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The singularity expansion method (SEM) assumes that the electromagnetic scattering wave of an object has a fixed poles distribution, i.e. the resonant frequency is fixed. So the object can be identified by extracting poles from radar data. While studying ground penetrating radar (GPR) echo signal features of nonmetallic pipelines, the paper finds that the GPR signal's frequency center downshifts when...
This paper focuses on model reduction of dynamical systems described by differential-algebraic equations. After transforming the system to the Weierstrass canonical form, the system is decomposed as a slow subsystem and a fast subsystem, which are then combined in parallel interconnection. Based on the solutions of these two subsystems, a new definition of the Hankel operator is given. Then, the conventional...
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