Noise characteristics of high-frequency,short-duration GPS records from analysis of identical,collocated instruments |
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Authors: | Fanis Moschas Stathis Stiros |
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Affiliation: | Dept. of Civil Engineering, Patras University, Patras 26500, Greece |
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Abstract: | High-rate (>1 Hz) GPS, currently used for measurement of dynamic processes and as a universal time and frequency standard, is usually assumed to be affected by site-specific errors and only limited studies of the error properties of high-frequency (10 Hz), short-duration (<100 s) GPS records exist. Preliminary studies, provided evidence of instrument-specific errors, which were investigated on the basis of systematic experiments with various types of stationary, collocated, identical GPS units. This analysis revealed differences between couples of receiver/antenna units, while spectral analyses revealed low-frequency colored noise, statistically significant below 0.2 Hz and, gradually decaying with increasing duration of observations, so that above 2.5 Hz measurements are contaminated only by white noise. |
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Keywords: | GPS Collocated instruments Signal decomposition Time series analysis Dynamic measurements Power spectrum Colored noise White noise |
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