On an adaptive control system for angular motion of a communication satellite

Synthesis of adaptive control system with adjustable model of the communication satellite without using data on angular velocity is considered. Information on deflection angles from the local vertical sensor and tachometers measuring angular velocities of rotation of rotors of three flywheels, and on angular mismatch about the local vertical is used in the control block. The information on the angle of rotation of the satellite about the local vertical is formed on the Earth based on the variation of the polarization plane of the radio signal transmitted from the satellite. The convergence of estimates of the parameters of angular motion to their actual values and the stability of the feedback control with respect to these estimates are studied. This algorithm can be applied as a reserve algorithm in case of failure of angular velocity sensors for prolonging the resource of the communication satellite.