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Implementation of an internet-based remote controller with guaranteed exponential stabilization
KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
2008 (English)In: Proceedings of the World Congress on Intelligent Control and Automation (WCICA), 2008, 4063-4068 p.Conference paper (Refereed)
Abstract [en]

In this article, an Internet-based remote control system is designed and implemented. The communication is based on the Master-Slave structure. The Master PC communicates with the Slave from about 40km away by UDP protocol. In order to guarantee the Master and Slave clocks to be synchronized, the NTP (Network Time Protocol) is used in both sides. The packets are sent together with time-stamps. The controller design (master) relies on a remote observer that achieves a state prediction of the application (slave), despite the variable communication delays. The Slave comprises a PC and a robot Miabot of Merlin company. The protocol Bluetooth is used between the local PC and the robot. Internet-based remote systems are subject to variable time delays (including communication and data-sampling delays) and data packets losses (due to the unstable Internet network). We have continuously tested the RTT (round-trip-time) between the two PCs in the daytime and nighttime by the protocol ICMP (Internet Control Message). From these tests, an evaluation of the maximal time delay is obtained. Our structure allows one to guarantee an exponential stabilization performance, which is proven via a Lyapunov-Krassovski functional technique and involves the estimated delay upperbound. This means that the guaranteed decay rate is computed (via some LMI optimization) in relation to some maximal value of the communication delays. Of course, for greater delay values, the performance cannot be guaranteed anymore and an alternative solution has to be considered. In our system, we give a command for the robot to stop until the communication comes back to a sufficient quality.

Place, publisher, year, edition, pages
2008. 4063-4068 p.
, Proceedings of the World Congress on Intelligent Control and Automation (WCICA)
Keyword [en]
Bluetooth, Cellular telephone systems, Communication, Control systems, Control theory, Data communication systems, Decay (organic), Delay control systems, Industrial engineering, Intelligent control, Internet, Laws and legislation, Linear control systems, Microcomputers, Observability, Robotics, Robots, Stabilization, Time delay, Communication delays, Control and automation, Controller designs, Data packets, Decay rates, Delay values, Exponential stabilization, Functional technique, Internet control, LMI optimization, Lyapunov, Master-slave, Network Time Protocol, Remote control systems, Remote controllers, Remote systems, Round-Trip Time, State prediction, Time delaying, UDP protocol, Upper bounds, Variable communication, Internet protocols
National Category
Control Engineering Computer Science
URN: urn:nbn:se:kth:diva-154326DOI: 10.1109/WCICA.2008.4594512ISI: 000259965703070ScopusID: 2-s2.0-52149088145ISBN: 9781424421145OAI: diva2:756808
7th World Congress on Intelligent Control and Automation, WCICA'08, 25 June 2008 through 27 June 2008, Chongqing

QC 20141020

Available from: 2014-10-20 Created: 2014-10-17 Last updated: 2014-10-20Bibliographically approved

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Seuret, Alexandre
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Automatic ControlACCESS Linnaeus Centre
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