Equipage-Dependent In-Trail Spacing for Arrival Traffic Scheduling
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Solution Overview
Problem
Current air traffic management systems face challenges in scheduling arrival traffic effectively due to variability in Flight Management Systems (FMS) equipage across different aircraft types, leading to inconsistencies in arrival time accuracy and difficulty in implementing Continuous Descent Operations (CDOs, especially when aircraft from different directions merge.
Innovation Solution
An arrival management system that applies customized equipage-dependent in-trail spacing buffers at metering fixes and runways, taking into account the temporal delivery performance of various FMS guidance methods, to maximize the success rate of CDOs and maintain minimum arrival throughput, while dynamically downsizing these buffers to meet demand and throughput requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed spacing buffers are applied to all aircraft regardless of FMS equipage, then simplicity of scheduling is maintained, but arrival time accuracy deteriorates and CDO success rate decreases
Solution Approach 1:
The patent applies different spacing buffer values to different aircraft based on their FMS equipage type. Aircraft with advanced 4-D guidance systems receive smaller spacing buffers, while aircraft with basic FMS receive larger buffers. This local differentiation improves arrival time accuracy for equiped aircraft without compromising safety for all aircraft.
Solution Approach 2:
The scheduling system dynamically adjusts the spacing buffer parameter based on the FMS equipage classification of each aircraft. By changing this critical parameter according to aircraft capability, the system achieves both improved arrival time accuracy and maintained safety margins.
2Reliability
If larger spacing buffers are applied to ensure safety for all aircraft types, then safety is improved, but airspace capacity and throughput decrease
Solution Approach 1:
The patent implements location-specific and aircraft-specific spacing buffers. Aircraft with advanced FMS equipage operating in suitable conditions receive reduced spacing buffers, allowing tighter scheduling and higher throughput. Aircraft without advanced equipage or operating in less favorable conditions maintain larger buffers for safety.
Solution Approach 2:
The spacing buffer is not a fixed value but a dynamic parameter that adjusts based on aircraft FMS equipage type, weather conditions, and traffic situation. This dynamic adjustment allows the system to optimize safety margins while maximizing airspace utilization.
3Productivity
If reduced spacing buffers are applied to increase airspace capacity, then productivity is improved, but safety and reliability deteriorate
Solution Approach 1:
The system changes the spacing buffer parameter based on the capability assessment of each aircraft. By linking the buffer parameter to FMS equipage classification, the system enables reduced buffers (higher capacity) for capable aircraft while maintaining adequate buffers (higher safety) for less capable aircraft.
4Use of energy by moving object
If continuous descent operations are prioritized to reduce fuel consumption, then energy efficiency is improved, but arrival time accuracy and spacing control deteriorate
Solution Approach 1:
The patent enables CDO operations with differentiated spacing buffers based on FMS equipage. Aircraft with 4-D guidance systems that can precisely control their descent receive smaller spacing buffers, allowing uninterrupted CDO and fuel savings. Aircraft without such capability receive larger buffers that accommodate less precise timing, maintaining safety while allowing CDO where feasible.
Data Source
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AI summary
Systems and methods for generating arrival traffic schedules incorporating equipage-dependent in-trail spacing (time or distance). An arrival management system has a ground-based scheduling tool that applies customized spacing buffers between in-trail aircraft depending on the types of FMS equipage onboard aircraft sequence pairs.