Dissertation > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Radio wave propagation,the propagation mechanism

Medium the conductor composite target electromagnetic scattering analysis of surface integral equation methods

Author YangXingHua
Tutor HuJun
School University of Electronic Science and Technology
Course Electromagnetic Field and Microwave Technology
Keywords The conductor medium compound target Surface integral equation methods Fast multipole method (FMM: Fast Multipole Method) Multilevel fast multipole method ( MLFMA : Multilevel Fast Multipole Algorithm )
Type Master's thesis
Year 2007
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Conductor and dielectric composite target electromagnetic scattering analysis is of great significance for practical engineering applications, especially in the design of radar systems, radar target recognition, strong demand on the application of remote sensing and telemetry, and military objectives of stealth and anti-stealth. However, the complex coupling between the conductor and the media with complex material distribution, leading to such problems of electromagnetic scattering solving difficulties in facing long computing time required for the large amount of computer storage. In this regard, the paper mainly studies the medium of 3D arbitrary shape and uniform dielectric coated conductive target electromagnetic scattering modeling, and efficient solution method. At the division level of the conductor with the medium degree of composite and the method of calculation used for the two basic models (conductor model of the full coating and partial coating conductor model) sub-section conductor medium composite target, based on the surface integral equation combined with various fast algorithms are compared. The first part reviews the calculation of full-coated target radar cross section (RCS) of geometric modeling and based on the principle of equivalence to establish an electric field, magnetic field integral the equation, PMCHW equation, through different combinations of the process of building the TE PMCHW the CFIE PMCHW equation Details the moment method for solving equations and singular integral approach for the later work laid the foundation, and gives the example to examine the accuracy of the program. The second part of this paper a fast multipole method to accelerate the solution speed of the method of moments, to verify the accuracy of the integral equation PMCHW surface of the medium body RCS solving. Last two chapters for coated conductors targets and local the coated conductor goal electromagnetic scattering of fast calculation derivation process discussed on the interface of the edge of the base function of the applied topically goals, and then further multilevel fast multipole method further accelerate the solution speed, reduce memory requirements, so that the surface integral equation can be applied to the calculation of the target LARGE mixed. Text given the large number of examples to test the program accuracy and efficiency, and performance were made based on the surface integral equation method of moments, the fast multipole method, multilevel fast multipole method for solving various mixture target detailed comparison. Conclude that the surface integral equation methods based program has better applicability for various mixture goals, combined with fast algorithms for computational efficiency has greatly improved and can maintain accuracy method of moments. This paper studies for three-dimensional medium body and medium coated conductive structure of the electromagnetic scattering characteristics of a good analytical tool, and the program has a better portability, ease of further optimization in order to get a wider range of applications in engineering. This article also provides a meaningful reference to the research.

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