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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56 resultados
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Mostrando 1 - 10 de 56
Publicación Restringido Electromagnetic Characterization of Corner Reflectors for Calibration of SAR Technology(IEEE, 2025-05-21) Ramos Somolinos, David; Sánchez Sánchez, Gema; Auñón Marugán, Alicia; Gimeno Martinez, Nuria; Casal Vázquez, Nuria; Cuerda Muñoz, Juan Manuel; Poyatos Martinez, David; Plaza Gallardo, BorjaSynthetic aperture radar (SAR) technology is present in a variety of Earth observation missions, like PAZ satellite, gathering information in such important fields as national defence, high resolution mapping environmental research, etc. To guarantee correct and accurate data, the SAR system must be appropriately calibrated. While there are several means to achieve this, passive elements such as corner reflectors are frequently used for the task. In this work, three calibration corner reflectors are studied: a reference steel model, an aluminium prototype manufactured according to a new geometry and a polylactic acid (PLA) model whose surface is coated with conductive nickel paint. The radar cross-section (RCS) of these reflectors is simulated using Ansys HFSS software and measured in the bistatic anechoic chamber (BIANCHA) belonging to the National Institute of Aerospace Technology (INTA). Finally, these results are compared with each other and with the theoretical RCS of the trihedrals.Publicación Acceso Abierto Diseño, simulación y medidas de un UCAV de baja observabilidad(Ministerio de Defensa, 2023-11) Ruiz Carrasco, Jose Raimundo; Guzmán Fernández-Fígares, Javier; Rodríguez Amor, José Roberto; Plaza Gallardo, Borja; Poyatos Martinez, DavidEl presente artículo expone el trabajo realizado por el INTA en el Task Group NATO/STO/SET-252 cuyo fin es diseñar y fabricar un modelo de validación de un UCAV (vehículo aéreo de combate no tripulado) representativo en términos de complejidad geométrica teniendo en cuenta el uso de materiales para la reducción de los principales mecanismos de dispersión electromagnética. La computación electromagnética (CEM) es una herramienta de ingeniería crucial en el proceso de diseño general y se utiliza para identificar los centros de dispersión, para evaluar el efecto de los recubrimientos o distorsiones como la rugosidad de la superficie y, finalmente, para determinar la firma de radar del modelo. Con respecto al creciente número de vehículos autónomos no tripulados, los resultados no solo son relevantes para el ámbito militar, sino también son valiosos para el control del tráfico aéreo civil y la vigilancia aérea.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 techniquePublicación 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 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 Aplicación de técnicas de impresión 3D al diseño y fabricación de superficies selectivas en frecuencia(Universidad de Sevilla, 2019-09-06) Muñoz Rebate, I.; Martín Iglesias, Santiago; Plaza Gallardo, Borja; Poyatos Martinez, David; Agencia Estatal de Investigación (AEI)This paper presents the application of 3D printing (or additive manufacturing) to the design and fabrication of a frequency selective surface (FSS). In particular, the periodic structure has been created using fused deposition modeling (FDM) technology. Along the paper, a complete development method is described, starting from the electromagnetic (EM) characterization of available materials and the selection of the most suitable one, followed by the design, analysis and optimization of the geometry via EM simulations. Finally a test specimen is implemented and measured in an anechoic chamber. In this case, an innovative material is used: a graphene filled thermoplastic that is able to conduct electricity. The measurement results agree with the simulations, validating the approach and encouraging the use of this 3D printing technique for the manufacturing of radiofrequency devices.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 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 Restringido Design of a planetary protection cover for EMC testing of a spacial magnetic sensor(Institute of Electrical and Electronics Engineers, 2019-10-17) Fernández Romero, S.; Parrondo, María Concepción; Díaz Michelena, Marina; Muñóz Rebate, I.; León Calero, Marina; Martín Iglesias, Santiago; Plaza Gallardo, Borja; Escot Bocanegra, D.; Poyatos Martinez, David; Jiménez Lorenzo, María; López Sanz, Daniel; Ministerio de Economía y Competitividad (MINECO); Agencia Estatal de Investigación (AEI)This paper explains the research process carried out for the development and manufacture of the planetary protection cover for carrying out the electromagnetic compatibility (EMC) tests of the an-isotropic magneto-resistance (AMR) sensor of the ExoMars 2020 mission. This mission has strict bioburden requirements. The electromagnetic properties of several materials have been analyzed in order to study their transmission coefficient and the innovation of this project is the use of fused deposition modeling (FDM) technology as manufacturing method. Additive manufacturing is presented as a promising technology in the field of radiofrequency since it can use a wide range of polymeric materials (thermoplastics) with low transmission coefficient. Observing the electromagnetic (EM) characterization results, it was decided to manufacture a protective cover using FDM technology, because it allows control over the grounding of the instrument and facilitates the integration, cleaning and protection against impacts during the manipulation, with great versatility and low cost. Finally, the cover has been verified during the acceptance EMC tests of the flight model AMR instrument.
