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Prats, X., Santamaria, E., Delgado, L., Trillo, N. & Pastor, E. 2013 (Jan-Feb).
Enabling Leg-Based Guidance on Top of Waypoint-Based Autopilots for UAS. Aerospace Science and Technology. Vol. 24 (1) pp. 95-100. Keywords: UAS, flight plan, RNAV |
| Abstract: This paper presents a methodology to extend the guidance functionalities of Commercial Off-The-Shelf autopilots currently available for Unmanned Aircraft Systems (UAS). Providing that most autopilots only support elemental waypoint-based guidance, this technique allows the aircraft to follow leg-based flight plans without needing to modify the internal control algorithms of the autopilot. It is discussed how to provide Direct to Fix, Track to Fix and Hold to Fix path terminators (along with Fly-Over and Fly-By waypoints) to basic autopilots able to natively execute only a limited set of legs. Preliminary results show the feasibility of the proposal with flight simulations that used a flexible and reconfigurable UAS architecture specifically designed to avoid dependencies with a single or particular autopilot solution. |
BibTeX:
@article{prats_13_enabling,
author = {Xavier Prats and Eduard Santamaria and Luis Delgado and Noel Trillo and Enric Pastor},
title = {Enabling Leg-Based Guidance on Top of Waypoint-Based Autopilots for |
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Prats, X., Delgado, L., Ramírez, J., Royo, P. & Pastor, E. 2012 (May-Jun).
Requirements, Issues, and Challenges for Sense and Avoid in Unmanned Aircraft Systems. Journal of Aircraft. Vol. 49 (3) pp. 677-687. Keywords: UAS, Sense and Avoid, regulations, requirements |
| Abstract: The sense and avoid capability is one of the greatest challenges that has to be addressed to safely integrate unmanned aircraft systems into civil and nonsegregated airspace. This paper gives a review of existing regulations, recommended practices, and standards in sense and avoid for unmanned aircraft systems. Gaps and issues are identified, as are the different factors that are likely to affect actual sense and avoid requirements. It is found that the operational environment (flight altitude, meteorological conditions, and class of airspace) plays an important role when determining the type of flying hazards that the unmanned aircraft system might encounter. In addition, the automation level and the data-link architecture of the unmanned aircraft system are key factors that will definitely determine the sense and avoid system requirements. Tactical unmanned aircraft, performing similar missions to general aviation, are found to be the most challenging systems from an sense and avoid point of view, and further research and development efforts are still needed before their seamless integration into nonsegregated airspace. |
BibTeX:
@article{prats_12_requirements,
author = {Xavier Prats and Luis Delgado and Jorge Ramírez and Pablo Royo and Enric Pastor},
title = {Requirements, Issues, and Challenges for Sense and Avoid in Unmanned |
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Prats, X., Ramírez, J., Delgado, L. & Royo, P. 2012 (Apr).
Regulations and Requirements.
In Sense and avoid in UAS: Research and applications.
Angelov, P. (Ed.)
Chap. 4.
pp. 87-117.
John Wiley & Sons, Ltd.,
West Sussex, UK.
Keywords: UAS, Sense and Avoid, see and avoid, regulations, requirements, standards, human factors |
| Abstract: This chapter is devoted to review existing regulations, recommended practices and standards in Sense and Avoid (S&A) for Unmanned Aircraft Systems. Gaps an issues are identified while different factors that are likely to affect actual S&A requirements are also highlighted. It is shown how the environment of operations (flight altitude, meteorological conditions and class of airspace) plays an important role when determining the type of flying hazards that the UAS might encounter. Besides that, the automation level and the data-link architecture of the UAS are also key factors that will definitely determine the S&A system requirements. |
BibTeX:
@incollection{prats_12_regulations,
author = {Xavier Prats and Jorge Ramírez and Luis Delgado and Pablo Royo},
editor = {Plamen Angelov},
title = {Regulations and Requirements},
booktitle = {Sense and avoid in UAS: Research and applications},
publisher = {John Wiley & Sons, Ltd.},
series = {Aerospace Series},
year = {2012},
month = {Apr},
pages = {87-117},
edition = {First},
address = {West Sussex, UK},
url = {http://eu.wiley.com/WileyCDA/WileyTitle/productCd-0470979755.html}
}
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Prats, X., Delgado, L., Royo, P., Perez-Batlle, M. & Pastor, E. 2011 (Jul-Aug).
Departure and approach procedures for unmanned aircraft systems in a visual-flight-rule environment. Journal of Aircraft. Vol. 48 (4) pp. 1280-1290. Keywords: Unmanned Aircraft Systems (UAS), UAV, approach and departure operations, IFR, VFR |
| Abstract: This paper assesses the departure and approach operations of unmanned aircraft systems in one of the most challenging scenarios: flying under visual flight rules. Inspired by some existing procedures for (manned) general aviation, some automatic and predefined procedures for unmanned aircraft systems are proposed. Hence, standardized paths to specific waypoints close to the airport are defined for departure operations, just before starting the navigation phase. Conversely, and for the approach maneuvers, a first integration into a holding pattern near the landing runway (ideally, above it) is foreseen, followed by a standard visual-flight-rule airfield traffic pattern. This paper discuses the advantages of these operations, which aim to minimize possible conflicts with other existing aircraft while reducing the pilot-in-command workload. Finally, some preliminary simulations are shown in which these procedures have been successfully tested with simulated surrounding traffic. |
BibTeX:
@article{prats_11_departure,
author = {Xavier Prats and Luis Delgado and Pablo Royo and Marc Perez-Batlle and Enric Pastor},
title = {Departure and approach procedures for unmanned aircraft systems in |
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