Errors of in-phase and quadrature demodulation method created by low-pass filter
https://doi.org/10.17586/2220-8054-2024-15-3-325-331
Abstract
This article explores phase errors created by low-pass filter in interferometric signals which are processed by In-Phase and quadrature demodulation algorithm (IQ-demodulation). These errors were calculated using the analytical method and were compared with mathematical modeling, which uses pre-calculated parameters: phase, sampling period, infinitesimal parameters. In this paper, we show that phase errors calculated with analytical method clearly correlate with mathematical modeling errors. This work made it possible to calculate corrections to the demodulated phase, which, in turn, made it possible to refine the phase calculation step in IQ demodulation algorithm using the arctangent function. The resulting formulas describing the correction to the demodulated phase will increase the accuracy of the quadrature method, which is used to process signals from interferometric devices of various types, such as: reflectometers, geophysical seismic systems,
interferometric radiometry, etc.
Supporting agencies: The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (project No. FSER-2024-0006)
About the Authors
G. P. Miroshnichenko
http://nanojournal.ifmo.ru
ITMO University
Russian Federation
ITMO University
Russian Federation
George P. Miroshnichenko
Research Center of light guide photonics
197101; Kronverksky pr. 49; St. Petersburg
A. N. Arzhanenkova
http://nanojournal.ifmo.ru
ITMO University
Russian Federation
ITMO University
Russian Federation
Alina N. Arzhanenkova
Research Center of light guide photonics
197101; Kronverksky pr. 49; St. Petersburg
M. Yu. Plotnikov
http://nanojournal.ifmo.ru
ITMO University
Russian Federation
ITMO University
Russian Federation
Michail Yu. Plotnikov
Research Center of light guide photonics
197101; Kronverksky pr. 49; St. Petersburg
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Review
For citations:
Miroshnichenko G.P., Arzhanenkova A.N., Plotnikov M.Yu. Errors of in-phase and quadrature demodulation method created by low-pass filter. Nanosystems: Physics, Chemistry, Mathematics. 2024;15(3):325-331. https://doi.org/10.17586/2220-8054-2024-15-3-325-331
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