Synthetic Vision Display Coherence Checks for Aircraft Navigation
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Solution Overview
Problem
Erroneous displays in synthetic vision systems of aircraft can lead to critical and potentially dangerous pilot reactions due to errors in aircraft position or attitude parameters, necessitating a secure method to prevent such inaccuracies.
Innovation Solution
A method that determines control objects within the synthetic vision system's field of view, verifies coherence using independent projection rules, and compares positions to detect inconsistencies, issuing alerts and modifying the display when discrepancies exceed a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the synthetic vision system displays terrain and obstacles based on aircraft position and attitude parameters, then the pilot receives visual information for navigation and collision avoidance, but errors in position or attitude parameters can cause erroneous displays that lead to dangerous pilot reactions
Solution Approach 1:
The patent applies preliminary action by performing coherence verification before the pilot acts on the displayed information. The system pre-calculates expected positions of control points using independent projection rules and compares them with displayed positions, detecting potential errors before they can cause dangerous pilot reactions. This proactive verification prevents erroneous displays from reaching the pilot.
Solution Approach 2:
The patent introduces an intermediary verification mechanism between the aircraft sensor data and the final display. The coherence verification system acts as a mediator that independently calculates expected positions and compares them with displayed positions, serving as a safety layer that filters out erroneous displays before they can affect pilot decision-making.
2Measurement precision
If the system uses independent projection rules to verify display coherence, then detection accuracy improves, but computational complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the verification process into discrete control points on the terrain and obstacles. Instead of verifying the entire display at once, the system selects specific control points (vertices of terrain polygons, obstacle positions) and verifies their positions independently. This segmentation makes the complex verification task manageable and computationally efficient.
Solution Approach 2:
The patent uses copying by creating a virtual copy of the display through independent projection rules. The verification system generates expected positions of control points as a copy of what should be displayed, then compares this copy with the actual display. This copying approach simplifies verification by working with discrete position data rather than complex graphical rendering.
Data Source
AI summary
The invention relates to a method for securing the operation of a synthetic viewing system of an aircraft. This method comprises the steps of determining at least one control object in the field of view of the synthetic vision system and determining at least one control point belonging to each control object and verifying the consistency of the display of the synthetic vision system. The verification step comprises the sub-steps of recovering a first position corresponding to the displayed position of each control point on the corresponding outline on the display of the synthetic vision system, determining a second position of each control point on the display of the synthetic vision system and comparing the first and second positions.