Estudio y diseño de un sistema de comunicación con submarinos sumergidos
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Inclou dades d'ús des de 2022
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hdl:2117/327052
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Tipus de documentTreball Final de Grau
Data2020-06-01
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Abstract
Radio frequency communication with submerged submarines has been a great challenge due to the difficulty of propagating electromagnetic waves under the sea surface, as this medium acts as a lossy conductor. This behavior occurs throughout the radio spectrum and is more pronounced as the frequency increases. Above the LF band, electromagnetic waves are attenuated so sharply that their penetration into the sea cannot be be considered. At very low frequencies, the depth of penetration into seawater increases considerably, allowing communications using electromagnetic waves provided that the reception of the signal is done close enough to the surface. This project will carry out an exhaustive analysis of the aspects that condition radio frequency communications with a submerged submarine. The adoption of the VLF band as preferred for the establishment of these communications has been justified based on its better radiation efficiency, compared to lower frequency systems, and sufficient word rate per minute. By using the numerical analysis software 4NEC2, the fundamental transmission parameters of various monopole antennas in the VLF band have been obtained and their improvement has been quantified by updating different loading or counterpoise strategies. Also, a loaded monopole with counterpoise transmitter system has been designed, so that it has obtained at theoretical level radiation parameters analogous to real radiation systems, such as Cutler's Trideco antenna (in Maine), installed by the US Navy for radio communication with submarines in the Atlantic Ocean. In addition, it has been estimated the capacity of penetration of electromagnetic waves into the sea through the VOACAP software, and it has been reasoned how the most common morphologies of reception antennas transported by submarines allow capturing the tiny component of tangential electric field to the underwater surface that penetrates into the sea. Finally, other alternatives have been presented for communication with submerged submarines: (1) optical communication (in the blue-green band), too dependent on the propagation meteorological conditions, and (2) quantum communication, still in the experimental stage.
TitulacióGRAU EN ENGINYERIA DE SISTEMES DE TELECOMUNICACIÓ (Pla 2009)
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memoria.pdf | 5,963Mb | Visualitza/Obre |