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2007-11-21
Computation of EM Field Scattered by an Open-Ended Cavity and by a Cavity Under Radome Using the Iterative Physical Optics
By
Progress In Electromagnetics Research, Vol. 80, 77-105, 2008
Abstract
It is always a challenge to predict Radar Cross Section (RCS) of a full scale military platform with a good accuracy. Most of the time antennas and cavities are the main contributors of aircrafts RCS. Several methods have been developed to compute the RCS of cavities such as analytical methods (modal methods) and asymptotic methods (geometrical optics (GO) methods and physical optics (PO) methods). This article presents the Iterative Physical Optics (IPO) method which consists in an iterative resolution of the Magnetic Field Integral Equation (MFIE) to compute the currents on the inner walls of the cavity. This method allows computing arbitrarily shaped cavity with a good accuracy even for cavity with a depth inferior to the wavelength. Comparisons of IPO results with Rays and Finite element methods show a better accuracy of IPO than Rays especially for cross polarization. But computation time represents one of the main limitations of the IPO method. We present here a new formulation of the Segmented IPO method which coupled with the generalized reciprocity theorem decreases significantly the complexity of the method and consequently the computation time. The S-IPO method has been validated by comparisons with Modal method and measurements. We have observed that the repartition of the electric currents density on the inner walls of the cavity is quite the same with IPO and S-IPO computations. Lastly we propose an evolution of the IPO method we have developed to compute the RCSof cavities under radome. This method has been validated by comparison with finite element results.
Citation
Régis Hémon, Philippe Pouliguen, Hongyang He, Joseph Saillard, and Jean-Francois Damiens, "Computation of EM Field Scattered by an Open-Ended Cavity and by a Cavity Under Radome Using the Iterative Physical Optics," Progress In Electromagnetics Research, Vol. 80, 77-105, 2008.
doi:10.2528/PIER07110803
References

1. Anastassiu, H. T., "A review of electromagnetic scattering analysis for inlets, cavities and open ducts," IEEE Antennas and Propagation Magazine, Vol. 45, No. 6, 27-40, 2003.
doi:10.1109/MAP.2003.1282177

2. Ling, H., S. W. Lee, and R. C. Chou, "High-frequency RCS of open cavities with rectangular and circular cross sections," IEEE Trans. Antennas Propagation, Vol. 37, No. 5, 648-654, 1989.
doi:10.1109/8.24193

3. Altintas, A., P. H. Pathak, and M. C. Liang, "A selective modal scheme for the analysis of EM coupling into or radiation from large open-ended waveguides," IEEE Trans. Antennas Propagation, Vol. 36, No. 1, 84-96, 1988.
doi:10.1109/8.1077

4. He, H., "RCSprediction of cavities," Thesis for the Degree of Master Research of Electronics to Ecole Polytechnique of University of Nantes, No. 7, 2006.

5. Pathak, P. H. and R. J. Burkholder, "Modal, ray, and beam techniques for analyzing the EM scattering by open-ended waveguide cavities," IEEE Trans. Antennas Propagation, Vol. 37, No. 5, 635-647, 1989.
doi:10.1109/8.24192

6. Pathak, P. H. and R. J. Burkholder, "A reciprocity formulation for the EM scattering by an obstacle within a large open cavity," IEEE Trans. Antennas Propagation, Vol. 41, No. 4, 702-707, 1993.

7. Burkholder, R. J., R. C. Chou, and P. H. Pathak, "Two ray shooting methods for computing the EM scattering by large openended cavities," Computer Physics Communications, No. 68, 353-365, 1991.
doi:10.1016/0010-4655(91)90209-4

8. Ling, H., R. C. Chou, and S. W. Lee, "Shooting and bouncing rays: Calculating the RCSof an arbitrarily shaped cavity," IEEE Trans. Antennas Propagation, Vol. 37, No. 2, 194-205, 1989.
doi:10.1109/8.18706

9. Syed, H. H. and J. L. Volakis, "Electromagnetic scattering by coated convex surfaces and wedges simulated by approximate boundary conditions," Ph.D. Thesis, 1992.

10. Ruck, G. T., D. E. Barrick, W. D. Stuart, and C. K. Krichbaum, Radar Cross Section Handbook, Vol. 2, 473-484, Vol. 2, 1970.

11. Obelleiro, F., J. L. Rodriguez, and A. G. Pino, "A Progressive Physical Optics (PPO) method for computing the electromagnetic scattering of large open-ended cavities," Microwave and Optical Technology Letter s, Vol. 14, No. 3, 1997.

12. Obelleiro, F., J. L. Rodriguez, and R. J. Burckholder, "An iterative physical optics approach for analyzing the electromagnetic scattering by large open-ended cavities," IEEE Trans. Antennas Propagation, Vol. 43, No. 4, 356-361, 1995.
doi:10.1109/8.376032

13. Obelleiro, F., M. G. Araujo, and J. L. Rodriguez, "Iterative physical optics formulation for analyzing large waveguides with lossy walls," Microwave and Optical Technology Letter, Vol. 28, No. 1, 21-26, 2001.
doi:10.1002/1098-2760(20010105)28:1<21::AID-MOP6>3.0.CO;2-4

14. Tadokoro, M. and K. Hongo, "Measurement of RCSfrom a dielectric coated cylindrical cavity and calculation using IPO EIBC," ICEAA, 2001.

15. Obelleiro, F., J. Campos-Ni˜no, J. L. Rodriguez, and A. G. Pino, "A segmented approach for computing the electromagnetic scattering of large and deep cavities," Progress In Electromagnetic Research, Vol. 19, 129-145, 1998.
doi:10.2528/PIER97100700

16. Burkholder, R. J., "A fast and rapidly convergent iterative physical optics algorithm for computing the RCSof open-ended cavities," ACES Journal, Vol. 16, No. 1, 2001.

17. Lu, C. C. and W. C. Chew, "Fast far-field approximation for calculating the RCSof large objects," Microwave and Optical Technology Letters, Vol. 8, No. 5, 1995.
doi:10.1002/mop.4650080506

18. Boag, A., "A Fast Iterative Physical Optics (FIPO) algorithm based on non-uniform polar grid interpolation," Microwave and Optical Technology Letters, Vol. 35, No. 3, 2002.
doi:10.1002/mop.10568

19. Boag, A., "A fast physical optics algorithm for double-bounce scattering," IEEE Trans. Antennas Propagation, Vol. 52, No. 1, 2004.

20. Tokgöz, C. and C. J. Reddy, "Fast radar cross section computation by using iterative physical optics method in conjunction with adaptive model based parameter estimation," IEEE-APS, No. 7, 2006.

21. Burkholder, R. J. and T. Lundin, "Forward-backward iterative physical optics algorithm for computing the RCSof open-ended cavities," IEEE Trans. Antennas Propagation, Vol. 53, No. 2, 793-799, 2005.
doi:10.1109/TAP.2004.841317

22. Zhang, P. F. and S. X. Gong, "Improvement on the forwardbackward iterative physical optics algorithm apllied to compute the RCSof large open-ended cavities," J. of Electromagnetic Waves and Appl., Vol. 21, No. 4, 457-469, 2007.
doi:10.1163/156939307779367297

23. Hemon, R., P. Pouliguen, J. Saillard, and J. F. Damiens, "Computation of scattered fields by cavities with radome," IEEEAPS, No. 7, 2006.

24. Hemon, R., P. Pouliguen, J. Saillard, H. He, and J. F. Damiens, "Evolution and parametrical studies of IPO method," IEEE-APS, No. 6, 2007.