Avionics Anchor Point Adaptation for Non-Precision FLS Landing
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Solution Overview
Problem
Existing non-precision FLS approach modes for aircraft landing are hindered by improper positioning of the anchor point, which prevents the implementation of FLS mode until touchdown zones on the runway.
Innovation Solution
An avionics computer, such as a flight management system, adjusts the anchor point of a virtual path by comparing the distance between the initial anchor point and the runway threshold point, checking if the terminal segment crosses the runway threshold, and defining the threshold point as the new anchor point if the distance is less than a predetermined value, allowing FLS mode to be implemented until touchdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anchor point is positioned according to the conventional system, then the FLS mode can be implemented with standard procedures, but the FLS mode cannot be implemented as far as the touchdown zone and is stopped at a certain distance from the runway
Solution Approach 1:
The patent applies dynamics by making the anchor point position adjustable rather than fixed. The system dynamically adapts the anchor point location based on calculated parameters (distance to touchdown zone, approach angle) to optimize FLS mode implementation. This allows the virtual path to be extended to the touchdown zone while maintaining safety margins, resolving the contradiction between conventional positioning limitations and the need for extended FLS mode availability.
2Reliability
If the anchor point is moved closer to the touchdown zone to enable FLS mode implementation, then the availability of FLS mode improves, but the safety margin may be reduced
Solution Approach 1:
The patent applies parameter changes by calculating and adjusting the anchor point position based on multiple parameters including distance to touchdown zone, approach angle, and safety margins. The system modifies the anchor point location parameters dynamically to achieve optimal balance between FLS mode availability and safety requirements, rather than using a fixed conventional position.
Solution Approach 2:
The system implements feedback by continuously evaluating the anchor point position against safety criteria and FLS mode requirements. The processing unit calculates whether the anchor point should be adjusted based on current flight parameters and safety margins, creating a closed-loop control system that adapts the virtual path configuration to maintain both safety and operational capability.
Data Source
AI summary
The avionics computer comprises a processing unit configured to compare the distance between a first position and a second position with a predetermined distance, the first position corresponding to the position of an initial anchor point of an initial terminal segment and the second position corresponding to the position of a landing threshold point of the runway, to check whether the initial terminal segment of the virtual path crosses the threshold of the runway and, if the distance between the first position and the second position is less than the predetermined distance and if the initial terminal segment of the virtual path crosses the threshold of the runway, to define the landing threshold point as an anchor point of a terminal segment of a virtual path for a non-precision FLS approach mode, the avionics computer thus making it possible to increase availability to implement FLS mode.