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The problem of the ecological system long-term keeping near the equilibrium position with minimization of control resources is considered. A mathematical formulation of this problem and a method for optimal expenditure control constructing are presented. While deviations from the equilibrium point are very small, its controlled dynamics can be described by linear differential equations with constant coefficients. The control actions are modeled by piecewise-constant unidirectional functions with a finite number of...

The possibilities and prospects of a solar sail using to solve new problems of space systems control are discussed. The economic and environmental benefits that can be obtained with this control method for interplanetary transitions or for the functioning of the space system in the near-planetary space are considered. This type of control is carried out through the use of special solar sail designs that allow the maximum use of light pressure. The very idea of the solar sail control is connected with the search fo...