Alexander Lau

Alexander Lau
German Aerospace Center (DLR) | DLR · Air Transportation Systems

Dr.-Ing.

About

41
Publications
3,230
Reads
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129
Citations
Citations since 2017
25 Research Items
110 Citations
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201720182019202020212022202305101520

Publications

Publications (41)
Conference Paper
Full-text available
This paper presents an image processing-based method for analyzing satellite scans taken from 24 airports and runways different in size and location to detect and understand variations in landing behaviors by extracting aircraft wheels rubber spots deposited in runway touchdown zones. The analysis establishes a clear correlation between the observe...
Article
In this study, four distinct approaches for flight frequency regulation are investigated with the objective to mitigate network congestion. The approaches differ in the way how a specific number of daily flights on a route is determined: (1) directly regulating the number of flights, (2) defining an average air traffic flow management (ATFM) delay...
Article
The European Air Traffic Management Network is unique in its complexity due to numerous stakeholders, airspace configurations and accommodated traffic volumes. Such a complexity challenges both tactical visibility and the network resiliency in general. Therefore we reviewed different perspectives of resiliency and robustness to explore advantages o...
Conference Paper
The overall European Air Traffic Management aims for an efficient utilisation of ATM sub-systems like the European Air Traffic Management Network. Highly congested hub airports and controlled airspaces may lead to Demand-Capacity-Balancing issues during high demand periods. Air Traffic Flow Management as one of the European ATM domains resolves the...
Conference Paper
Full-text available
Commercial airlines pay navigation charges for each flight in the European airspace. These charges differ between countries. Thus, flying detours may lead to reduced costs if the longer route uses the airspace of countries with cheaper charges. In this paper, we analyze this incentive for flying routes longer than the shortest ones. While previous...
Article
Full-text available
The current push in automation, communication, and electrical energy storage technologies has the potential to lift urban mobility into the sky. As several urban air mobility (UAM) concepts are conceivable, all relevant physical effects as well as mutual interrelations of the UAM system have to be addressed and evaluated at a sufficient level of fi...
Article
Full-text available
Hybrid laminar flow control (HLFC) on transport aircraft is one of many promising fuel reduction technologies. However, due to high sensitivities of HLFC toward operational boundary conditions, estimations of its overall benefit are usually afflicted with large uncertainties. Among the critical environmental factors is the degradation of laminarity...
Conference Paper
There is a considerable interest in air transportation resilience as a mechanism for coping with the consequences of disruptions to local authorities. Although the identification of metrics and baselines for measuring resilience are still regarded as challenges, we believe that the meaning of disruptions is no longer driven solely by safety threats...
Conference Paper
The European Air Traffic Management Network is unique in its complexity due to numerous stakeholders, airspace configurations and volumes of accommodated traffic. Such a complexity challenges the overall situational awareness during tactical network operations and improvment of network resilience. Before defining network states, different perspecti...
Conference Paper
This paper describes a methodology of quantifying network states. In order to develop operational measures towards improving ATM network performance and resilience, the study initially reviews the difference between resilience and robustness to clarify contribution of resilience in ATFM tactical phase. The importance of network states in defining k...
Conference Paper
Due to flight density in the European airspace, numerous conflicts between aircraft arise. Avoiding conflicts before take-off could improve safety; however, stochastic disturbances to trajectories inhibit deterministic conflict prevention. Conflict probabilities between planned flights can be calculated with departure distributions. We reduce confl...
Article
Die vorliegende Studie repräsentiert eine Nutzenanalyse für die Anwendung des vom Deutschen Wetterdienst (DWD) im LuFo V Verbundprojekt TeFiS Technologie für Flugverkehrsmanagement in großen Strukturen entwickelten Eddy Dissipation Parameter (EDP), welcher ein Maß für die atmosphärische Turbulenz darstellt.
Article
Am 31. Januar 2017 fand bei Harris Orthogon in Bremen unter der Leitung von Michael Eisele im Rahmen des Projektes MET4ATM ein ganztägiger Workshop statt, dessen Ziel ein Einblick in die Lotsenarbeit und deren Anflugführungsverfahren unter Extremwetterbedingungen am Flughafen München war. Als projektexterne Anwender waren die beiden Lotsen Christop...
Conference Paper
The objective of this paper is to investigate the effect of cloud encounter mitigation procedures on operational and economic effectiveness of aircraft with hybrid laminar flow control (HLFC) based on real-world flight routes and weather data. The goal is to evaluate whether cloud mitigation procedures are an appropriate measure to maximize the exp...
