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PIERS Online
Vol. 3
No. 1
2007
pp: 106-110Adaptive Selection of Sampling Interval in Frequency Domain for Estimating the Poles of ScatterersShaogang Wang, Xinpu Guan, Dangwei Wang, Xingyi Ma, and Yi Su doi:10.2529/PIERS060906033012 Downloads: 934 Abstract:In this paper, the matrix pencil (MP) method has been utilized for estimating the complex natural resonances from IFFT of calculated frequency responses. The novelty is that frequency sampling interval is investigated. The responses are usually computed by the accurate method of moments (MoM) in frequency domain, which is time-consuming. So, the frequency sampling interval's effect on results should be analyzed, and a scheme for adaptive choice of frequency sampling interval is proposed in this paper. The scheme is validated by a special example, a perfect conducting sphere. Lastly, poles of a complex radar target, a missile model, are calculated by the proposed method and compared with other available data.References:1. Hua, Y. and T. K. Sarkar, "Generalized pencil-of-function method for extracting poles of an EM system from its transient response," IEEE Trans. Antennas Propagat., Vol. 37, No. 2, 229-234, 1989. 2. Sarkar, T. K. and O. Pereira, "Using the matrix pencil method to estimate the parameters of a sum of complex exponentials," IEEE Antennas and Propagation Magazine, Vol. 37, No. 1, 48-55, Feb., 1995. 3. Sarkar, T. K., S. Park, J. Koh, and S. M. Rao, "Application of the matrix pencil method for estimating the SEM (singularity expansion method) poles of source-free transient responses from multiple look directions," IEEE Trans. Antennas Propagat., Vol. 48, No. 4, 612-618, 2000. 4. Chauveau, J., N. de Beaucoudrey, and J. Saillard, "Characterization of radar targets in resonance domain with a reduced number of natural poles," Radar Conference, EURAD, 85-88, European, Oct. 6, 2005. 5. Chen, K.-M. and D. Westmoreland, "Impulse response of a conducting sphere based on singularity expansion method," Proceeding of the IEEE, Vol. 69, No. 6, 747-750, June, 1981. 6. Wang, S., X. Guan, X. Ma, D. Wang, and Y. Su, "A fast method of moment to calculate monostatic RCS of arbitrary shaped conducting objects," CIE International Conference on Radar, 2006. 7. Erez, E. and Y. Leviatan, "Analysis of natural frequencies of cavities and scatterers using an impulsive current model," IEEE Trans. Antennas Propagat., Vol. 38, No. 4, 534-540, 1990. |
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