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ICARUS participation at ICRAT'12

Luis Delgado and Marc Pérez-Batlle are both presenting a research paper. Xavier Prats is presenting a tutorial.

5th International Conference on Research in Air Transportation — ICRAT 2012

May 22-25, 2012 — University of California, Berkeley


  • Tuesday May 22nd Xavier Prats presents the tutorial:

Instrument Flight Procedures

The objective of this tutorial is to provide an overview of instrument flight procedures. A wide vision will be given, ranging from the basic aspects of the radio navigation systems that make instrumental flights possible, to procedures design criteria and air traffic management (ATM) strategies and concepts build upon these procedures. The different procedures associated to each particular flight phase will be explained. The student will receive some examples of instrumental flight charts that will be analyzed and discussed at the end of the tutorial. The principal topics to be discussed include:

Basic background on flight rules, airspace classes and air traffic services.
Basic background on conventional and satellite based radio navigation.
Area navigation (RNAV) and required navigation performance (RNP) concepts.
Instrumental departure, arrival, and holding procedures.
Instrumental approaches: non-precision, precision, APV/LPV, visual.
Brief overview on the design criteria for instrumental procedures (ICAO Doc8168 - PANS OPS).
Discussion on airspace management (ASM) strategies and specific procedures in dense terminal maneuvering areas (TMA).

  • Wednesday May 23rd Marc Perez-Batlle presents the paper:

Evaluation of separation strategies for Unmanned Aerial Systems


This paper analyzes loss of separation scenarios when an Unmanned Aircraft (UA) enters in conflict with a much faster airplane flying at the same altitude. Separation distances are analyzed in terms of minimum heading changes and reaction times. Results show that maneuvers need to be performed well in advance if the (low-speed) UA is the aircraft that changes its heading. In some cases the time in which the UA and the intruder are in conflict could be too long, and may even involve multiple airliners flying over the same airway. Given that standard separation strategies may have a negative impact on the UA mission, in this paper a set of pre-planned separation maneuvers are proposed. These maneuvers aim to improve the situational awareness of both air traffic controller and UA pilot- in-command, but also to disrupt as less as possible the mission performed by the UA and to minimize the uncertainty in the reactions the UA may adopt autonomously if the link with the ground station is lost. Some preliminar real-time simulations are shown, using a UA ground station simulator linked to a air traffic control simulator.


  • Thrusday May 24th Luis Delgado presents the paper:

ATFM airborne delays without extra fuel consumption in wind conditions


Air Traffic Flow Management (ATFM) regulations, such as ground holdings, are often canceled before their initially planned ending time. The ground delays impact on the cost of recovering part of the delay if the regulation is canceled, as aircraft are still at the origin airport. In previous publications, the authors have suggested a speed reduction strategy to split the assigned ATFM delay between ground delay and airborne delay. By flying at the the minimum speed that gives the same fuel consumption as initially planned, the airline can maximize the airborne delay without any extra fuel consumption. In this paper, the effect of wind on the amount of airborne delay is assessed and a case study of Chicago O’hare airport is presented. Results show that wind has a great effect on the airborne delay that can be achieved and that, in some cases, even tail winds might lead to an increase of airborne delay.