PHASE DIFFERENCES DETERMINATION BETWEEN THE FUNDAMENTAL AND HIGHER HARMONIC COMPONENTS AT NON-COHERENT SAMPLING
David Slepička
Abstract:
The main product of the DFT algorithms is the amplitude frequency spectrum while the phase frequency spectrum calculation is mainly unwanted. However, this part becomes relevant in the cases, in which the spectral lines have to be considered as vectors. Since the data record, from which the frequency spectrum is calculated, is usually acquired by non-coherent sampling, a problem of the correct phase determination appears. Time windows minimise the leakage in the amplitude frequency spectrum; their effect on the phase frequency spectrum is unclear. Moreover, the phase of each frequency depends on its initial phase and it varies in every data record, which is often undesired. One possibility of how to exactly express the phases of higher harmonic components is described in this paper.
XIII IMEKO TC4 International Symposium on Measurements for Research and Industrial Applications (together with IXth International Workshop on ADC Modeling and Testing, IWADC)
