Remote Control and Navigation

Sensitivity of digital processing method for laser gyroscope primary signals to input perturbations

M. V. Chirkin^a, J. Ivanenko^a, A. Serebryakov^a, V. Mishin^a, A. V. Molchanov<sup>b

a</sup> Ryazan State Radio Engineering University, Ryazan
^b Moscow Institute of Electromechanics and Automatics, Moscow

Abstract: The mathematical model for laser gyroscope primary signals that includes coupling between counter-propagating optical waves, mechanical rotation of laser gyroscope body and additive noise is formed. The sensitivity of the method to calculate the instantaneous Sagnac phase with compensation for dynamic lock-in to input perturbations is studied on the basis of laser gyroscope having the harmonic dither unnoised. To analyze the method to calculate the instantaneous Sagnac phase with compensation for dynamic lock-in, the results obtained are compared with the angular rate being the analytical solution of differential equation for laser gyroscope with zero lock-in zone. Phase errors between a test signal and a reference signal of angular rotation rate of laser gyroscope are recorded. The effect of quasi-white noise, changes in primary signal amplitudes and phase shift between quadrature signals and the signal being the alternating component of power signal sum is determined on the registered counts of angular rotation rate of laser gyroscope body.

Keywords: laser gyroscope, Sagnac phase, dynamic lock-in threshold, static lock-in threshold, quasi-white noise.

UDC: 629.7
BBK: 39.56

Received: January 29, 2024
Published: May 31, 2024

DOI: 10.25728/ubs.2024.109.11