Calderón

Calderón es el repositorio institucional del CUD (Centro Universitario de la Defensa) en la ENM (Escuela Naval Militar). El CUD, siguiendo las iniciativas Open Access, pone a disposición de la Comunidad este repositorio donde se da acceso a la producción investigadora, principalmente en forma de Trabajos Fin de Grado, pero también Trabajos Fin de Máster, y otros artículos de investigación publicados por el personal docente e investigador del Centro.

Algunos de los documentos publicados en este repositorio tienen restringido el acceso. Para solicitar su consulta, o para plantear cualquier duda respecto a los contenidos de este respositorio, puede:
  • Enviar un correo electrónico a biblioteca@cud.uvigo.es.
  • Llamar por teléfono al 986 80 49 89.

Communities in Calderón

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Now showing 1 - 5 of 5

Recent Submissions

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    Fuzzy Logic Intelligent Decision Support System for Safety of Maritime Navigation Based on COLREG.
    (XII Jornadas de Cloud Computing, Big Data & Emerging Topics, La Plata (Argentina), 2024-06-27) Valles Cancela, José Ignacio; Olivas Varela, José Ángel; González Prieto, José Antonio
    The main objective of this work is the development of an intelligent decision support system based on soft computing and fuzzy logic that incorporates considerations from the Regulations for Preventing Collisions at Sea (COLREG) and navigation experts knowledge, able to face demanding and complex situations in an evolutive maritime environment, building a comprehensive understanding of the situation and providing explainable and interpretable recommendations to ships’ watchkeeping officers or performing actions if integrated in autonomous ships navigation systems.
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    Evaluador inteligente basado en lógica difusa para simuladores de navegación.
    (X Congreso Nacional de I+D en Defensa y Seguridad (DESEI+D), Cartagena., 2023-11-16) Valles Cancela, José Ignacio; Olivas Varela, José Ángel; González Prieto, José Antonio
    Este trabajo se centra en el desarrollo de un sistema de evaluación inteligente, que pueda ser integrado en los simuladores de navegación que la Armada emplea en sus centros de formación,con el objetivo de apoyar a los instructores en el proceso de evaluación de los alumnos. Para lograr este objetivo se propone emplear técnicas de lógica difusa y razonamiento aproximado para, a partir de los datos obtenidos de las simulaciones y en base al conocimiento experto de los instructores, desarrollar un evaluador inteligente para el simulador de navegación de la Escuela Naval Militar (ENM).
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    Beacon-Based Phased Array Antenna Calibration for Passive Radar
    (MDPI (Multidisciplinary Digital Publishing Institute), 2025-01-30) González-Coma, José P.; Nocelo López, Rubén; Núñez-Ortuño, José M; Troncoso-Pastoriza, Francisco
    Passive radar has drawn a lot of attention due to its applications across military and civilian sectors. Under this working paradigm, the utilization of antenna arrays is instrumental, as it increases the signal quality and enables precise target positioning. These promising features rely, however, on the precise calibration of the antenna array, as the different hardware components introduce impairments that compromise the beamforming capabilities of the system. We propose a technique that employs a low-power external beacon signal to produce precise information about the target location, avoiding the angular ambiguities present in other solutions in the literature. The experimental results demonstrate the method’s ability to effectively correct the amplitude and phase inconsistencies while compensating for frequency drifts, enabling beamforming capabilities and direction-of-arrival estimation. Among the tested beacon waveforms, the pseudo-random noise-based signals proved the most robust, especially in low-power scenarios. Additionally, the method was validated in a passive radar setup, where it successfully detected a vessel using opportunistic signals. These findings highlight the method’s potential to enhance passive radar performance while maintaining a low probability of detection, a key aspect in military applications, as well as its applicability to civilian purposes, such as infrastructure monitoring, environmental observation, and traffic management.
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    Slow Fluid Antenna Multiple Access With Multiport Receivers
    (Institute of Electrical and Electronics Engineers (IEEE), 2026-01-06) González-Coma, José P.; López-Martínez, F. Javier
    We investigate whether equipping fluid-antenna (FA) receivers with multiple ( L >1 ) radiofrequency (RF) chains can improve the performance of the slow fluid-antenna multiple access (FAMA) technique, which enables open-loop connectivity with channel state information (CSI) available only at the receiver side. We analyze the case of slow-FAMA users equipped with multiport receivers, so that L ports of the FA are selected and combined to reduce interference. We show that a joint design of the port selection matrix and the combining vector at each receiver yields significant performance gains over reference schemes, demonstrating the potential of multiport reception in FA systems with a limited number of RF chains.
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    Leakage Subspace Precoding and Scheduling for Physical Layer Security in Multi-User XL-MIMO Systems
    (Institute of Electrical and Electronics Engineers (IEEE), 2023-02-13) Anaya-López, Gonzalo J; González-Coma, José P.; López-Martínez, F. Javier
    We investigate the achievable secrecy spectral efficiency in a multi-user extra-large multiple-input multiple-output (XL-MIMO) system. In these beyond-5G scenarios, seen as the natural evolution of conventional massive MIMO systems, the distances from the mobile users to the base station become comparable to the antenna array dimensions. We show that the consideration of spherical-wavefront propagation inherent to these set-ups is beneficial for physical-layer security, as it provides immunity against eavesdroppers located in similar angular directions that would otherwise prevent secure communication under classical planar-wavefront propagation. A leakage subspace precoding strategy is also proposed for joint secure precoding and user scheduling, which allows to improve the secrecy spectral efficiency over a 40% compared to conventional zero-forcing methods, under different eavesdropper collusion strategies.