Verification of Cyber Physical Systems
Murali, Dilip Venkateswaran
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Due to the increasing complexity of today\'s cyber-physical systems, defects become inevitable and harder to detect. The complexity of such software is generally huge, with millions of lines of code. The impact of failure of such systems could be hazardous. The reliability of the system depends on the effectiveness and rigor of the testing procedures. Verification of the software behind such cyber-physical systems is required to ensure stability and reliability before the systems are deployed in field. We have investigated the verification of the software for Autonomous Underwater Vehicles (AUVs) to ensure safety of the system at any given time in the field. To accomplish this, we identified useful invariants that would aid as monitors in detecting abnormal behavior of the software. Potential invariants were extracted which had to be validated. The investigation attempts to uncover the possibility of performing this method on existing Software verification platforms. This was accomplished on Cloud9, which is built on KLEE and using the Microsoft\'s VCC tool. Experimental results show that this method of extracting invariants can help in identifying new invariants using these two tools and the invariants identified can be used to monitor the behavior of the autonomous vehicles to detect abnormality and failures in the system much earlier thereby improving the reliability of the system. Recommendations for improving software quality were provided. The work also explored safety measures and standards on software for safety critical systems and Autonomous vehicles. Metrics for measuring software complexity and quality along with the requirements to certify AUV software were also presented. The study helps in understanding verification issues, guidelines and certification requirements.
- Masters Theses