Browsing by Author "Buchma, Ihor"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Errors in the measurement of small phase shifts with binary sampling
    (Видавництво Львівської політехніки, 2018-09-18) Buchma, Ihor; Lviv Polytechnic National University
    In this report the errors of the measurement phase shift between the harmonic signals using binary sampling are analyzed. The main source of errors in such measurementі is the inequality of signal amplitudes. We determined four methods of measuring the phase shift whose we are considering here. The mathematical models of additive errors for various methods were determined and a their comparative analysis is carried out. The graphs of dependences of errors on amplitudes inequality are constructed. The method that provides the least error is determined.
  • Thumbnail Image
    Item
    Errors of phase shift measuring by algorithmic sum-difference methods from amplitudes inequality and their reduction methods
    (Publishing House of Lviv Polytechnic National University, 2016) Buchma, Ihor
    This paper analyzes the errors entailed by the signal amplitude inequality when measuring the phase shift among low frequency harmonic signals for algorithmic sum-difference methods. It is shown that additional phase shifts of summary and difference signals caused by the inequality of compared signals in some methods affect the errors, whereas in others they do not. A method in which there is no additive component of the error has been found. This method has been admitted to be the best to measure small phase shifts. The method for measuring the phase shift, which enables to avoid errors due to amplitude inequality of compared signals has been proposed.