12 / 13
И.В. Санеев
12
On the selection of the digital filter
at the laser gyrometer output in the mode of measuring
small constant angular velocity
© I.V. Saneev
Bauman Moscow State Technical University, Moscow, 105005, Russia
The paper describes investigations of a possibility to increase the accuracy of laser gy-
rometer operating in the mode of measuring small constant angular velocity. The accu-
racy 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 dis-
turbance. 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 re-
search 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.
Keywords:
laser gyroscope, laser gyrometer, digital signal processing, digital filters,
filter based on robust estimation.
REFERENCES
[1] Chen A., Li J., Chu Z. Dither signal removal of ring laser gyro POS based on
combined digital filter. Instrumentation and Control Technology (ISICT), 2012.
8th IEEE International Symposium on IEEE
, China, 2012, pp. 178–182.
[2] Zhang Q.H., Hu Sh.M., Lu G.F. Research on new signal processing method of
mechanically dithered ring laser gyro.
Optical Tehnique
, 2010, vol. 36(1),
pp. 126–129. [in Chinese].
[3] Molchanov A.V.
Issledovanie konstruktivno-tekhnologicheskikh kharakteristik
lazernogo giroskopa s tselyu povysheniya ego kachestva
[Investigation of struc-
tural and technological characteristics of the laser gyroscope for the purpose of
improving the quality]. Ph.D. Thesis, Moscow, 2005, p. 17.
[4] Saneev I.V.
Molodezhnyy nauchno-tekhnicheskiy vestnik –Youth Science and
Technology Gazette
, 2012, no. 10.
[5] Nuttall A.H.
IEEE
Transactions on Acoustics, Speech, and Signal Processing
,
1981, vol. 29(1), pp. 84–91.
[6] Kester U.
Proektirovanie sistem tsyfrovoy i smeshannoy obrabotki signalov
[Design of digital and mixed signal processing systems]. Moscow, Tekhnosfera
Publ., 2010, pp. 124–157.
[7] Bychkov S.I., Lukyanov D.P., Bakalyar A.I.
Lazernyy giroskop
[Laser gyro-
scope]. Moscow, Sovetskoe radio Publ., 1975, pp. 109, 110.
[8] Lee J., Whaley P.W
. Journal of Sound and Vibration
,
1976, vol. 49(4), pp. 541–
549.
[9] Saneev I.V. Simmetrichnaya neyavnaya skhema resheniya uravneniya lazernogo
giroskopa [Symmetric implicit scheme for solving the equation of the laser gy-