Persona: Poyatos Martinez, David
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Instituto Nacional de Técnica Aeroespacial
El Instituto Nacional de Técnica Aeroespacial es el Organismo Público de Investigación (OPI) dependiente del Ministerio de Defensa. Además de realizar actividades de investigación científica y de desarrollo de sistemas y prototipos en su ámbito de conocimiento, presta servicios tecnológicos a empresas, universidades e instituciones.
El INTA está especializado en la investigación y el desarrollo tecnológico, de carácter dual, en los ámbitos de la Aeronáutica, Espacio, Hidrodinámica, Seguridad y Defensa.
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Poyatos Martinez
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David
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37 resultados
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Publicación Restringido Performance analysis of the Particle Swarm Optimization algorithm when applied to direction of arrival estimation(Institute of Electrical and Electronics Engineers, 2009-09-18) Errasti Alcalá, B.; Escot Bocanegra, D.; Poyatos Martinez, David; Montiel, I.; Instituto Nacional de Técnica Aeroespacial (INTA)Direction of arrival (DOA) estimation is a well known problem involved in different applications. The latest of these applications have greater constraints which make necessary new efforts in estimating the DOA with fewer snapshots. In that sense, this paper presents an iterative method based on particle swarm optimization that solves the problem with a single snapshot. The performance of this algorithm is analyzed and shown with numerical results under different scenarios. Conclusions are also provided.Publicación Acceso Abierto Soft Computing Techniques for Free-Space Measurements of Complex Dielectric Constant(River Publishers Journals, 2009-06-05) Escot Bocanegra, D.; Poyatos Martinez, David; Patricio, M. A.; Instituto Nacional de Técnica Aeroespacial (INTA)A novel method for estimating the dielectric properties of materials by applying different soft computing techniques is presented. Dielectric properties allow us to know other material characteristics such as moisture content, bio-content, chemical concentration, etc., which are of great importance on industrial or science fields. In this paper, we present a free-space measurement method along with soft computing techniques, such as Genetic Algorithms (GA) and Particle Swarm Optimization (PSO), and other approaches like Artificial Neural Networks (ANN), for estimating the dielectric properties of materials. The proposed method is validated by measurements and synthetic materials, which were generated to test the performance of these soft computing algorithms.Publicación Restringido UAVEMI project: Numerical and experimental EM immunity assessment of UAV for HIRF and lightning indirect effects(Institute of Electrical and Electronics Engineers, 2016-07-07) García, Salvador G.; Silva, F.; Escot Bocanegra, D.; Pascual, Enrique; Pantoja, M. F.; Riu, Pere J.; Añón Cancela, M.; Álvarez, J.; Cabello, M.; Pous, M.; Fernández, Sergio; Trallero Vela, R.; Poyatos Martinez, David; Nuño, L.; Instituto Nacional de Técnica Aeroespacial (INTA)The UAVEMI project, funded by the Spanish Ministry of Economy and Competitiveness, gathers a consortium formed by several research and development institutions and one industrial partner. The main goal is to develop innovative experimental and numerical approaches for the assessment of the electromagnetic compatibility of unmanned air vehicles, under high intensity radiated fields, lightning indirect effects and non-nuclear electromagnetic pulses. This contribution describes the capabilities currently being developed under the project.Publicación Restringido Application of particle swarm optimization (PSO) to single-snapshot direction of arrival (DOA) estimation(Institute of Electrical and Electronics Engineers, 2007-12-06) Escot Bocanegra, D.; Poyatos Martinez, David; González, Iván; Sáez de Adana, F. M.; Cátedra, M. F.; Instituto Nacional de Técnica Aeroespacial (INTA)This paper attempts to examine the feasibility of using an heuristic bio-inspired algorithm in DOA estimation. Specifically, particle swarm optimization (PSO) (Kennedy, et. al., 1995)Publicación Restringido BIANCHA: A spherical indoor facility for bistatic electromagnetic tests(Institute of Electrical and Electronics Engineers, 2017-01-05) López Rodríguez, P.; Hernán Vega, O.; Poyatos Martinez, David; Escot Bocanegra, D.; Ministerio de Economía y Competitividad (MINECO)BIANCHA (BIstatic ANechoic CHAmber) is a singular facility located at the premises of the National Institute for Aerospace Technology (INTA), Spain. It was devised to enable both monostatic and bistatic automatic positioning and, therefore, permits to perform a wide variety of electromagnetic tests. In this regard, it is worth noting that in the last years, a renewed interest has arisen in bistatic radar. Some of the main reasons behind this renaissance are the recent advances in passive radar systems added to the advantages that bistatic radar can offer to detect stealth platforms. On the other hand, with the aim of developing new aeronautic materials with desired specifications, research on the electromagnetic properties of materials has also attracted much attention, demanding engineers and scientists to assess how these materials behave in the presence of electromagnetic fields. Consequently, this paper introduces BIANCHA and demonstrates its applicability for these purposes