Detecting harmonic signals in a noisy time-series: the z-domain Autoregressive (AR-z) spectrum
Geophysical Journal International(2015)
摘要
We develop a new method referred to as the AR-z spectrum for detecting harmonic signals with exponential decay/growth contained in a noisy time-series by extending the autoregressive (AR) method of Chao & Gilbert. The method consists of (i) ‘blindly’ forcing one 2nd-order AR fit to the signal content in the frequency domain for any chosen frequency whether or not there is truly a signal; (ii) find...
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关键词
Time-series analysis,Surface waves and free oscillations
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