ISBN 9783843911344

978-3-8439-1134-4, Reihe Ingenieurwissenschaften

Johannes Feuser
Open Source Software for Train Control Applications and its Architectural Implications

316 Seiten, Dissertation Universität Bremen (2013), Hardcover, B5

Zusammenfassung / Abstract

This document describes the research results that were obtained from the development of safety-critical software under the principles of open source. Different model-based designs and architectures within the railway control system application domain, including re-usable formalisms for verification & validation, were investigated. The reduction of possible security threats caused by platform or supplier specific adaptations of modelled open-core software was analysed, and a possible solution by the usage of hardware virtualisation, instead of traditional memory management, was elaborated. At core of this work, the development of a graphical domain-specific language for modelling parts of the European Train Control System (ETCS) is presented, which is based on specialised data, control flow formalisms, and language elements derived from the specification document. For a more precise and therefore more appropriate syntax definition for safety-critical systems, the already existing GOPRR meta meta model was extended to the newly developed GOPPRR meta meta model. GOPPRR includes methods for defining constraints by the object constraint language, which supports the definition of static semantics to ensure correct model instances. Parts of the ETCS specification related to the train on-board unit were modelled in a new meta model. To transform the developed model of the ETCS specification into an executable application, a domain framework, according to the new meta model and the corresponding code generator, were designed and implemented, which have implicitly an integrated support for the verification & validation process. To proof the correctness of the modelled specification, the resulting application was executed in a simulative environment to obtain simulation traces. The correspondence of traces to the expected data from the specification document supported the used methods and strategies in this dissertation as proof of concept.