Research on Fast Overlocking Technology of Mechanical Dithered Ring Laser Gyroscope
The lock-in effect largely determines the performance of mechanically dithered ring laser gyroscope.In or-der to reduce the over-locking time and improve the accuracy of gyroscopes,a frequency-multiplication dithering method with odd harmonic superposition is proposed.Firstly,the design criteria for the odd frequency-multiplication dither signal are presented,and the over-lock-in region characteristics of single and combined odd frequency-multiplication signals are analyzed.Secondly,the effects of the dither mechanism on the amplitude and phase of odd frequency-multiplication signals of various orders are analyzed,and a laser vibrometer is used to test the dither amplitude of the cavity under different orders of odd frequency-multiplication dithering.The results show that the optimal order of the odd frequency-multiplication signal can be selected based on the measured response amplitude in practical engineering applications.Finally,M-sequence noise is used to increase the random characteristics of the dither signal and simulations are performed.The simulation results in-dicate that compared with the commonly used sinusoidal dither signal,the accuracy of gyroscopes can be effectively im-proved by employing the odd frequency-multiplication dither signal proposed.
mechanical dithered ring laser gyroscopeodd frequency-multiplicationlock-in zoneaccuracy
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