Application of Trend Extrapolation Method to Spectrum Analysis of Microtremor Signal

摘要

The trend extrapolation method is applied to spectrum analysis of microtremor signal in order to increase the spectral estimation accuracy. First, establish an appropriate extrapolation model based on the existing data series, and then fit correlation functions other than existing data by derivative least squares method, finally perform spectrum analysis using extrapolated correlation functions. Numerical simulations and the experimental results show that good results are achieved no matter correlation functions change slow or rapid, and the extrapolation error is not more than 2.3%.