Pole Feature Extraction And E-Pulse Target Discrimination For Ultra Wide-Band Radar

The complex resonance frequency underlying in late-time scattering components of a conducting target is independent of waveform and polarization of the incident wave, as well as the direction of the target relative to radar. It is a unique aspect independent quantity so far used to characterize target physical structure and component. Furthermore, the computation cost in target discrimination based on the pole is very small. So the pole is an efficiency character of target for automatic target recognition.In this paper, we analyzed the theory of several linear methods for the pole extraction, such as Prony method, KT method and matrix pencil method. Then, numerous results based on scattering responses synthesized from weighted sums of two exponentially damped sinusoids are provided to compare theirs performance. Usually these pole extraction methods are poor when the value of the residual corresponding to the pole is small. In order to avoid the disadvantages, the matrix pencil method for the pole extraction of transient responses from multiple look direction is introduced. After a detail analysis for the traditional E pulse target discrimantion technique, a modified E-pulse energy discrimination numbers is proposed, and its probability distribution characteristic is analyzed. Simulations using numerically calculated scattering response based on three thin wire target demonstrate that the method proposed in this paper is surprier to the traditional E-pulse.