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Synthesis of Admissible Shields

  • Laura Humphrey
  • Bettina KönighoferEmail author
  • Robert Könighofer
  • Ufuk Topcu
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10028)

Abstract

Shield synthesis is an approach to enforce a set of safety-critical properties of a reactive system at runtime. A shield monitors the system and corrects any erroneous output values instantaneously. The shield deviates from the given outputs as little as it can and recovers to hand back control to the system as soon as possible. This paper takes its inspiration from a case study on mission planning for unmanned aerial vehicles (UAVs) in which k-stabilizing shields, which guarantee recovery in a finite time, could not be constructed. We introduce the notion of admissible shields, which improves k-stabilizing shields in two ways: (1) whereas k-stabilizing shields take an adversarial view on the system, admissible shields take a collaborative view. That is, if there is no shield that guarantees recovery within k steps regardless of system behavior, the admissible shield will attempt to work with the system to recover as soon as possible. (2) Admissible shields can handle system failures during the recovery phase. In our experimental results we show that for UAVs, we can generate admissible shields, even when k-stabilizing shields do not exist.

Keywords

Unmanned Aerial Vehicle Safety Property Winning Strategy Safety Specification Admissible Strategy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing AG 2016

Authors and Affiliations

  • Laura Humphrey
    • 1
  • Bettina Könighofer
    • 2
    Email author
  • Robert Könighofer
    • 2
  • Ufuk Topcu
    • 3
  1. 1.Control Science Center of Excellence, AFRLWright-Patterson AFBUSA
  2. 2.IAIKGraz University of TechnologyGrazAustria
  3. 3.University of Texas at AustinAustinUSA

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