Article
An vielen größeren Flughäfen sind bereits heute die Kapazitätspotenziale weitgehend ausgeschöpft, denn der weltweite Luftverkehr ist in den letzten Jahren immer weiter gewachsen. Trotz ökonomisch bedingter Schwankungen wird auch für die Zukunft ein stetiger Anstieg der Flugbewegungen vorausgesagt. Bei engen Lufträumen und hohen Taktraten an Bewegun...
Article
This thesis addresses European Air Traffic Flow Management, and especially tactical Air Traffic Flow Management measures and operations. A sophisticated methodology is developed and described, which considers the application and evaluation of short-term convective forecasts, called nowcasts. The developed model, which covers demand-capacity-balanci...
Conference Paper
This paper represents the first results on the ATC sector capacity within the internal DLR project named VolcATS (Volcanic ash impact on the Air Transport System). The general objectives of the project are among the others, the development of a satellite based solution to determine ash-free airspace and generate a short-term forecast during a volca...
Conference Paper
Full-text available
The complexity of European Air Traffic is accompanied by a continuous risk of conflicts between aircraft. In particular, inaccurate forecasts of aircraft positions prevent a fail-proof prediction of conflicts, especially for large look-ahead times. Uncertainty of departure times is one of the most important factors in trajectory prediction. Therefo...
Chapter
To guarantee a safe journey for each aircraft, air traffic controllers make sure that separation minima are maintained. To prevent controller overburdening, each controller team is responsible for one confined sector. Furthermore, sectors limit the number of flights entering each hour. Compliance to all sector and airport capacity constraints in da...
Conference Paper
In the European Air Traffic Flow Management, en-route conflicts between aircraft may be avoided strategically. One option for strategic deconfliction is the allocation of alternative departure-timeslots. To find the best slots for all flights, we solve a Binary Integer Problem. In this problem, each flight is associated with linear delay costs and...
Conference Paper
The purpose of this paper is to introduce an approach, which serves as initial step for the integration of adverse network impact information, like e.g. weather, to tactical European Air Traffic Flow Management (ATFM). A binary optimization methodology for large-scale linear problem decomposition with column-generation and structured variable prici...
Conference Paper
The purpose of this paper is to evaluate a slot allocation heuristic algorithm close to Eurocontrol‘s Computer-Aided-Slot-Allocation. The heuristic algorithm represents a First-Planned-First-Serve approach for tactical Air Traffic Flow Management slot allocation in order to balance air traffic demand with network capacities. It is part of DLR‘s Net...
Article
I Kurzdarstellung I - 1 Aufgabenstellung I - 2 Voraussetzungen zur Durchführung des Vorhabens I - 3 Planung und Ablauf des Vorhabens I - 4 Wissenschaftlich/technischer Stand - Anknüpfungspunkt I - 5 Zusammenarbeit mit anderen Stellen II Eingehende Darstellung II - 1 Erzielte Ergebnisse II - 1.1 Analyse, Integration und Bewertung – Problemfeldmatrix...
Article
Full-text available
Im Flightpath 2050, in der Hightech-Strategie der Bundesregierung und der Strategie des Hamburger Luftfahrtclusters werden Ziele für die Effizienz des Lufttransports hinsichtlich Nachhaltigkeit, Komfort, Reisezeit und Intermodalität benannt. Im Verbundprojekt Airport2030 werden am Beispiel des Flughafen Hamburg ausgewählte Technologien und Maßnahme...
Conference Paper
Im Flightpath 2050, in der Hightech-Strategie der Bundesregierung und der Strategie des Hamburger Luftfahrtclusters werden Ziele für die Effizienz des Lufttransports hinsichtlich Nachhaltigkeit, Komfort, Reisezeit und Intermodalität benannt. Im Verbundprojekt Airport2030 werden am Beispiel des Flughafen Hamburg ausgewählte Technologien und Maßnahme...
Article
Full-text available
Airport capacity constraints and growing traffic demand in air transportation cause congestion and delay on the ground and in the air. Conservative wake turbulence separation minima in the approach phase guarantee a minimum of in-flight wake encounters of trailing aircraft. On the other hand, in many situations weather-based separation minima could...
Conference Paper
Airport capacity constraints and growing traffic demand in air transportation cause congestion and delay on the ground and in the air. Conservative wake turbulence separation minima in the approach phase guarantee a minimum of in-flight wake encounters of trailing aircraft. On the other hand, in many situations weather-based separation minima could...
Conference Paper
In this study the potential for fuel savings through electric taxiing is investigated. Therefore simple models are used to investigate the difference of fuel consumption during the ground phase and the flight phase of a gate-to-gate mission. By using these models the fuel savings can be estimated, which are the sum of the fuel saved during ground o...

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Projects (2)