Ussually, we use running average to detrend total electron content (TEC) data from GPS(GNSS) and to filter required period range. Could someone recomend a paper devoted to comparison of different filters for this purpose.
Dear Yury,
Check out this paper...
"Identification of vertical total electron content by time series analysis, Digital Signal Processing 19(4):740-749, 2009 by Erdogan H and Arslan N."
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