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Tijuana, Mexico

Tlelo-Cuautle E.,National Institute of Astrophysics, Optics and Electronics | Ramos-Lopez H.C.,Instituto Tecnologico de Tuxtla Gutierrez | Sanchez-Sanchez M.,University of Papaloapan | Pano-Azucena A.D.,Polytechnic University of Puebla | And 3 more authors.
Journal of Electrical Engineering | Year: 2014

Terrain exploration robots can be of great usefulness in critical navigation circumstances. However, the challenge is how to guarantee a control for covering a full terrain area. That way, the application of a chaotic oscillator to control the wheels of an autonomous mobile robot, is introduced herein. Basically, we describe the realization of a random number generator (RNG) based on a double-scroll chaotic oscillator, which is used to guide the robot to cover a full terrain area. The resolution of the terrain exploration area is determined by both the number of bits provided by the RNG and the characteristics of step motors. Finally, the experimental results highlight the covered area by painting the trajectories that the robot explores. © 2014 FEI STU.

Tlelo-Cuautle E.,National Institute of Astrophysics, Optics and Electronics | Carbajal-Gomez V.H.,National Institute of Astrophysics, Optics and Electronics | Obeso-Rodelo P.J.,IPN CITEDI | Rangel-Magdaleno J.J.,National Institute of Astrophysics, Optics and Electronics | Nunez-Perez J.C.,IPN CITEDI
Nonlinear Dynamics | Year: 2015

The hardware realization of a chaotic communication system from the description of continuous-time multi-scroll chaotic oscillators is introduced herein by using field-programmable gate arrays (FPGA). That way, two multi-scroll chaotic oscillators generating 2 and 6 scrolls are synchronized by applying Hamiltonian forms and observer approach. The synchronized master-slave topology is used to implement a secure communication system by adding chaos to an image at the transmission stage and by subtracting chaos at the recover stage. The FPGA realization begins by applying numerical methods to solve the system of equations describing the whole chaotic communication system. Further, the replacement of multipliers by single constant multiplication blocks reduces the use of hardware resources and accelerates the processing time as well. Using chaotic oscillators with 2 and 6 scrolls, three kinds of images are processed: one in black and white and two in gray tones. Finally, the experimental results confirm the appropriateness on realizing chaotic communication systems for image processing by using FPGAs. © 2015, Springer Science+Business Media Dordrecht.

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