About
38
Publications
11,091
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
156
Citations
Introduction
Skills and Expertise
Current institution
Publications
Publications (38)
Every year, more than 1500 containers are lost around the world. These accidents are increasingly more common due to the boom of the shipping industry, presenting serious consequences for marine ecosystems and maritime navigation. This problem has alerted various international organisms to regulate these catastrophes, incorporating new regulations...
This paper presents a 360º phase detector in the 2-18 GHz frequency band (160% relative bandwidth) that uses a fixed delay line as a phase shifter and a double multiplication, in-phase and out-of-phase, between the input signals. Initially, several classic 90º power splitter designs are analyzed under the new perspective that they can be used when...
This paper presents a new procedure for phase detector measurements that allows the use of generators that share a 10 MHz reference oscillator but do not synchronize in phase, in other words, quasi-synchronized RF generators. The objectives are taking advantage of the benefits of using two generators but recovering lower-cost generators that have w...
El proyecto DILCOMAR (Detección, Identificación y Localización de COntenedores extraviados en el MAR) plantea el uso de las comunicaciones AIS (Automatic Identification System) y VDES (VHF Data Exchange System) para implementar un sistema de telemetría para detectar e identificar contenedores perdidos en el mar, así como un sistema de posicionamien...
This article presents a radio frequency system that can be used to perform precise vertical landings of drones. The system is based on the three-way phase shift detection of a signal transmitted from the landing point. The antenna system is designed by taking into account parameters such as landing tracking area, analog-to-digital converter (ADC) r...
Forest fires are one of the main threats nowadays due to the consequences they have for the society and economy. During a wildfire, to obtain information about the status and evolution of the flames, communications systems become a key aspect in extinguishing the flames. These communications systems must provide real-time information to be useful....
The continuous development of thermographic technology has led to the overall improvement of instruments used in medicine, surveillance, or military systems. However, thermographic imaging cameras still have a high cost compared to other alternatives on the market, such as visible light cameras and a much lower spatial resolution. Superresolution i...
This article presents an amplitude and 360° phase shift array measurement system. The basic cell of the measurement system uses a novel amplitude and phase detector based on switched dual multipliers. The phase shift measurement is characterized using an analog phase detector (mixer), detecting a maximum range of ±90°, and a double multiplication o...
This paper presents a circuit for precise vertical landing of drones based on a three phase-shifts detection of a single frequency transmitted from the landing point. The circuit can be considered as a new navigation sensor that assists in guidance corrections for landing at a specific point. The circuit has three inputs to which the signal transmi...
The AIS (Automatic Identification System) has become one of the most popular maritime communications systems in the world, allowing the data exchange and identification among vessels to avoid collisions at sea. In spite of the uncountable virtues of this system, security and channel saturation challenges have motivated the development of a new vers...
The use of drones or UAVs (unmanned aerial vehicles) for commercial or leisure purposes is increasingly common in our society. However, UAVs can also be used for other purposes that may compromise the privacy and safety of the population. For this reason, it has become necessary to enable the monitoring and identification of UAVs through a radio sy...
A new simulation technique to obtain the synchronized steady-state solutions existing in coupled oscillator systems is presented. The technique departs from a semi-analytical formulation presented in previous works. It extends the model of the admittance function describing each individual oscillator to a piecewise linear one. This provides a globa...
Thermographic imaging has been the preferred technology for the detection and tracking of wildfires for many years. Thermographic cameras provide some very important advantages, such as the ability to remotely detect hotspots which could potentially turn into wildfires if the appropriate conditions are met. Also, they can serve as a key preventive...
This letter presents a 360° phase detector cell for performing phase-shift measurements on multiple output systems. An analog phase detector, capable of detecting a maximum range of ± 90°, has been used to perform a double multiplication of two signals, both in-phase and phase-shifted. The proposed solution broadens the frequency range beyond other...
En este trabajo se presenta el proyecto de Innovación Educativa Acción Tutorial on-line, concedido al Grupo de Innovación Educativa en Sistemas de Telecomunicación de la Universidad de Las Palmas de Gran Canaria, que tiene como objetivos el proporcionar un estudio sobre herramientas virtuales para tutorías online en ingeniería y usar la herramienta...
