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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Mostrando 1 - 10 de 37
Publicación Restringido Methodology to Achieve Accurate Non Cooperative Target Identification Using High Resolution Radar and a Synthetic Database(Springer Link, 2010-07-02) Jurado Lucena, A.; Errasti Alcalá, B.; Escot Bocanegra, D.; Fernández Recio, R.; Poyatos Martinez, David; Montiel, I.; Instituto Nacional de Técnica Aeroespacial (INTA)In the last few years, there is a great interest in developing an identification system capable to make a reliable classification of aircrafts into different groups (friendly, hostile or neutral). Depending on the context in which these systems are deployed, incorrect identification may lead to serious problems, such as fratricide or engagement of civilian aircrafts. Different techniques have been researched to face this problem, but non-cooperative ones have awakened more interest because they do not require aircraft collaboration. Non Cooperative Target Identification (NCTI) using radar is a complex task, mainly due to the fact that a database of possible targets is needed. To populate this database, Radar Cross Section (RCS) predictions produced by computer simulation seem to be the most feasible way to perform this task, since measurements alone cannot cover the vast range of targets, configurations and required aspect angles. These predictions are typically performed in the frequency domain and a specific processing must be done to obtain both High Resolution Range Profiles (HRRPs) and 2D Inverse Synthetic Aperture Radar (2D-ISAR) images. This paper shows a methodology to face the NCTI task, which use both synthetic HRRPs and 2D-ISAR to achieve an accurate identification.Publicación Acceso Abierto Characterization of Joints between Carbon Fiber Composite Parts Using a Microstrip Transmission Line Method(Multidisciplinary Digital Publishing Institute (MDPI), 2021-02-06) Plaza Gallardo, Borja; López, Daniel; Poyatos Martinez, David; Agencia Estatal de Investigación (AEI)The electromagnetic performance of aerial platforms, which are composed mostly of nonmetallic materials, is a subject of great interest at present time. The behavior of this type of composite structure against electromagnetic environmental effects (E3), such as lightning, is not well-studied as in the case of metalic structures. The purpose of this article is to characterize the joints present in aerial platforms constructed mainly of nonmetallic composite materials. The study of these joints is fundamental because electrical discontinuities or preferential routes can produce changes in the electromagnetic behavior of an aircraft. The proposed measurement system for the characterization of these joints is a microstrip line. The flexibility of the test setup allows for evaluation of different joints in carbon fiber composite (CFC) samples with a different number of plies. Additionally, approximated models of the behavior of the joints as well as the detection of possible defects in the joining process are reported.Publicación Restringido Indoor 3D Full Polarimetric Bistatic Spherical Facility for Electromagnetic Tests(Institute of Electrical and Electronics Engineers, 2010-08-05) Escot Bocanegra, D.; Poyatos Martinez, David; Aguilar Rosado, Juan Angel; Montiel, I.; González, Iván; Sáez de Adana, F. M.; Instituto Nacional de Técnica Aeroespacial (INTA)A new indoor facility for electromagnetic measurements has been developed and built at the Detectability and Electronic Warfare Laboratory, INTA, Spain. The system was designed to extend the previous capabilities so that not only monostatic but also bistatic radar cross section (RCS) tests could be easily conducted. Due to limited space, far-field radar cross sections in the system are restricted to small targets, but this layout will allow the researchers to investigate ReS near-field-to-far-field transformations. The system was also conceived to be versatile enough to carry out other tests, such as near-field antenna measurements, material-absorption measurements, and electromagnetic characterization of materials. The paper describes the novel concept behind the facility, and presents some preliminary measurement results on different applications.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 Restringido Study of the scattering mechanisms of a set of conospheres(Institute of Electrical and Electronics Engineers, 2010-05-12) Fernández Recio, R.; Jurado Lucena, A.; Errasti Alcalá, B.; Escot Bocanegra, D.; Poyatos Martinez, David; Instituto Nacional de Técnica Aeroespacial (INTA)This paper presents Radar Cross Section (RCS) measurements and predictions of a set of three conospheres suitable for electromagnetic software validation. These measurements can be used as a RCS reference data for testing existing and future codes, as well as for the analysis of the scattering mechanisms present in this kind of objects. The association between the scattering mechanism and its response is specially valuable in a validation process, in which simulations and measurements are compared, to identify the possible weak points of the electromagnetic tool.Publicación Restringido Limitations in the Shielding Effectiveness Measurement Methods for Carbon Fiber Composites(Institute of Electrical and Electronics Engineers, 2021-04-12) Plaza Gallardo, Borja; Gómez de Francisco, Patricia; Fernández Romero, S.; Muñoz Rebate, I.; Ramos Somolinos, D.; Poyatos Martinez, David; Agencia Estatal de Investigación (AEI)Novel materials, as multi-ply carbon fiber composites (CFC), are increasingly used in the industry due to their outstanding mechanical properties in relation to their weight. In this regard, from the standpoint of electromagnetic compatibility (EMC), shielding effectiveness (SE) is a key parameter that often determines the scope for application of a given material. This article addresses the application of two complementary standards, ASTM D4935 and IEC 61000-4-21, to the SE measurement of different CFC test samples with more than 10 layers and a very large expected shielding. The analysis of the limitations encountered and the description of applied improvements on the traditional measurement procedures on each method are also included, showing promising results. On the other hand, there are alternative methods to evaluate the SE of CFC based on their DC square resistance. Consequently, and forthe shake of completeness, a novel setup for high precision measurement of the DC square resistance of CFC samples is also described along the article.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 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 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 Coupling Analysis Under Ligthning Indirect Effects For Cable Bundles With Different Ground Plates In Unmanned Aerial Vehicles(Institute of Electrical and Electronics Engineers, 2021-10-19) Ramos Somolinos, D.; Morales Blanco, C.; López Sanz, Daniel; Plaza Gallardo, Borja; Poyatos Martinez, David; Ministerio de Ciencia e Innovación (MICINN); Agencia Estatal de Investigación (AEI)It is increasingly common in aerospace industries to take advantage of novel composite materials in their manufacturing processes to improve performance and reduce costs. Obtaining the electromagnetic (EM) characterization of these materials or a combination of them is essential to ensure safety and EM compatibility.In this paper, a laminate of the central fuselage of an aircraft developed at INTA is recreated. This aircraft is called MILANO and it is mostly made of Carbon Fiber Composite (CFC). The same material is used for the laminate. Besides, another metallic plate is built in order to compare the performance of the former one with respect to a Perfect Electric Conductor (PEC). The main goal of this work is studying the coupling between the cable bundles embedded in the MILANO and how is this affected by the different materials of the ground plate (metal and CFC). Two kind of tests are carried out: S-parameters measurents and injection of Lightning Indirect Effect (LIE) waveforms. S-parameters results are then obtained through simulation too and compared with both the metallic and the CFC sample.
