IQ quadrature demodulation algorithm used in heterodyne detection |
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| Institution: | 1. National Research Council, Institute for Microelectronics and Microsystems, (CNR-IMM), Via del Fosso del Cavaliere 100, 00133 Rome, Italy;2. Keysight Technologies Austria GmbH, Gruberstrasse 40, 4020 Linz, Austria;3. Johannes Kepler University, Biophysics Institute, Gruberstrasse 40, 4020 Linz, Austria;1. Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht Str. 24/25, Potsdam 14476, Germany;2. Department of Control Theory, Institute of Information Technologies, Mathematics and Mechanics, Lobachevsky University Nizhny Novgorod, Russia |
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| Abstract: | In order to obtain better detection results of heterodyne, we used phase IQ quadrature demodulation algorithm to process the data which detected by laser heterodyne. Based on laser heterodyne interferometer, processing the data in the interferometer phase IQ quadrature demodulation algorithm from the signal to noise ratio, sampling rate, sampling rate, filter order and cutoff frequency, verify the effects of these system parameters to the phase precision, and choose the best parameters to obtain a better phase precision through experiment as: the signal to noise ratio is 25 dB, the IF signal frequency is 98.3 MHz, 98.5 MHz, 99.1 MHz, 99.5 MHz and 100 MHz, the sampling rate is 512–2048, the cutoff frequency and order of the filter are 0.11 and 40, respectively. |
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| Keywords: | IQ quadrature Heterodyne Phase precision |
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