Uppsatser om spectral analysis

3 uppsatser

Högfrekventa tryckvariationer under de senaste århundradena

Magisteruppsats · Lunds universitet

… traceable in the time series from Lund. The period 1859-1997 was analysed by spectral analysis. The measurements are unevenly sampled so prior to applying various techniques of spectral analysis it was necessary to interpolate the time series to a regular grid. The series showed …

MPD-vågformer för helikopterradar

Examensarbete, grundnivå · Linköpings universitet

… Repetition Frequency (PRF). The velocity of the moving targets is measured by spectral analysis of the pulses received. With this sort of system some targets will not be possible to detect. These targets are said to be blind for the radar. Also the measured targets can be …

Automatisk detektering av akustiska resonansfrekvenser i trästockar

Examensarbete, grundnivå · Uppsala universitet

In order to measure the quality of the logs, one can with help of Fast Fourier Transform technique get the signals resonance peaks. With help of these peaks you can see whether the quality of a tree is good or bad. This report contains the work of a where a program has been …

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