Ultra-precision attitude control of a large low-orbital space telescope

Methods for attitude guidance and precise robust gyromoment control of large-scale agile observation spacecraft

“…Here for given time interval T p a problem consists in determination the explicit time functions Λ(t), ω(t), ε(t) andε(t) for the boundary conditions (5), (6) and also for given conditioṅ…”

“…Increased requirements to such information satellites (lifetime up to 10 years, exactness of spatial rotation maneuvers with effective damping the SC flexible structure oscillations, robustness, fault-tolerance as well as to reasonable mass, size and energy characteristics) have motivated intensive development the gyro moment clusters (GMCs) based on excessive number of gyrodines (GDs) -single-gimbal control moment gyros. Mathematical aspects of the SC nonlinear gyromoment control were represented in a number of research works [1,2] et al including the authors' papers [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The paper suggests new results on attitude guidance and nonlinear robust gyromoment attitude control of the agile observation spacecraft.…”

Precise nonius guidance and image stabilization of a large space telescope

“…Authors have an experience on research and dynamic synthesis of the space nonlinear control systems, see for example [9], [10], [11] and [12], [13], [14]. As the main methods for synthesis of nonlinear control systems we use methods of Lyapunov functions and vector Lyapunov functions (VFL) in association with the exact feedback linearization (EFL) technique and back-stepping based approach.…”

Nonlinear Dynamic Research of the Spacecraft Robust Fault Tolerant Control Systems

“…Proof see for example in Somov et al (1999a): the basis of inequality for vector norm ρ (x(t)) is attained by the comparison principle, using the maximum right-sided solution x c (t) ≡ x c (t 0 , x c0 ; t) of a comparison system.…”