A statistical analysis on the effect of calculation interval length and data acquisition rate on the determination of scintillation indices
University of New Brunswick
In this thesis, the influence of the calculation interval length of scintillation indices calculated on Global Position System (GPS) signals, recorded at 100 Hz by high-latitude stations, is investigated and compared to results calculated at the commonly used 60 s calculation interval length. Individual cases and the statistics of multiple events, identified over a period of 16 months, are compared. I conclude that calculation intervals as small as 30 s yield results comparable to those obtained with a 60 s calculation interval. The acquisition rate of signals recorded by GNSS receivers is also investigated. High-rate receivers can resolve higher-frequency signal components, which are not predicted to be significant by theoretical scintillation models. An analysis of scintillation indices calculated on artificially decimated signals, emulating a lower receiver sampling rate, is performed. It is found that receiver sampling rates much lower than 100 Hz fully capture the features of scintillation events.