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Space radio system (also: space system) is – according to article 1.110 of the International Telecommunication Union´s (ITU) ITU Radio Regulations (RR) – defined as «Any group of cooperating earth stations and/or space stations employing space radiocommunication for specific purposes.»
Each system shall be classified by the service in which it operates permanently or temporarily.
References
Space radio system Wikipedia(Text) CC BY-SA