Flight Management Trajectory Calculation Polar Regions
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Solution Overview
Problem
Flight management systems face complexity in calculating aircraft trajectories and determining true North in polar regions, as existing methods require additional verification steps and frame pivoting, complicating the calculation process.
Innovation Solution
A flight management system using a generic calculation procedure that employs spherical or ellipsoidal representation of the globe, with input data including angular deviations and distances, and conventions to define true North orientation, allowing for simplified calculations regardless of aircraft position, including in polar regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If verification steps are added to determine whether aircraft position is in polar region, then calculation accuracy is improved, but device complexity increases
Solution Approach 1:
The invention divides the globe into polar regions and non-polar regions based on latitude thresholds. By segmenting the calculation domain, the system applies different calculation methods for different regions, ensuring accuracy in polar regions while maintaining simplicity in non-polar regions. This segmentation allows the system to handle polar region特殊性 without complicating the overall calculation procedure for all regions.
Solution Approach 2:
The invention applies local quality by using True North for non-polar regions and North Pole Grid for polar regions. Each region has its own appropriate reference system optimized for its characteristics. This local adaptation ensures calculation accuracy is improved where needed (polar regions) without unnecessarily complicating the calculation procedure in non-polar regions where the simpler True North method suffices.
2Measurement precision
If frame pivoting is performed to align polar axis in equator plane, then trajectory calculation accuracy in polar regions is improved, but ease of operation deteriorates
Solution Approach 1:
Instead of pivoting the polar axis to align with the equator plane (complex transformation), the invention inverts the approach by using the North Pole Grid reference system directly for polar regions. This inverted methodology simplifies the calculation procedure by avoiding complex frame transformations while maintaining trajectory calculation accuracy in polar regions.
Solution Approach 2:
The invention changes the reference frame parameter from True North to North Pole Grid when operating in polar regions. This parameter change allows accurate trajectory calculation in polar regions without requiring complex frame pivoting operations, thereby maintaining ease of operation while improving accuracy where it is most needed.
3Ease of operation
If generic calculation procedure is used for all positions, then ease of operation is improved, but measurement precision deteriorates in polar regions
Solution Approach 1:
The invention introduces dynamics by automatically switching between True North and North Pole Grid reference systems based on the aircraft's current latitude. This dynamic adaptation allows the system to maintain a simple generic calculation procedure structure while improving measurement precision in polar regions through automatic reference system selection. The system adapts its parameters based on operating conditions without requiring complex manual intervention.
Data Source
AI summary
A flight management system of an aircraft is provided allowing notably the calculation of a trajectory over the terrestrial globe. The calculation of a trajectory is carried out with respect to a true North, true North being a navigation term referring to the direction of the geographical North pole with respect to a given position. When the current or estimated position of the aircraft is level with the pole, it then becomes impossible to define true North, true North being defined in all the directions or in no direction, depending on the calculation facilities used. The flight management system makes it possible to use a single calculation procedure whatever the current position or the position to be reached of the aircraft on the terrestrial globe.