Methods and ways of formal description of incompleteness of information in the initial data on designing of on-board terminal systems

The paper considers two approaches to setting of the aprioristic information and the formal account of uncertainty of the aprioristic data for a class of terminal control systems. Under the first approach the stochastic model of Bayesian type system with partially unknown probability characteristics of stochastic disturbances is set. Under the second approach the family of system models ranged by complexity level is set for the control problems in which the order of the object equations and the class of stochastic disturbances are unknown.