A probabilistic model checking approach to analysing reliability, availability, and maintainability of a single satellite system

Satellites now form a core component for space based systems such as GPS and GLONAS which provide location and timing information for a variety of uses. Such satellites are designed to operate in-orbit and have lifetimes of 10 years or more. Reliability, availability and maintainability (RAM) analysis of these systems has been indispensable in the design phase of satellites in order to achieve minimum failures or to increase mean time between failures (MTBF) and thus to plan maintainability strategies, optimise reliability and maximise availability. In this paper, we present formal modelling of a single satellite and logical specification of its reliability, availability and maintainability properties. The probabilistic model checker PRISM has been used to perform automated quantitative analyses of these properties

Model of Tasks with Constrains and Mechanisms of Their Scheduling in UPPAAL SMC

Cieľom je vytvorenie prehľadu mechanizmov plánovania úloh v jednoprocesorovom prostredí. Použitím týchto mechanizmov sú navrhnuté a implementované jednotlivé modely v nástroji UPPAAL, na ktorý sa táto práca orientuje. Výsledkom práce je overenie validity a vlastností mechanizmov získaných na základe implementovania modelov. Na porovnávanie výsledkov z nástroja UPPAAL sú využíté nástroje TimesTool a Cheddar.The effort of this thesis is the review of mechanisms of tasks planning in singlecore environment. Each models are designed and implemented in tool UPPAAL using these mechanisms. The main focus in this thesis is the tool UPPAAL. Result of this thesis is verification of each mechanisms properties received from implementation of models in UPPAAL. TimesTool and Cheddar are the tools which are used for comparing our results from UPPAAL.