How to calculate filter window width
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Hi,
My task is to detrend raw phase and amplitude recorded by the GPS receiver. In the creation of detrending filters, I used article:
Van Dierendonck, A. J., John Klobuchar, and Quyen Hua. "Ionospheric scintillation monitoring using commercial single frequency C/A code receivers." proceedings of ION GPS. Vol. 93. 1993.
I would like to use whole signal recorded during one hour of measurement, instead of discarding first and last 3-4 minutes of the signal due to the edge effects. Possible solution is data expansion by regression or symetric reflection by "half the filter window width".
Problems:
- How to calculate "half the filter window width"? I am using three 2nd order Butterworth filters (hugh pass for phase, low pass for amplitude), as stated in the article mentioned above.
- Why is edge effect more pronounced for phase than for the amplitude of signal?
Can anyone suggest any literature on data expansion?
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