by presenting results of tests for two different applications: a bistatic scattering analysis of scaled aircraft targets and the extraction of the electromagnetic properties of composite materials utilized in an actual aeronautical platform.Publicación Restringido RCS Analysis of a Configurable Mock-Up Cavity With Blade Motion Capability(Institute of Electrical and Electronics Engineers, 2009-02-24) Poyatos Martinez, David; Escot Bocanegra, D.; Fernández Recio, R.; Montiel Sánchez, I.; Instituto Nacional de Técnica Aeroespacial (INTA)The scattering behavior and simulation of cavities are still being studied by several research groups. In this paper, a simplified jet-engine model has been manufactured and measured under different configurations, such as straight or curved blades, different fixed blades position, and free motion capability at adjustable speed. These measurements can be used to analyze the response of cavities as well as radar cross-section reference data for validating existing and future prediction codes.Publicación Acceso Abierto Comparing Open Area Test Site and Resonant Chamber for Unmanned Aerial Vehicle's High-Intensity Radiated Field Testing(Institute of Electrical and Electronics Engineers, 2018-01-18) Fernández Romero, S.; López Rodríguez, P.; Escot Bocanegra, D.; Poyatos Martinez, David; Añón Cancela, M.; Ministerio de Economía y Competitividad (MINECO); Agencia Estatal de Investigación (AEI)Open area test sites (OATS) have been traditionally employed for aircraft electromagnetic compatibility certification tests because of the large size of these items. In this regard, unmanned aerial vehicles (UAVs) have emerged in the last years and, albeit being sometimes notably smaller, yet they have to accomplish for the same certification process. This paper investigates into the possibility of using a reverberation chamber for performing two aircraft low-level coupling tests, namely, low-level direct drive and low-level swept fields, and compares the results with those obtained in an OATS, in both cases using a representative part of a UAV.Publicación Acceso Abierto Class Identification of Aircrafts by Means of Artificial Neural Networks Trained with Simulated Radar Signatures.(The EM Academy, 2011-05-27) Jurado Lucena, A.; Montiel, I.; Escot Bocanegra, D.; Poyatos Martinez, David; Instituto Nacional de Técnica Aeroespacial (INTA)Non-Cooperative Target Recognition (NCTR) of aircrafts from radar measurements is a formidable problem that has drawn the attention of engineers and scientists over the last years. NCTR techniques typically involve a database with a huge amount of information from different known targets and a reliable identification algorithm able to highlight the likeness between measured and stored data. This paper uses High Resolution Range Profiles produced with a high-frequency software tool to train Arti cial Neural Networks for distinguishing between different classes of aircrafts. Actual data from the ORFEO measurement campaign are used to assess the performance of the trained networks.Publicación Acceso Abierto New Benchmark Radar Targets for Scattering Analysis and Electromagnetic Software Validation(The EM Academy, 2008-05-14) Escot Bocanegra, D.; Poyatos Martinez, David; Fernández Recio, R.; Jurado Lucena, A.; Montiel, I.; Instituto Nacional de Técnica Aeroespacial (INTA)A validation process, in which simulations and measurements are compared, is necessary to have confidence in the results obtained by numerical methods that solve scattering problems. This paper presents Radar Cross Section (RCS) measurements of new targets suitable for electromagnetic software comparison and validation. These measurements can be used as an RCS reference data for testing existing and future codes, as well as for the analysis of the scattering mechanisms.Publicación Acceso Abierto Comparison of Metal-Backed Free-Space and Open-Ended Coaxial Probe Techniques for the Dielectric Characterization of Aeronautical Composites(Multidisciplinary Digital Publishing Institute (MDPI), 2016-06-24) López Rodríguez, P.; Escot Bocanegra, D.; Poyatos Martinez, David; Weinmann, F.; Instituto Nacional de Técnica Aeroespacial (INTA); Ministerio de Economía y Competitividad (MINECO); Agencia Estatal de Investigación (AEI)The trend in the last few decades is that current unmanned aerial vehicles are completely made of composite materials rather than metallic, such as carbon-fiber or fiberglass composites. From the electromagnetic point of view, this fact forces engineers and scientists to assess how these materials may affect their radar response or their electronics in terms of electromagnetic compatibility. In order to evaluate this, electromagnetic characterization of different composite materials has become a need. Several techniques exist to perform this characterization, all of them based on the utilization of different sensors for measuring different parameters. In this paper, an implementation of the metal-backed free-space technique, based on the employment of antenna probes, is utilized for the characterization of composite materials that belong to an actual drone. Their extracted properties are compared with those given by a commercial solution, an open-ended coaxial probe (OECP). The discrepancies found between both techniques along with a further evaluation of the methodologies, including measurements with a split-cavity resonator, conclude that the implemented free-space technique provides more reliable results for this kind of composites than the OECP technique
