Examinando por Materia "ANTENAS"

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  • Artículo de Publicación Periódica
    Analysis and design of a tilted rotor hexacopter for fault tolerance
    (IEEE, 2016) Giribet, Juan I.; Sanchez-Peña, Ricardo; Ghersin, Alejandro S.
    A proof is presented of how a hexagon-shaped hexacopter can be designed to keep the ability to reject disturbance torques in all directions while counteracting the effect of a failure in any of its motors. The method proposed is simpler than previous solutions, because it does not require change of the motor rotation direction or in-flight mechanical reconfiguration of the vehicle. It consists of tilting the rotor a small fixed angle with respect to the vertical axis. Design guidelines are presented to calculate the tilt angle to achieve fault-tolerant attitude control without losing significant vertical thrust. It is also formally proved that the minimum number of unidirectional rotating motors needed to have fault tolerance is 6 and that this can be achieved by tilting their rotors. This proof is essentially a control allocation analysis that recovers in a simple way a result already known: the standard configuration (without tilting the motors) is not fault tolerant. A simulation example illustrates the theory.
  • Tesis de maestría
    Antenas comerciales para enlaces pertenecientes al servicio fijo terrestre punto a punto: estudio de compatibilidad electromagnética y proyecto de marco regulatorio
    (2014) Hochman, Leonel Enrique; Muñoz, Claudio
    "La presente tesis establece una metodología completa para el desarrollo de un proyecto de Norma Técnica para homologación, selección y utilización de antenas directivas de reflector parabólico operando en las bandas de frecuencias comprendidas entre 335 MHz y unos 60 GHz. Dicha metodología comprende dos fases de estudio previas a la elaboración del documento normativo: 1) el relevamiento de las antenas comerciales y la modelización matemática de sus diagramas de radiación de referencia, y 2) el desarrollo de una metodología automatizada de cálculos de Compatibilidad Electromagnética para la obtención de un índice de eficiencia espectral para distintos tipos y dimensiones de antenas. Las antenas bajo estudio son las comercialmente conocidas como Ultra Alta Performance, Alta Performance, Estándar, Grilladas y de Plano Focal."
  • Ponencia en Congreso
    Autonomous vehicles for outdoor multidomain mapping
    (2018-06) Garberoglio, Leonardo; Moreno, Patricio; Mas, Ignacio; Giribet, Juan I.
    "In the last years, progress has been made attempting to replace a unique, complex and expensive vehicle equipped with several sensors such as LIDAR, RGB cameras, thermal sensor, etc. with a group of small vehicles, each of them carrying one sensor. There are several advantages of these segmented architectures, for instance this allows a reduction in the cost of the vehicles (several small vehicles can be less expensive than one big vehicle), the flexibility to choose for a mission only those vehicles with the appropriate sensors, the robustness of the system since it can acquire information even if one vehicle fails, among others. The advantage of segmented architectures is even more noticeable if the vehicles carrying those different sensors, have different characteristics or environments for operations, e.g. aerial, terrestrial or aquatic vehicles. In this work, we present the experimental results obtained with an ASV (Autonomous Surface Vehicle) and a UAV (Unmanned Aerial Vehicle) that cooperate to obtain a topographic survey of the terrain. The ASV is equipped with a LIDAR, meanwhile the UAV is equipped with a monocular RGB camera. The data acquired is post-processed in order to obtain a detailed map of the coastline of a creek and the surrounding area."
  • Ponencia en Congreso
    Set-up of a method for people-counting using images from a UAV
    (2019-07-02) Parisi, Daniel; Giribet, Juan I.; Pose, Claudio D.; Mas, Ignacio
    "We present a new method for obtaining the positions of each person attending an outdoor gathering. From this information it is possible to calculate the density field and the number of people. A dual-camera (visible + infrared (IR)) is mounted on an unmanned aerial vehicle (UAV). In this work, we only use the IR channel and present an initial set-up and calibration of the system along with the characterization of a small group of people."