Journal ArticleDOI
Investigating string stability of a time-history control law for Interval Management
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In this paper, a simplified, closed-form string stability analysis for a time-history speed control law, which has been proposed for interval management, is presented, and simulation results are used to evaluate string behavior and system performance for an approach-spacing operation.Abstract:
Interval Management (IM) is a concept being developed as a part of the Next Generation Air Transportation System (NextGen) and Single European Sky ATM Research (SESAR). The objective of Interval Management is to achieve a more precise spacing interval between an IM aircraft and an assigned target aircraft. Speed commands, calculated by avionics onboard the IM aircraft using state information from the target aircraft received by ADS-B, are implemented by the IM aircraft in order to achieve a desired spacing interval relative to its target aircraft. In some IM operations, it is expected that a string of IM aircraft will be formed, where each aircraft is spacing relative to its immediately preceding aircraft. In the design of a speed control law that calculates speed commands for the IM aircraft, one must not only examine the performance and stability of one aircraft relative to another, but also the performance and stability of the entire string. String behavior fundamentally affects the potential operational practicality of successfully implementing Interval Management in certain environments. This paper presents a simplified, closed-form string stability analysis for a time-history speed control law, which has been proposed for Interval Management. Simulation results are shown to validate the closed-form analysis and are used to evaluate string behavior and system performance for an approach-spacing operation.read more
Citations
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Journal ArticleDOI
Nominal flight time optimization for arrival time scheduling through estimation/resolution of delay accumulation
TL;DR: It is clarified that the optimum scheduled time of arrival can be directly estimated from the cost function of a single aircraft in the case of such a traffic free of delay accumulation, and the maximum runway use and the equality of the operation performance are simultaneously achieved.
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Adaptive prediction of flight time uncertainty for ground-based 4D trajectory management
TL;DR: In this article, an adaptive prediction model of level flight time uncertainty is derived as a function of flight and meteorological conditions, and its effectiveness for ground-based 4D trajectory management is discussed.
Proceedings ArticleDOI
String Stability Analysis of Selected Speed Control Laws for Interval Management
Lesley A. Weitz,John E. Hurtado +1 more
TL;DR: String stability for three IM speed control laws that are candidate control laws for the IM avionics are examined, and simulation results are used to validate the closed-form results, as well as to reveal the effects of control saturation.
Journal ArticleDOI
Decentralized string-stability analysis for heterogeneous cascades subject to load-matching requirements
Laven Soltanian,Michael Cantoni +1 more
TL;DR: A heterogeneous cascade of stable linear time-invariant subsystems is studied in terms of the spatial and temporal propagation of boundary conditions and the decentralized nature of the certificate facilitates subsystem-by-subsystem design of local controllers that achieve string-stable behaviour overall.
Proceedings ArticleDOI
A New Spacing Algorithm to Support Near-Term Interval Management Operations
TL;DR: An alternative algorithm that was designed to be less complex and does not require wind information is presented and results show that the simpler algorithm performs better than the complex algorithm for spacing operations when both the spacing and Target Aircraft are on the same route.
References
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Journal ArticleDOI
Disturbance propagation in vehicle strings
TL;DR: It is shown that small disturbances acting on one vehicle can propagate and have a large effect on another vehicle and this limitation is due to a complementary sensitivity integral constraint.
Journal ArticleDOI
Constant Spacing Strategies for Platooning in Automated Highway Systems
D. Swaroop,J.K. Hedrick +1 more
TL;DR: A framework for establishing conditions for string stability is described and a metric for analyzing the performance of a platoon is developed and different constant spacing vehicle follower algorithms are analyzed.
Proceedings ArticleDOI
A review of constant time headway policy for automatic vehicle following
TL;DR: In this paper, the authors review the relevant issues in constant time headway (CTH) schemes in adaptive cruise control (ACC) systems based on system-level considerations of stability, capacity and safety.
Speed Control Law for Precision Terminal Area In-Trail Self Spacing
TL;DR: In this article, a speed control law for precision in-trail airborne self-spacing during final approach is described, which compensates for dissimilar final approach speeds between aircraft pairs and provides guidance for a stable final approach.
Proceedings ArticleDOI
Simulation Results for Airborne Precision Spacing along Continuous Descent Arrivals
TL;DR: This research indicates that Flight Deck-based Merging and Spacing initiated while at cruise altitude and well prior to the Terminal Radar Approach Control entry can significantly contribute to the delivery of aircraft at a specified interval to the runway with a high degree of accuracy and at a reduced pilot workload.