Onboard Navigation Display for Aircraft Trajectory Limits
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Solution Overview
Problem
Conventional display systems for aircraft do not effectively display self-assessed and contracted four-dimensional navigation limits, which are crucial for accurate trajectory prediction and adherence to flight plans, leading to a lack of visualization of navigation boundaries during flight.
Innovation Solution
A method is implemented to calculate and display both self-assessed and contracted navigation limits on an onboard display element, using an onboard subsystem to estimate navigation accuracy and acquiring contracted limits from a third-party navigation controller, thereby rendering graphical representations of planned trajectories along with altitude, cross-track, and temporal limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional display systems are used, then the display format is simple, but the navigation limits (self-assessed and contracted) are not displayed
Solution Approach 1:
The navigation limits are segmented into two distinct types: self-assessed navigation limits (calculated by the aircraft's own navigation system) and contracted navigation limits (received from external air traffic control). Each type is calculated and displayed separately on the display element, allowing pilots to distinguish between internally-generated and externally-imposed limits while maintaining a unified display interface.
Solution Approach 2:
The display element is designed to serve multiple functions: displaying the planned flight path, actual position, and both types of navigation limits simultaneously. The system can adaptively switch between displaying self-assessed limits, contracted limits, or both together based on flight conditions and ATC requirements, making the display system versatile without requiring multiple separate displays.
2Measurement precision
If four-dimensional navigation limits are displayed, then navigation accuracy management is improved, but the information processing complexity increases
Solution Approach 1:
The system performs preliminary calculations of self-assessed navigation limits using the aircraft's own navigation system before flight or during flight planning. These pre-calculated limits are then integrated with contracted limits received from ATC, reducing the real-time processing burden during actual flight operations while maintaining high navigation accuracy.
Solution Approach 2:
The display system continuously monitors the aircraft's actual position relative to both self-assessed and contracted navigation limits, providing real-time feedback to pilots. This feedback mechanism allows the system to dynamically update the display with current deviation information, enabling precise navigation accuracy management without requiring complex manual calculations by the flight crew.
Data Source
AI summary
A method of displaying navigation limits for a planned travel route of a vehicle is presented here. The method calculates estimated navigation limits for the vehicle using an onboard subsystem of the vehicle, where the estimated navigation limits represent self-assessed navigation accuracy of the vehicle relative to the planned travel route. Contracted navigation limits are acquired for the vehicle, where the contracted navigation limits represent specified navigation accuracy of the vehicle, relative to the planned travel route, as mandated by a third party navigation controller. A navigation display is rendered on an onboard display element such that it includes graphical representations of the planned travel route, at least one of the estimated navigation limits, and at least one of the contracted navigation limits.