SpaceEx: scalable verification of hybrid systems

  • Authors:
  • Goran Frehse;Colas Le Guernic;Alexandre Donzé;Scott Cotton;Rajarshi Ray;Olivier Lebeltel;Rodolfo Ripado;Antoine Girard;Thao Dang;Oded Maler

  • Affiliations:
  • Verimag, CNRS, Université Grenoble 1 Joseph Fourier, Gières, France;New York University, CIMS, New York, NY;Verimag, CNRS, Université Grenoble 1 Joseph Fourier, Gières, France;Verimag, CNRS, Université Grenoble 1 Joseph Fourier, Gières, France;Verimag, CNRS, Université Grenoble 1 Joseph Fourier, Gières, France;Verimag, CNRS, Université Grenoble 1 Joseph Fourier, Gières, France;Verimag, CNRS, Université Grenoble 1 Joseph Fourier, Gières, France;Laboratoire Jean Kuntzmann, Université de Grenoble;Verimag, CNRS, Université Grenoble 1 Joseph Fourier, Gières, France;Verimag, CNRS, Université Grenoble 1 Joseph Fourier, Gières, France

  • Venue:
  • CAV'11 Proceedings of the 23rd international conference on Computer aided verification
  • Year:
  • 2011

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Abstract

We present a scalable reachability algorithm for hybrid systems with piecewise affine, non-deterministic dynamics. It combines polyhedra and support function representations of continuous sets to compute an over-approximation of the reachable states. The algorithm improves over previous work by using variable time steps to guarantee a given local error bound. In addition, we propose an improved approximation model, which drastically improves the accuracy of the algorithm. The algorithm is implemented as part of SpaceEx, a new verification platform for hybrid systems, available at spaceex.imag.fr. Experimental results of full fixed-point computations with hybrid systems with more than 100 variables illustrate the scalability of the approach.