K-Pulse Estimation and Target Identification

Abstract
The unique K pulse of a finite electromagnetic scatter is conceptually defined as a time limited excitation of minimal duration which produces time-limited response waveforms for that specific object at all possible combinations of aspect and radar polarization. As a result of the aspect and polarization invariant feature of the K pulse, it is a useful tool in target identification. In practical applications, to obtain the unique K- pulse is not feasible but generally useful K pulse approximations are in order. The k pulse estimation technique suggested in this dissertation is based on the annihilation of the target's natural resonances under K pulse excitation. This technique basically addresses a simultaneous optimization problem in order to minimize the late-time energy content of the target response at several combinations of aspect and polarization. The K pulse waveform is modeled as an impulse function at the initiation time and then a continuous time-limited function which can be mathematically represented by discrete or continuous basis functions. The suggested K pulse synthesis technique is quite general in the sense that it can be applied to both geometrically simple and complicated targets upon the availability of some band-limited theoretical or measured scattering data.

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