Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003acasn..44..324y&link_type=abstract
Acta Astronomica Sinica, vol. 44, no. 3, p. 324-329
Astronomy and Astrophysics
Astronomy
1
Astrometry, Monte Carlo Method, Filtering, Length Of Day
Scientific paper
The degree of Freedom (DOF) of digital filtered time series will be decreased rapidly. To determine the DOF of a filtered data series by different kinds of filters, Monte Carlo method can be applied and the critical correlation coefficients at different confidential levels can be simulated correctly. Assuming that the ratio between filtered frequency band and Nyquist frequency band is Z the DOF of the filtered data series is Z and Z/2 times as that of its origin data series respectively, for a one-way and a two-way perfect filter. But for a non-perfect filter, this rule is not suitable.
Yan Hao-Ming
Zhong Ming
Zhu Yao-Zhong
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