Universitat Politècnica de Catalunya
Now showing items 21-40 of 321
This thesis is the initial stage in the development of a range-resolving Doppler wind lidar. Atmospheric lidars emit pulsed laser radiation that after being scattered by air molecules and suspended aerosol particles is ...
En esta tesis se han desarrollado los siguientes métodos numéricos para el análisis de estructuras planares, especialmente finline, en la banda de microondas y ondas milimétricas: <br/>-el método de las líneas con ...
En esta tesis se ha abordado el problema de la determinación directa del régimen permanente de circuitos no lineales autónomos con parámetros distribuidos en el dominio temporal. Con la obtención de las ecuaciones de ...
En esta tesis, las ecuaciones de equilibrio de circuitos no lineales autónomos se plantean discretizando el circuito mediante transformaciones de plano S a plano Z.<br/><br/>Tras imponer la periodicidad de las variables ...
Esta tesis aborda la sincronización de una o varias réplicas de una señal conocida recibidas en un entorno con propagación multicamino e interferencias direccionales. Uno de los hilos conductores de este trabajo es la ...
There exists today an increasing demand for wireless devices which require low cost and minimum power consumption radiofrequency front-ends. Precisely, these are two remarkable characteristics of the superregenerative ...
En esta tesis se estudia el problema de modelado geométrico de objetos arbitrarios para aplicaciones de análisis electromagnético. El objetivo principal ha sido el desarrollo de un proceso completo, lo mas general posible, ...
La tesis contiene en primer lugar un estudio de las técnicas de interferometria radiometrica, con énfasis en las causas de error y su impacto en las características del sensor. A continuación se proponen y comparan varias ...
Esta tesis trata de la aplicación del control adaptativo con modelo de referencia en paralelo para la linealización de un amplificador de potencia y del uso de la propiedad de la pasividad (hiperestabilidad) en el diseño ...
The aim of the present thesis has been to test the applicability of the innovative Advanced DInSAR techniques in the natural risk mitigation related to subsidence phenomena. In particular, two test sites have been chosen, ...
Satellite broadcasting and relaying capabilities enable mobile broadcast systems over wide geographical areas, which opens large market possibilities for handheld, vehicular and fixed user terminals. The geostationary (GEO) ...
Human activity leads to environmental changes which threaten the vegetation. Global warm ing trends, deforestation and land cover, or modified Earth's surface albedo, are sorne examples of these environmental changes. ...
Human motion analysis is as a broad area of computer vision that has strongly attracted the interest of researchers in the last decades. Motion analysis covers topics such as human motion tracking and estimation, action ...
lnSAR has been proved its unprecedented ability and merits of monitoring ground deformation on large scale with centimeter to millimeter scale accuracy. However, several factors affect the reliability and accuracy of its ...
In the last years free-space optical communications systems for wireless links have been proposed, studied, and implemented mainly due to the higher bandwidth that this technology is able to provide. Still, radio frequency ...
Los sistemas de posicionamiento global GNSS (GPS y GLONASS) se han convertido en una herramienta básica para obtener medidas geodésicas de la Tierra y en una fuente de datos para el estudio atmosférico. Proporcionan cobertura ...
The Atmospheric Boundary Layer Height (ABLH) is an important parameter in weather forecasting, meteorology, avionics, and air-quality and dispersion models. Local development of the Atmospheric Boundary Layer (ABL) over ...
Most preterm newborns must be admitted to a Neonatal Intensive Care Unit (NICU) where they receive a specialized medical care, what, in many cases, is crucial for their survival. The acoustic environment of a typical NICU ...
Aquesta tesi gira al voltant del disseny de receptors per a sistemes globals de navegació per satèl·lit (Global Navigation Satellite Systems, GNSS). El terme GNSS fa referència a tots aquells sistemes de navegació basats ...
In order to provide wireless services for the current demand of high data rate mobile applications, more spectrally efficient systems are needed. As a matter of fact, the current wireless systems are limited by a frequency ...
