A fractionated satellite consists of a number of distinct free flying modules with specific functions (such as a high speed downlink or a payload), but connected wirelessly. By connecting the modules in this way they function as a single entity and can deliver the same capability as a single satellite with all the same functions on-board. This research explores? the best way to design a fractionated system such that a continuity of measurements can be maintained over a period greater than a "traditional" mission lifetime (10-12 years) whilst minimising the mass launched over the operational lifetime.