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Mitigating satellite motion in GPS monitoring of traveling ionospheric disturbances
Author(s) -
Penney R. W.,
JacksonBooth N. K.
Publication year - 2015
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/2015rs005767
Subject(s) - global positioning system , spurious relationship , satellite , ionosphere , waveform , geodesy , doppler effect , remote sensing , computer science , geology , physics , telecommunications , geophysics , radar , astronomy , machine learning
We discuss the impact of satellite motion on the use of compact arrays of GPS receivers for estimating the velocity of traveling ionospheric disturbances (TIDs). It is shown that satellite motion has subtle effects upon standard techniques of waveform cross correlation, or time difference of arrival, which can easily lead to spurious TID velocity estimates. We present some improved techniques for cross‐correlating TID waveforms while taking account of the Doppler shifts created by satellite motion. In addition, we discuss some improved techniques for separating TID waveforms from background ionospheric trends, such as diurnal variation, based on high‐order polynomial fitting with well‐defined frequency selectivity. The application of these techniques to a sensor array in the UK is discussed.