volume | PIER Journals

Abstract

This paper deals with a technique for classifying jet aircrafts from JEM (Jet Engine Modulation) signal. A novel method to recognize an engine model by analyzing JEM spectrum using frequency mask is proposed. The frequency mask extracts and analyses the spectral component at the frequencies that are predicted from the blade number of a jet engine and the estimated spool rate. The proposed method does not need a complicated logical algorithm for finding the chopping frequency or the pre-simulated engine spectra used in previous methods. In addition, we suggest a method to precisely estimate the spool rate in the spectrum domain of JEM signal, which plays an important role in generating the frequency mask. The classification experiments using the JEM signals measured from two fabricated engine models verify that the proposed algorithm has good performance in the recognition of jet aircrafts.

1. Skolnik, M. I., Introduction to Radar Systems, 3rd Ed., McGraw-Hill, 2001.

2. Tait, P., Introduction to Radar Target Recognition, IEE, 2005.
doi:10.1049/PBRA018E

3. Yang, W. Y., J. H. Park, W. Y. Song, and N. H. Myung, "Robust and fast algorithm for estimating fundamental periodicity of jet engine modulation signals," IET Radar, Sonar & Navigation, Vol. 10, No. 7, 1286-1294, 2016.
doi:10.1049/iet-rsn.2015.0526

4. Yang, W. Y., J. H. Park, J. W. Bae, S. C. Kang, and N. H. Myung, "Automatic feature extraction from jet engine modulation signals based on an image processing method," IET Radar, Sonar & Navigation, Vol. 9, No. 7, 783-789, 2015.
doi:10.1049/iet-rsn.2014.0281

5. Park, J. H., W. Y. Yang, J. W. Bae, S. C. Kang, and N. H. Myung, "Extended high resolution range profile-jet engine modulation analysis with signal eccentricity," Progress In Electromagnetics Research, Vol. 142, 505-521, 2013.
doi:10.2528/PIER13080102

6. Chadwick, J. and G. L. Williams, "Air target identification --- Concept to reality," IET International Conference on Radar Systems, 1-5, 2007.

7. Bell, M. R. and R. A. Grubbs, "JEM modeling and measurement for radar target identification," IEEE Transactions on Aerospace and Electronic Systems, Vol. 29, No. 1, 73-87, 1993.
doi:10.1109/7.249114

8. Martin, J. and B. Mulgrew, "Analysis of the theoretical radar return signal from aircraft propeller blades," IEEE International Radar Conference, 569-572, 1990.
doi:10.1109/RADAR.1990.201091

9. Martin, J. and B. Mulgrew, "Analysis of the effect of blade pitch on the return signal from rotating aircraft blades," IEE Radar 92 International Conference, 446-449, Brighton, UK, 1992.

10. Tong, C., Z. Huang, P. Yan, et al. "Studies of modulation mechanism of jet engine modulation effect," IEEE Microwave Conference Proceedings, APMC 2005 Proceedings, Vol. 3, 2005.

11. Cuomo, S., P. F. Pellegrini, and E. Piazza, "Model validation for jet engine modulation phenomenon," Electronics Letters, Vol. 30, No. 24, 2073-2074, 1994.
doi:10.1049/el:19941369

12. French, A., Target recognition techniques for multifunction phased array radar, Thesis for the degree of Doctor of Philosophy of the University College London, 2010.

13. Oppenheim, A. V. and R. W. Schafer, Discrete-time Signal Processing, Prentice-Hall, 1989.

14. Lim, H., G. H. Yoo, C. H. Kim, K. I. Kwon, and N. H.Myung, "Radar cross section measurements of a realistic jet engine structure with rotating parts," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 7, 999-1008, 2011.
doi:10.1163/156939311795253993

Dr. Si-Ho Kim

Dr. Chan Hong Kim

Dr. Dae-Young Chae

Dr. Sang In Lee