Abstract
In order to verify the real-time reliability of unmanned aerial vehicle (UAV) flight control system and comply with the airworthiness certification standard, we proposed a model-based integration framework for modeling and verification of time property. Combining with the advantages of MARTE, this framework uses class diagram to create the static model of software system, and utilizes state chart to create the dynamic model. In term of the defined transformation rules, the MARTE model could be transformed to formal integrated model, and the different part of the model could also be verified by using existing formal tools. For the real-time specifications of software system, we also proposed a generating algorithm for temporal logic formula, which could automatically extract real-time property from time-sensitive live sequence chart (TLSC). Finally, we modeled the simplified flight control system of UAV to check its real-time property. The results showed that the framework could be used to create the system model, as well as precisely analyze and verify the real-time reliability of UAV flight control system.
Highlights
unmanned aerial vehicle (UAV) has been used in a vast range of civil and military applications, and brought accidents caused by airborne software failure[1,2,3], we expect to develop a high reliable UAV flight control system
The software architecture of UAV flight control system mainly consists of communication link (CL) module, sensor signal processing module, flight guidance (FG) module, servo control (SC) module, mode supervise (MS) module and PWM steering output modules
We specially focused on the model and verification of time property, which is not considered by most integration framework
Summary
UAV has been used in a vast range of civil and military applications, and brought accidents caused by airborne software failure[1,2,3], we expect to develop a high reliable UAV flight control system. In the development of airborne software, object-oriented technology benefits the generation of source code for test and certification via model driven architecture (MDA) or MARTE tool It can improve the reusability and validity of software. Analyze and validate a candidate UAV software design, Yew Chai Paw et al proposed a model-based framework, which integrates a set of design tools to realize software model synthesis, off-line and real-time simulation[1]. As MARTE is a graphical model, we proposed a formal PTA-OZ model and constructed its model transformation rules Using these rules, we can translate both static models and dynamic models into corresponding Object-Z model and PTA models, which are fit for system real-time reliability verification and code automatic generation.
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