RNP Flight Path Variation for Aircraft Spacing and Noise Dispersion
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Solution Overview
Problem
Existing methods for managing flight paths under Required Navigation Performance (RNP) procedures lack effective tools for air traffic controllers to vary aircraft paths, leading to concentrated noise over communities and increased risk of loss of separation between aircraft, while also limiting efficiency and noise management.
Innovation Solution
A system and method that calculates and implements flight path modifications to maintain aircraft within RNP instrument flight procedure boundaries, allowing for real-time adjustments to reduce noise impact and enhance spacing and timing control, using actual navigation performance data to dynamically vary flight paths within defined margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed, consistent flight paths are used under RNP procedures, then aircraft navigation precision and repeatability are improved, but noise concentration over communities increases and air traffic control flexibility is reduced
Solution Approach 1:
The system dynamically adjusts flight paths by introducing controlled variations within RNP containment boundaries. The FMS generates multiple candidate flight paths with different lateral offsets from the nominal centerline, and selects/assigns paths that vary between operations to disperse noise while maintaining navigation precision through automated selection from pre-calculated options
Solution Approach 2:
The system changes the lateral position parameter of flight paths by applying offsets within the RNP containment boundaries. By modifying the flight path lateral offset parameter while keeping longitudinal timing intact, the system achieves noise dispersion without compromising the precision-defined RNP procedure integrity
2Productivity
If fixed flight paths are used under RNP procedures, then operational efficiency is improved, but air traffic controller ability to fine-tune aircraft longitudinal spacing is reduced
Solution Approach 1:
The system performs preliminary calculation of multiple candidate flight paths with varying lateral offsets before flight operations. By pre-computing these options within RNP boundaries and storing them in the FMS, the system enables ATC to select appropriate paths for spacing control without requiring real-time complex calculations, thus maintaining efficiency while gaining flexibility
Solution Approach 2:
The system introduces lateral dimension variation to solve longitudinal spacing problems. By adjusting flight paths in the lateral dimension (within containment boundaries) rather than only in the longitudinal dimension, the system provides ATC with additional control authority to fine-tune spacing while maintaining operational efficiency through automated path management
3Measurement precision
If highly repeatable path-keeping traffic is used, then navigation precision is improved, but risk of loss of separation between aircraft increases
Solution Approach 1:
The system introduces asymmetric variations in flight paths by applying different lateral offsets to different aircraft or to the same aircraft on different operations. This breaks the symmetry of identical repeatable paths while maintaining navigation precision, thereby reducing the risk of loss of separation through deliberate path differentiation
Solution Approach 2:
The system dynamically varies flight paths within RNP containment boundaries to prevent highly repeatable identical trajectories. By continuously or periodically changing the selected flight path from pre-calculated candidates, the system maintains navigation precision through automated management while introducing variability that reduces separation risk
Data Source
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AI summary
An example method for aircraft traffic spacing and timing control with flight path variation of an aircraft includes receiving information of aircraft traffic for an area, determining an aircraft spacing plan for the aircraft traffic for the area based on spacing requirements due to separation standards or flow management constraints for the aircraft traffic, determining that a modification to a flight path of an aircraft is required to meet a longitudinal spacing requirement between the aircraft and one or more additional aircraft of the aircraft traffic based on the aircraft spacing plan, determining a flight path modification to the flight path for the aircraft based on the modification that causes the aircraft to remain within associated margins of the RNP instrument flight procedure and alters the longitudinal spacing between the aircraft and the additional aircraft of the aircraft traffic, and assigning the flight path modification to the aircraft via a data communication link.