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An Autopilot Based on a Local Control Network Design for an Unmanned Surface Vehicle

Published online by Cambridge University Press:  12 March 2012

SK Sharma ,
W Naeem  and
R Sutton
SK Sharma*
Affiliation:
(School of Marine Science and Engineering, Plymouth University, Plymouth)
W Naeem
Affiliation:
(School of Electronics, Electrical Engineering and Computer Science, Queen's University Belfast, Belfast)
R Sutton
Affiliation:
(School of Marine Science and Engineering, Plymouth University, Plymouth)
*
(E-mail: sanjay.sharma@plymouth.ac.uk)
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Abstract

Over recent years, a number of marine autopilots designed using linear techniques have underperformed owing to their inability to cope with nonlinear vessel dynamics. To this end, a new design framework for the development of nonlinear autopilots is proposed. Local Control Networks (LCNs) can be used in the design of nonlinear control systems. In this paper, a LCN approach is taken in the design of a nonlinear autopilot for controlling the nonlinear yaw dynamics of an unmanned surface vehicle known as Springer. It is considered the approach is the first of its kind to be used in marine control systems design. Simulation results are presented and the performance of the nonlinear autopilot is compared with that of an existing Springer Linear Quadratic Gaussian (LQG) autopilot using standard system performance criteria. From the results it can be concluded the LCN autopilot out-performed that based on LQG techniques in terms of the selected criteria. Also it provided more energy saving control strategies and would thereby increase operational duration times for the vehicle during real-time missions.

Keywords

Unmanned Surface VehicleAutopilot DesignLinear Quadratic Gaussian ControlLocal Control Network
Type
Research Article
Information
The Journal of Navigation , Volume 65 , Issue 2 , April 2012 , pp. 281 - 301
Copyright
Copyright © The Royal Institute of Navigation 2012

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