Lionel Cordesses

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Visual servoing requires an object in the field of view of the camera, in order to control the robot evolution. Otherwise , the virtual link is broken and the control loop cannot continue to be closed. In this paper, a novel approach is presented in order to guarantee that the object remains in the field of view of the camera during the whole robot motion.(More)
Oscillators are the subjects of intensive research. From Colpitts oscillators to phase locked loops, methods have been proposed to improve stability, frequency resolution, and spectral purity. Among the all-digital approaches, direct digital frequency synthesis are now available as integrated circuits and they output waveforms up to hundreds of megahertz.(More)
Direct digital synthesis (DDS) is a useful tool for generating periodic waveforms. In this two-part article, the basic idea of this synthesis technique is presented and then focused on the quality of the sinewave a DDS can create, introducing the SFDR quality parameter. Next effective methods to increase the SFDR are presented through sinewave(More)
Precision agriculture involves very accurate f a r m vehicle control along recorded paths, which are not necessarily straight lines. In this paper, we investigate the possibility of achieving this task with a CP-DGPS as the unique sensor. T h e vehicle heading is derived according t o a Kalman state reconstructor, and a nonlin-ear velocity independent(More)
An accurate localization system (Carrier Phase diierential GPS receiver) allows the design and implementation of an absolute vehicle guidance system. The preliminary work, presented in this paper, was aimed at validating the use of one GPS receiver in a vehicle guidance system, without any orientation sensor. We designed and implemented a non linear control(More)
BIOGRAPHY Lionel Cordesses is a Ph.D. student in robotics at Cemagref and LASMEA. He is an electrical engineer from the CUST since 1997. He also received his master's degree in robotics in 1997, Blaise Pascal University, France. His research interests include Automatic Guided Vehicles (AGV) using GPS. he has been assistant professor of Computer Science at(More)
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