Abstract. The high cost and the compression of the development timescale of a realistic satellite simulator motivated the definition of a set of functional requirements based on standardized space services, which is presented in this paper. In order to improve as much as possible reusability and consequently decreasing cost in development, the use of standards were intensively adopted specially for the satellite independent functions, namely, data handling and communication among ground and on-board systems. Functions related to the on-board data handling computer and its communication with the ground systems were based on the ECSS-E-70-41A standard, which focuses on telemetry and telecommand packet utilization definition. The protocol supporting the ground and on-board system communication, at several layers, were based on the Consultative Committee for Space Data Systems (CCSDS) recommendations. This paper presents a set of generic satellite simulator functional requirements modeled into the UML and SysML use case artifact. The satellite and ground station functions included are as much general as possible, as they were based on practical publications of related works and in space service standards.
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