Aerospace Instrument-Making Annotation << Back Models of non-stationary systems with the uniformly time-varying рarameters С.В. Богословский The urgency of a problem is caused by necessity to start with studying of properties of the Cauchy task exact decision because of the correct analysis and the synthesis of non-stationary control systems. However absence of the exact analytical decision of considered non-stationary systems of the differential equations compels to use the approached models. The models received with use of various algorithms of approached summation of the asymptotical decompositions of the exact decision of Cauchy task are considered. For the first time the approached models taking into account values of the exact decision in initial and final points of a trajectory are constructed.