Search for Periodicity in the Unequally-Spaced Data Sequence

Based on the power spectrum method for unequally spaced data, developed by Deeming, we generalized B-T method by adding data outside data window up to arbitrary times the original data length and recognizing spectral peak and determine periods by means of envelope of spectral line. At the same time, the harming window is used for smoothing the spectrum and two statistical method are applied to juge and choose the spectral peaks. The phase analysis is adopted to judge finally whether or not the spectral peak is real and determine precisely the period value. The result both from simulations and practical applications in astronomy show: based on Deeming method, it is effective and preferable to introduce a few of auxiliary ways into the power spectral analysis in improving the identification of spectral peak and the pricisc determination of period.