volume | PIER Journals

Abstract

The high-frequency method for the prediction of the terahertz (THz) radar cross section (RCS) of conductive targets with extremely electrically large size in free space was presented. In order to consider the scattering fields of the perfectly electric conducting (PEC) targets with extremely electrically large size in free space, the Green's function was introduced into the conventional physical optics (PO) method which was combined with the graphical electromagnetic computing (GRECO) method and improved using the partition display algorithm. The shadow regions were eliminated quickly by displaying lists of OpenGL to rebuild the targets, and the geometry information was attained by reading the color and depth of each pixel. The THz RCS of conductive targets can be exactly calculated in free space. The RCS comparison between the partition display GRECO prediction by the self-written Visual C++ 2010 program and the simulation of FEKO software with the large element PO method proves the validity and accuracy of the proposed method. The results provide an important basis and method for the potential applications of THz radar in many fields such as military, astronomy and remote sensing.

1. Li, H. Y., Q. Li, K. Xue, et al. "Research into in°uence of Gaussian beam on terahertz radar cross section of a conducting cylinder," Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 34, No. 34, 289-298, 2013.
doi:10.1007/s10762-013-9962-x

2. Li, H. Y., Q. Li, Z. W. Xia, et al. "Influence of Gaussian beam on terahertz radar cross section of a conducting sphere," Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 34, No. 1, 88-96, 2013.
doi:10.1007/s10762-012-9950-6

3. Li, X. F., Y. J. Xie, and R. Yang, "High-frequency method for scattering from coated targets with electrically large size in half space," IET Microw. Antennas Propag., Vol. 3, No. 2, 181-186, 2009.
doi:10.1049/iet-map:20070287

4. Li, X. F., Y. J. Xie, and R. Yang, "High-frequency method analysis on scattering from homogenous dielectric objects with electrically large size in half space," Progress In Electromagnetics Research B, Vol. 1, 177-188, 2008.
doi:10.2528/PIERB07103001

5. Li, X. F., Y. J. Xie, P. Wang, et al. "High-frequency method for scattering from electrically large conductive targets in half-space," IEEE Antennas and Wireless Propagation Letters, Vol. 6, 259-262, 2007.
doi:10.1109/LAWP.2007.897509

6. Hazlett, M. A., D. J. Andersh, S. W. Lee, et al. "XPATCH: A high frequency electromagnetic scattering prediction code using shooting and bouncing rays," Proc. SPIE, Targets and Backgrounds: Characterization and Representation, Vol. 2469, 266-275, 1995.
doi:10.1117/12.210627

7. Andersh, D. J., J. Moore, S. Kosanovich, et al. "Xpatch 4: The next generation in high frequency electromagnetic modeling and simulation software," Proc. of the IEEE International Radar Conference, 844-849, 2000.

8. Zhou, M. J., J. Lu, Q. Chang, et al. "SAR image simulation systems based on RadBase and Vega," Modern Radar, Vol. 31, No. 3, 27-30, 2009.

9. Yuan, X., T. Tang, Y. Li, et al. "SAR image classification by image intensity similarity and kernel method," Proc. of the 5th IEEE International Congress on Image and Signal Processing (CISP), 1386-1389, 2012.

10. Roedder, J. M., "CADDSCAT Version 2.3: A high-frequency physical optics code modified for trimmed IGES B-spline surfaces," IEEE Antennas and Propagation Magazine, Vol. 41, No. 3, 69-80, 1999.
doi:10.1109/74.775250

11. Youssef, N. N., "Radar cross section of complex targets," Proc. of the IEEE, Vol. 77, No. 5, 722-734, 1989.
doi:10.1109/5.32062

12. Song, J. M., C. C. Lu, W. C. Chew, et al. "Fast Illinois solver code (FISC)," IEEE Antennas and Propagation Magazine, Vol. 40, No. 3, 27-34, 1998.
doi:10.1109/74.706067

13. Song, J. M. and W. C. Chew, "Large scale computations using FISC," Proc. of the IEEE Antennas and Propagation Society International Symposium, Vol. 4, 1856-1859, 2000.

14. Turner, S. D., "RESPECT: Rapid electromagnetic scattering predictor for extremely complex targets," IEE Proceedings F (Radar and Signal Processing), Vol. 137, No. 4, 214-220, 1990.
doi:10.1049/ip-f-2.1990.0033

15. FEKO "Comprehensive electromagnetic solutions,", Accessed Dec. 16, 2013, Available: http://www.feko.info.

16. Rius, J. M., M. Ferrando, and L. Jofre, "High-frequency RCS of complex radar targets in real-time," IEEE Trans. Antenn. Propag., Vol. 41, No. 9, 1308-1319, 1993.
doi:10.1109/8.247759

17. Rius, J. M., M. Ferrando, and L. Jofre, "GRECO: Graphical electromagnetic computing for RCS prediction in real time," IEEE Antennas and Propagation Magazine, Vol. 35, No. 2, 7-17, 1993.
doi:10.1109/74.207645

18. Domingo, M., F. Rivas, J. Perez, et al. "Computation of the RCS of complex bodies modeled using NURBS surfaces," IEEE Antennas and Propagation Magazine, Vol. 37, No. 6, 36-47, 1995.
doi:10.1109/74.482030

19. Knott, E. F., "A progression of high-frequency RCS prediction techniques," Proc. of the IEEE, Vol. 73, No. 2, 252-264, 1985.
doi:10.1109/PROC.1985.13137

20. Knott, E. F., Radar Cross Section, 183-224, SciTech Publishing, North Carolina, 2004.

21. Ruan, Y. Z., Radar Cross Section and Stealth Technology, National Defense Industry Press, Beijing, 1998.

22. Nie, Z. P. and D. G. Fang, "Target and Environment Electromagnetic Scattering Modeling: Theory, Methodology and Implementation," Applications Chapter, 202{228, National Defense Industry Press, Beijing , 2009.

23. Zhu, K. L. and W. X.Wang, "Missile Encyclopedic Dictionary," China Astronautic Publishing House, Beijing, 34-38, 2001.

24. Crispin, J. W. and A. L. Maffett, "Radar cross-section estimation for simple shapes," Proc. of the IEEE, Vol. 53, No. 8, 833-848, 1965.
doi:10.1109/PROC.1965.4062

25. Crispin, J. W. and A. L. Maffett, "Radar cross-section estimation for complex shapes," Proc. of the IEEE, Vol. 53, No. 8, 972-982, 1965.
doi:10.1109/PROC.1965.4076

Dr. Houqiang Hua

Prof. Yue-Song Jiang

Dr. Yuntao He