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Helical Flight Path Trajectories for Autopilot Evaluation

Looye, Gertjan (2011) Helical Flight Path Trajectories for Autopilot Evaluation. In: Selected Papers of the First CEAS Specialist Conference on Guidance, Navigation and Control Advances in Aerospace, Guidance, Navigation and Control. Springer. pp. 79-90. ISBN 978-3-642-19816-8.

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Abstract

A helical flight path trajectory (helix) involves flying exact circles over the ground while climbing or descending at a given flight path angle and speed profile. The manoeuvre is challenging to fly in windy conditions, since the path reference is inertial whereas the aircraft naturally tends to move with the air mass. Tracking a helix introduces periodical lateral and longitudinal wind shears in turn. This makes the helix an excellent manoeuvre for testing autopilot control laws, allowing to evaluate co-ordination of longitudinal and lateral modes, tracking accuracy along a curved flight path, combined tracking of inertial (flight path) and air mass-based references (airspeed), and to evaluate the trade-off between behaviour in turbulence and wind shear. Since helical flight path trajectories are not a standard option in most autopilot / flight management systems, this chapter derives generally applicable reference variables and high-level control strategies for use with typical autopilot structures. This allows the reader to fly the helix manoeuvre using his or her own autopilot design. As an example, simulation and flight test results for an autopilot developed for DLR´s test aircraft ATTAS will be discussed.

Document Type:Book Section
Title:Helical Flight Path Trajectories for Autopilot Evaluation
Authors:
AuthorsInstitution or Email of Authors
Looye, GertjanRobotik und Mechatronik
Date:April 2011
Journal or Publication Title:Selected Papers of the First CEAS Specialist Conference on Guidance, Navigation and Control
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:No
Page Range:pp. 79-90
Publisher:Springer
Series Name:Advances in Aerospace, Guidance, Navigation and Control
ISBN:978-3-642-19816-8
Status:Published
Keywords:flight control, flight test, autopilot,
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems & Cabin
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics > System Dynamics and Control (former Control Design Engineering)
Deposited By: Dr. Gertjan Looye
Deposited On:10 Jan 2012 12:58
Last Modified:10 Jan 2012 12:58

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