Radar scattering amplitudes contain pole singularities whose importance was recognized in the context of the Singularity Expansion Method: S.E.M. This method uses the fact that the late time domain response rt(t) of a target, illuminated by an E.M. wave, is mainly defined in a frequency band corresponding to the resonance region of the object. The knowledge of the singularities is useful information for discrimination of radar targets and has been used for different purposes of discrimination and identification. In this paper, we propose a modified scheme of radar target identification. The method presented is based on E-Pulse technique. In practical cases, direct application of classical E-Pulse techniques is not very efficient. Its performances are damaged by the characteristics of the exciting signal (antenna output signal). We propose a modified scheme of E-Pulse technique, which allows more accurate target discrimination and improves radar target identification. This procedure requires the deconvolution of the target response by the antenna signal and the application of an equivalent gaussian impulse excitation. This process has been successfully tested to FDTD simulations and measurements in anechoic chamber.
2. Baum, C. E, "SEM backscattering-Kirtland AFB," Interaction Note 476, 1989.
3. Wang, Y., "Complex resonant frequencies for the identification of simple objects in free space and lossy environments," Progress In Electromagnetic Research, Vol. 27, 1-18.
4. Rothwell, E. J., K. M. Chen, P. Nyquist, and W. Sun, "Frequency domain E-Pulse synthesis and target discrimination," IEEE Trans. Antennas Propagation, No. 4, 1987.
5. Audenard, P. and P. Pouliguen, "Amelioration d'un algorithme d'extraction de pË†oles de resonance dans le domaine temporel," DGA-CELAR GEOS/SDM, 2000.
6. Li, Q., P. Ilavarasan, J. E. Ross, E. J. Rothwell, K. M. Chen, and D. P. Nyquist, "Radar target identification using a combined early-time/late-time E-Pulse technique," IEEE Trans. Antennas Propagation, Vol. 46, No. 9, 1998.
7. Rothwell, E. J., K. M. Chen, D. P. Nyquist, P. Ilavarasan, J. E. Ross, R. Bebermeyer, and Q. Li, "A general E-pulse scheme arising from the dual early-time/late-time behavior of radar scatterers," IEEE Trans. Antennas Propagation, Vol. 42, No. 9, 1994.
8. Ilavarasan, P., J. E. Ross, E. J. Rothwell, K. M. Chen, and D. P. Nyquist, "Performance of an automated radar target discrimination scheme using E pulses and S pulses," IEEE Trans. Antennas Propagation, Vol. 41, No. 5, 1993.
9. Mooney, J. E., Z. Ding, and L. S. Riggs, "Performance analysis of an automated E-pulse target discrimination scheme," IEEE Trans. Antennas Propagation, Vol. 48, No. 4, 2000.
10. Younan, N. H., Radar targets identification via a combined Epulse/ SVD-Prony method, Record of IEEE 2000 International, 2000.
11. Chen, K. M., D. P. Nyquist, E. J. Rothwell, P. Ilavarasan, and J. Ross, Transient radar for target identification and detection, Antennas and Propagation Society International Symposium, 1992.
12. Gallego, A., A. Medouri, and M. C. Carrion, "Estimation of number of natural resonance of transient signal using E-pulse technique," Electronics Letters, Vol. 27, No. 24, 1991.