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Helical Flight Path Trajectories for Autopilot Evaluation

  • Gertjan Looye
Conference paper

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.

Keywords

Wind Shear Side Slip Angle Bank Angle Ground Speed Speed Tracking 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Kaminer, I., Pascoal, A.M., Hallberg, E., Silvestre, C.: Trajectory Tracking for Autonomous Vehicles: An Integrated Approach to Guidance and Control. AIAA Journal of Guidance, Control and Dynamics 21(1), 29–38 (1998)zbMATHCrossRefGoogle Scholar
  2. 2.
    Lambregts, A.A., Cannon, D.G.: Development of a control wheel steering mode and suitable displays that reduce pilot work load and improve efficiency and safety of operation in the terminal area and in wind shear. AIAA-79-1887 (1979)Google Scholar
  3. 3.
    Brockhaus, R.: Flugregelung. Springer, Heidelberg (1994)Google Scholar
  4. 4.
    Graham Richard, H.: SR-71 revealed: the untold story. Zenith Press, Minneapolis (1996)Google Scholar
  5. 5.
    Rolf, R.: Course and Heading Changes in Significant Wind. AIAA Journal of Guidance, Control and Dynamics 30(4) (2007); Erratum published in 33(4) (2010)Google Scholar
  6. 6.
    National Imagery and Mapping Agency, 3rd edn. Department of Defence World Geodetic System, NIMA TR 8350.2 (2000)Google Scholar
  7. 7.
    Bauschat, M., Mönnich, W., Willemsen, D., Looye, G.: Flight Testing Robust Autoland Control Laws. AIAA-2001-4208 (2001)Google Scholar
  8. 8.
    Looye, G.: An integrated approach to aircraft modelling and flight control law design. PhD. thesis, TU-Delft (2008)Google Scholar
  9. 9.
    Lambregts, A.A.: Vertical flight path and speed control autopilot design using total energy principles. AIAA-83-2239 (1983)Google Scholar
  10. 10.
    Bertsch, L., Looye, G., Eckhard, A., Schwanke, S.: Flyover Noise Measurements of a Spiralling Noise Abatement Approach Procedure. In: 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Orlando, Florida, USA (2010)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Gertjan Looye
    • 1
  1. 1.German Aerospace Center, DLR–OberpfaffenhofenInstitute of Robotics and MechatronicsGermany

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