The basis for a satellite's Command and Data Handling Subsystem (CDHS) design are the nominal mission operations. However, in case of a failure, a satellite should still be able to perform as many operations as possible, by circumventing or dealing with such a failure. An important factor for the reliability of a satellite is the relation between the CDHS and the Electrical Power Subsystem (EPS). If the continuity of CDHS operation is less dependent on the continuity of the power, the reliability of the overall system will increase. The CDHS design of Delfi-C~3 will serve as a case study to find ways of decreasing this dependency. This paper discusses the impacts of the absence of onboard energy storage for the CDHS design and the differences in the design philosophy compared to satellites which do have an EPS with onboard energy storage. The paper shows that this new approach can be useful for all satellites, independent of the availability of energy storage.
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