Narrow-band fitering of polar series using a multi-stage filter

Details Narrow-band fitering of polar series using a multi-stage filter Narrow-band fitering of polar series using a multi-stage filter

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987cha%26a..11..155z&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 11, Issue 2, p. 155-161.

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

In accordance with the theory of numerical filter, we used a serial combination of Vondrak filter to construct a multi-stage filter of the form tW = C[I -VN]M to effect a narrow-band filtering of time series. Simulation tests returned favourable results. Applying this filter to the homogenized ILS series (1899.85 - 1978.95) of Yumi and Yokoyama, we successfully isolated the annual term, the Chandler term and the long-period term in the x- and y- series, and obtained practical 0.05 yr series of the various terms.

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