Título:
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Analysis and physical interpretation of ionosferic plasma irregularities effect on positioning
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Autores:
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Rodríguez Bilbao, Izarra
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Tipo de documento:
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texto impreso
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Editorial:
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Universidad Complutense de Madrid, 2016-06-27
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = No publicado
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Materia = Ciencias: Física: Astrofísica
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Tipo = Tesis
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Resumen:
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The ionosphere is one of the largest sources of error in the GNSS (Global Navigation Satellite System) positioning not only because the ionospheric refraction can induce errors of several meters in the satellite-receiver signals ranges but also due to the frequent occurrence of plasma density irregularities that lead to signal degradation when crosses them. The effect of the ionospheric irregularities on GNSS signals can be quantified by estimating the TEC (Total Electron Content) from dual frequency GNSS observations. At mid-latitudes it is expected that TEC values vary smoothly in the quiet periods whereas large electron density irregularities occurrence will be related to magnetic storms and other Space Weather phenomena. On the other hand, the physical characteristics of the ionosphere at low magnetic latitudes induce, among other phenomena, the appearance of a peculiar kind of irregularities known as equatorial plasma bubbles (EPBs) which are characterized by TEC depletions. The difference in the physics of the ionosphere at low-latitudes and mid-latitudes marks one of the fundamental guidelines of this Doctoral Thesis and the ROT (Rate of change of TEC) parameter is introduced to evaluate the changes in the electron content over time. In the case of positioning performed using dual-frequency receivers, the error introduced by the ionosphere can, in first approximation, be eliminated by the correction known as "ionospheric-free combination" (iono-free). However, significant errors in the height estimated by Precise Point Positioning (PPP) has been observed in the presence of strong variation in the ROT...
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En línea:
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https://eprints.ucm.es/id/eprint/41977/1/T38592.pdf
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