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8
Issue
vol 63 / August, 2020
Article

DOI 10.17586/0021-3454-2020-63-6-495-500

UDC 621.396:681.323

EFFECT OF ERRORS IN ADJUSTMENT OF QUADRATURE CHANNELS OF A COHERENT SYSTEM ON COMPLEX SIGNAL PARAMETERS ESTIMATION

S. I. Ziatdinov
St. Petersburg State University of Aerospace Instrumentation, Department of Information Network Technologies; Professor


Мичурин С. В.
Санкт-Петербургский государственный университет аэрокосмического приборостроения, Кафедра информационно-сетевых технологий ;


Abstract. Features of measuring complex signal amplitude and frequency in video frequency range by a system consisting of two quadrature channels are considered. Formulas for fluctuating amplitude and frequency of complex narrow-band random signal are derived with the account for errors in setting the signal processing system. The influence of practically unavoidable amplitude and phase misalignments of quadrature channels is studied. Expressions for errors in measuring parameters of a complex signal in cases of inequality in the transmission coefficients of quadrant channels and deviations of reference voltages from ninety degrees when converting input radio signals to video frequency are presented. Requirements to the quality of tuning of quadrature channels accounting for errors in measuring complex signal amplitude and frequency are determined. It is assumed that the presented results can be used in development and research of coherent signal processing systems.
Keywords: setting errors, complex signal, parameter measurement, amplitude, frequency

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