System Modelling for Spacecraft On-Board Computers

This study makes an evaluation of the usability of SysML, a system graphical\nmodeling language, for capturing functional requirements for space electronic\nproducts. This is done by a case study in which a model of a Packet Telemetry\nEncoder system is developed. The report includes a brief overview of various\ngraphical modeling languages. The case study illustrates how the SysML provides\nsystem engineers with a robust modeling language. SysML is an extension to UML\n(unified modeling language) which is widely used by software engineers. The\nextension to the UML profile includes requirements modeling, parametric\nmodeling, allocation and extension to structural and activity modeling. These\nextensions of the UML language are known as the SysML Profile. SysML is a\nrepresentation of domain-specific engineering analysis models and the great\nadvantage of applying the language is providing a single model to capture\nrequirements, system elements and the relationship between these model elements.\nThis capability of SysML is satisfying the traceability of requirements which is\nrequired in every stage during the system development life cycle. SysML is a\nmethodology and tool independent language.