The Automatic Identification System (AIS) standard is encompassed within the Global Maritime Distress and Safety System (GMDSS), in force since 1999. The GMDSS is a set of procedures, equipment and communication protocols designed with the aim of increasing the safety of sea crossings, facilitating navigation and the rescue of vessels in danger. Th...
This article deals with the design and prototyping of a rapidly deployable mobile unit (RDMU), which uses a thermographic camera to autonomously detect, track, and georeference a wildfire that falls within its detection range. The following sections present an analysis of the current situation, followed by the technological developments carried out...
The Automatic Identification System is a Very High Frequency (VHF) radio broadcasting system frequencies (161.975 MHz and 162.025 MHz) that transfers packets of data over the data link (HDLC) and enables AIS-equipment vessels and shore-based stations to send and receive identification information that can be displayed on a computer. It was original...
Control de Operaciones de Dron a través del Sistema AIS. Premio Talento y Compromiso Cajasiete 2015. Artículo recogido en la Revista Zona Teleco Canarias Número 20 de Octubre de 2015. Ésta es una Revista Trimestral del Colegio Oficial de Ingenieros de Telecomunicación de Canarias y la Asociación Canaria de Ingenieros de Telecomunicación. Available...
The GMDSS system is the Global System of Maritime Distress and Safety. It is conformed by a variety of systems that allow communication and a fairly complete coverage on vessel tracking (GMDSS equipment operation assessment standards, CMSA, Mar, 2008). The AIS is part of this system and allows the user to acknowledge: the position, speed, heading a...
A new technique is presented to obtain reduced-order models of microwave oscillators from experimental measurements. The models can then be applied to the analysis and design of single-oscillator or multioscillator configurations such as coupled-oscillator systems. The first-order model is given by the derivatives of the oscillator admittance funct...
The developed prototype has proved to be a useful instrument for the calibration of Doppler/range radars. The system includes innovative solutions for the generation of Doppler and distances with high precision. It is able to generate accurate Doppler shifts with a resolution higher than 4·10-3 Hz and speeds with an accuracy of around ±2.76 ppm - f...
The use of the sea is increasing in areas such as industrial, commercial transportation and sports. It is difficult to quantify the total value of the world maritime industry, and the economic relevance of a sector that affects a wide range of aspects of modern societies and their development. The need to understand the global ecosystems and enviro...
Nowadays, applications for marine autonomous systems are increasing due to the interest caused by different issues: global warming, surveillance, monitoring, etc. These systems need to work twenty four hours without interruption. For this reason, it is indispensable to have an efficient energy system. In order to characterize the consumption and en...
This letter introduces a systematic procedure for the design of direct frequency demodulators based on injection locking. An oscillator is synchronized to the modulated carrier and the modulation signal is extracted from the time-variation of the current or voltage of the bias-network. The synchronized oscillator is optimized with harmonic-balance...
The phase shifters based on the synchronization of an oscillator to the input signal enable low consumption, low cost, and small size. However, the difficulties for an accurate design, associated to the complexity of the operation regime, limit their application to communication systems. Here, a technique is presented for the nonlinear synthesis of...
In this paper, the ACOMAR RED network is introduced. This network is an experimental complex oceanographic data acquisition system according to GOOS program targets (EuroGOOS in Europe). We can outline features such as authorized users running external queries or the system sending messages via email or SMS when measurements are outside a certain r...
En este trabajo se presenta la RED ACOMAR (Red Experimental De Alerta, Control y Observación MARítima de Canarias) y se comentan las novedades más destacadas que incorpora frente a redes de similares características y los problemas que conlleva el desarrollo y mantenimiento de una red de este tipo expuesta a un medio tan hostil como es el mar. Se d...
In this work, the possible application of coexisting stable solutions of oscillator circuits for dual-band frequency division is investigated. This dual-band division is based on the control of the two coexisting solutions through the forcing generator signal. This would avoid the use of additional switching elements. A systematic approach has been...
