Descent 4D trajectory optimisation for curved GNSS approaches

Gardi, A and Sabatini, R 2017, 'Descent 4D trajectory optimisation for curved GNSS approaches', in Proceedings of the IEEE International Conference on Unmanned Aircraft Systems (ICUAS 2017), Miami, Florida, United States, 13-16 June 2017, pp. 806-815.

Document type: Conference Paper
Collection: Conference Papers

Title Descent 4D trajectory optimisation for curved GNSS approaches
Author(s) Gardi, A
Sabatini, R
Year 2017
Conference name ICUAS 2017
Conference location Miami, Florida, United States
Conference dates 13-16 June 2017
Proceedings title Proceedings of the IEEE International Conference on Unmanned Aircraft Systems (ICUAS 2017)
Publisher IEEE
Place of publication United States
Start page 806
End page 815
Total pages 10
Abstract This paper describes the 4-Dimensional Trajectory (4DT) optimisation algorithm implemented to avoid a variety of Global Navigation Satellite System (GNSS) signal degradations predicted by an Avionics Based Integrity Augmentation system (ABIA). The paper focusses on descent and initial curved GNSS approach phases in a dense Terminal Manoeuvring Area (TMA) scenario, with multiple aircraft converging on the same short and curved final GNSS approach leg. The reference platform for this study is the Javelin Remotely Piloted Aircraft System (RPAS). The 4DT optimisation algorithm implements three degrees-of-freedom aircraft dynamics models as well as suitable GNSS satellite visibility models based on Global Positioning System (GPS) constellation ephemeris data. Direct transcription methods of the global orthogonal (pseudospectral) collocation family are implemented, generating optimal high-integrity trajectories for curved GNSS approaches in real-time. The optimal trajectories calculated by the pseudospectral method are subsequently processed by control input smoothing and manoeuvre identification algorithms to translate the mathematical optimum into a pilot- /autopilot-flyable and concisely described 4DT intent. The characteristics of the proposed 4DT optimisation algorithm are evaluated in representative simulation case studies targeting short and curved GNSS approaches in dense TMA conditions, showing very satisfactory performance.
Subjects Avionics
Navigation and Position Fixing
Transport Engineering
Keyword(s) GNSS Integrity
GNSS Augmentation
Avionics Based Integrity Augmentation
Unmanned Aircraft Systems
Unmanned Aerial Vehicle
Trajectory Optimisation
4-Dimensional Trajectory
Flight Planning
Caution and Warning
DOI - identifier 10.1109/ICUAS.2017.7991522
Copyright notice © 2017 IEEE
ISBN 9781509044955
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