Análisis de ruido con series de tiempo de la Red GNSS de monitoreo continuo del Ecuador (REGME)
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Abstract
The research examines the time series of the Continuous GNSS Monitoring Network of Ecuador (REGME) to identify the type of noise present. Data from the 52 REGME network stations were used, obtained from the Geodetic Reference System for the Americas (SIRGAS) portal. Following an initial analysis of data duration, 16 viable stations for the study were identified, discarding the rest due to insufficient or anomalous data. These selected data were refined to remove outliers and fill in missing values. Subsequently, a linear decomposition analysis was applied to the time series to calculate trends, seasonalities, and particularly, noise, using Fourier transforms. It was concluded that none of the stations exhibited white noise, with pink or flicker noise being common in most, typical of continuous monitoring stations. However, some stations, such as GZEC, and SIEC, exhibited a type of red noise or random walk, with spectral indices close to -2, attributed to monument stability or the type of soil where the stations are embedded.
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