Abstract-The problem of determining the roll angle of a fast rotating object has been analyzed in the paper. Possibility of creating a fast rotating single-axis orientation system that was able to determine the roll angle for a long time with minimal errors, based on data from various sources, has been considered. Algorithms designed to determine the roll angle of a fast rotating object using information from a micromechanical gyroscope, vector magnetometer and optical sensor have been considered in detail. Kalman filter which estimates the model of angular velocity sensor errors and the orientation error was used