FFT
From BAWiki
Basic Information
Name of Program
FFT
Version-Date
2.x
Description-Date
August 2003
Catchwords
analysis of equidistant time series
spectral analysis
filter
fourier transformation
linear trend
Short Description of Functionality
The program FFT processes the time series results of different Mathematical Models for Coastal Areas and Estuaries as well as measured time series. FFT can filter the data, make a spectral analysis and compute a linear trend. It enables the user to modify the analysed data.
Input-Files
- general input data (file of type fftein.dat)
- measured or numerically computed time series (file of type boewrt.dat or knoerg.bin)
Bold text
Output-Files
- lineprinter file with information about spectrum and time series (file of type fftsdr.dat)
- filtered time series (file of type solwrt.dat)
- batch file for the program ZEITRIO to convert the filtered time series into a file of type boewrt.dat
- linear trend of a time series (file of type solwrt.dat)
- original time series with the subtracted linear trend (file of type solwrt.dat)
Methodology
The program FFT may be used to analyse and modify time series with equidistant time steps. These are the features in detail:
- computation of a discrete spectrum by means of a fourier transformation
- computation of a power spectrum
- computation of correlating spectra and and of a function to correlate two time series
- diverse filter types
- computation of inverse fourier transformation; generation of an equidistant time series out of the (filtered) discrete spectrum
- computation of a linear trend
- subtraction of the linear trend from the original time series
- subtraction of the difference of the linear trends of two time series from the input data of the first originsl time series
Program(s) to run before this Program
Program(s) to run after this Program
BOERND, EVENTFILTER, EXCELENZ, FRQWF, GVIEW2D, TIDKEN, TSCALC, UTRRND, ZEITRIO
Additional Information
Language
FORTRAN90
Additional software
-
Original Version
I. Uliczka
Maintenance
Documentation/Literature
please refer to $PROGHOME/examples/fft/
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