Open AccessThe paper studies characteristics of the basic errors of a small-sized laser gyro ЛГК-180 with a resonator perimeter of 18 cm at the average intervals of the measurement time (up to 14 hours) in laboratory conditions by the method of Allan variations and other digital processing methods of the laser gyro (LG) output signal. The claimed accuracy parameters of LGA-180 for a zero drift are experimentally verified on the stationary bench when measuring a vertical component of the angular velocity of the Earth's rotation. The zero drift and its turn-on reproducibility, a random walk are analysed. To reduce the noise effect on the device accuracy characteristics are used digital methods for suppressing intrinsic noise "Conditional sampling of straight regression lines" and "Image recognition of an ideal LG output signal". It is shown that for such parameters as zero drift in turn-on, the LG random walk and turn-on zero drift satisfy modern requirements.