Certificate of Registration Media number Эл #ФС77-53688 of 17 April 2013. ISSN 2308-6033. DOI 10.18698/2308-6033
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On the selection of the digital filter at the laser gyrometer output in the mode of measuring small constant angular velocity

Published: 27.01.2015

Authors: Saneev I.V.

Published in issue: #1(37)/2015

DOI: 10.18698/2308-6033-2015-1-1358

Category: Information technology | Chapter: Management and Navigation

The paper describes investigations of a possibility to increase the accuracy of laser gyrometer operating in the mode of measuring small constant angular velocity. The accuracy is increased by noise suppression at the output using various digital filters in the case when the noise amplitude is by several orders higher than measured signal. Noise at the output of laser gyro can be caused by the internal factors: e.g. dither noise, discrete output of pulse-phase detector (PPD), etc., and external reasons, such as vibrating disturbance. Modeling such digital filters as Butterworth-IIR-Filter, Chebyshev II order IIR filter, Blackman-Nuttall-FIR-Filter and the filter based on robust selections of straight regression lines under conditions of vibrations has been performed. As a result of research it has been established, that at reasonable microprocessor resource intensity the filter based on robust selections of straight regression lines most effectively suppresses output noise which allows to measure low constant angular velocity with an acceptable accuracy for a variety of applications with intense vibrations of a base caused, e.g., by engine operation.

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