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TELECOMMAND AND TELEMETRY COMPONENTS FOR TODAY AND TOMORROW

The CCSDS Telecommand (TC) and Telemetry (TM) standards are today being employed for a large number of scientific and commercial spacecraft. Using this standard allows reduced costs for on-board, ground and test equipment, as well as for spacecraft testing and in-orbit operation. This paper introduces the CCSDS/ESA standards, and presents the supporting standard components developed by ESA and a typical TM/TC system based on these components. Some examples of spacecraft using these components are then given. To round off the paper a new concept for essential telemetry retrieval is introduced. Some issues for future developments of TM/TC components are listed, intended as a first input for discussions on the development approach and priorities. The objective would be to allow significant reduction in spacecraft cost by higher level of integration and by allowing the same equipment to be used for commercial and scientific