Abstract
The article examines the problem of developing methods for evaluation of the effectiveness of space systems in flight. The criteria of spacecraft control efficiency are introduced, justified and calculated on examples. The accessibility and operational efficiency of on-board instrumentation, labour costs associated with the preparation and execution of communication and control sessions as well as reliability of communication systems are set as the main criteria of efficiency. As an example, the criteria of efficiency of space systems controlled with and without relay satellites are calculated. A comparative analysis of various approaches to the realization of space system in-flight control is performed. The developed methods can be used as a tool to evaluate the efficiency of space system in-flight control.
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