Noise Reduction for Time-Domain Sensing Signal of Brillouin Scattering Based on Time Series Analysis and Kalman Filter Algorithm

Author(s):  
Hongzhen Yang ◽  
Jianpeng Zhao ◽  
Hui Wu ◽  
Chao Fan ◽  
Yuxiang Lv

Holocene climate records are imperfect proxies for processes containing complicated mixtures of periodic and random signals. I summarize time series analysis methods for such data with emphasis on the multiple-data-window technique. This method differs from conventional approaches to time series analysis in that a set of data tapers is applied to the data in the time domain before Fourier transforming. The tapers, or data windows, are discrete prolate spheroidal sequences characterized as being the most nearly band-limited functions possible among functions defined on a finite time domain. The multiple-window method is a small-sample theory and essentially an inverse method applied to the finite Fourier transform. For climate data it has the major advantage of providing a narrowband F -test for the presence and significance of periodic components and of being able to separate them from the non-deterministic part of the process. Confidence intervals for the estimated quantities are found by jackknifing across windows. Applied to 14 C records, this method confirms the presence of the ‘Suess wiggles’ and give an estimated period of 208.2 years. Analysis of the thickness variations of bristlecone pine growth rings shows a general absence of direct periodic components but a variation in the structure of the time series with a 2360-year period.


2015 ◽  
Vol 48 (28) ◽  
pp. 751-756
Author(s):  
J.M. DÍaz ◽  
S. Dormido ◽  
D.E. Rivera

Author(s):  
Yusheng He ◽  
Zhaoxiang Deng

Abstract In the paper, the attention concentrates on the time domain modal analysis. A new method of time series analysis, which is formed mainly by an ideal modeling strategy and a new COR-IV method, is developed. In addition, an interesting parameter called as modal energy ratio, which is available for design reference, is defined and its identification algorithm is given. The new method presented in this paper and Frequency Domain Method (FDM) are performed on a frame of SG120 vehicle. It is shown by comparison between these two methods that the new method of time series analysis is practical.


1968 ◽  
Vol 70 (1) ◽  
pp. 25 ◽  
Author(s):  
O. Brandes ◽  
J. Farley ◽  
M. Hinich ◽  
U. Zackrisson

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