Before revision: The aim of the work is to stabilize the unstable index-1 descriptor systems by Riccati-based feedback stabilization via a modified form interpolatory projection-based technique Iterative Rational Krylov Algorithm (IRKA) . The basic IRKAis used to find Reduced Order Models (ROMs) for the stable systems conveniently but it is unsuitable for the unstable systems .
After revision: The aim of the work is to stabilize the unstable index-1 descriptor systems by Riccati-based feedback stabilization via a modified form interpolatory projection-based technique Iterative Rational Krylov Algorithm (IRKA) , which is a bi-tangential interpolation-based technique. In the basic IRKA, for the stable systems the Reduced Order Models (ROMs) for the stable systems conveniently but it is unsuitable for the unstable systems .