Solution Approach 1:
The patent implements self-service by enabling the monitoring system to automatically evaluate the performance of geolocation devices without requiring continuous human intervention. The system autonomously performs statistical analysis, compares position deviations against adaptive thresholds, and generates alarms when malfunctions are detected, thereby maintaining high detection capability while significantly reducing the cognitive burden on navigational crew
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors device performance, compares actual position deviations against expected values, and adjusts the alarm threshold based on historical data. This closed-loop feedback enables automatic malfunction detection while keeping the human operator informed through targeted alerts, thus maintaining reliability without requiring constant manual monitoring
Data Source
AI summary
The invention relates to a method and a device for verifying the integrity of position vector information obtained by at least two satellite geolocation devices, each of the geolocation devices being able to receive a plurality of wireless signals from a plurality of separate satellites, and to use the received wireless signals to compute a position vector of said geolocation device, including position coordinates computed in a predetermined spatial reference at a given moment in time, each of the geolocation devices being independent of the other geolocation devices, the satellites used being able to be different from one geolocation device to the next. The method includes, for at least one considered pair of geolocation devices made up of a first geolocation device (Gm) and a second geolocation device (Gn), computing (34) a deviation statistic between a first position vector computed by the first geolocation device and a second position vector computed by the second geolocation device, and computing (36) an alarm statistical threshold (S(m,n)) based on the deviation statistic and a first predetermined probability (PFA). The method makes it possible to raise a malfunction alarm by using the computed alarm statistical threshold. The invention also makes it possible to compute (44), for at least one geolocation device of each pair of geolocation devices, an integrity radius from the alarm statistical threshold and a second predetermined probability (PND).