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The the broadband electromagnetic scattering applied research based on efficient modeling method

Author: TianMi
Tutor: HuJun
School: University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Broadband electromagnetic scattering Frequency domain method Interpolation Scattering Center Model
CLC: TN011
Type: Master's thesis
Year: 2008
Downloads: 130
Quote: 1
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Abstract


In recent years, broadband electromagnetic scattering calculated in urgent demand in the field of modern ultra-wideband antenna, synthetic aperture radar, target identification and detection, the urgent need to find a way to fast, accurate, stable and efficient method to simulate and analyze broadband domain response. There are three methods currently calculated broadband electromagnetic field: time domain, frequency domain methods and time-frequency push each other. This article through the analysis and experimental comparison of the three methods described above, drawn to their respective advantages and disadvantages of the computation time, the amount of storage, stability, accuracy, and other aspects. Frequency domain analysis methods commonly used method of moments (MOM) and Fast Fourier Transform (FFT) combining to calculate broadband electromagnetic scattering. With the fast multipole method (FMM) and the multilevel fast multipole algorithm (MLFMA) research and application, frequency domain method to be further developed, and now can be applied to calculate the large target broadband electromagnetic response. Chapter II of this paper pole multilevel fast multipole method (MLFMA) based frequency domain methods broadband electromagnetic scattering its target echo response with the direct calculation results of time-domain method, verify the frequency domain method accuracy and effectiveness, and provide a viable approach for the calculation of complex three-dimensional large target broadband echo. The traditional point frequency method or narrowband method need to calculate the target scattered field at multiple frequency points, when the demand for broadband electromagnetic scattering, the amount of calculation is very large. Interpolation techniques in computational electromagnetics can solve this problem effectively. In the second part, we study the more widely used in a variety of efficient interpolation algorithm, such as progressive waveform approximation (AWE) estimated based on the parameters of the model (MBPE) normalized current interpolation. The above method has been to get rid of the interpolation technique to study the early purely mathematical methods imprecision of the scattered field interpolation shortcomings, combined with the physical principles of computational electromagnetics extracted slowly varying factor with frequency in the solution process for processing, so applied to Broadband electromagnetic scattering calculations have very good results. Guarantee a certain precision in the premise, which greatly saves the calculated amount. Them in the broadband range of applications research and comparative analysis, and investigate its characteristics and scope of application. Radar target recognition in urgent need of a way to solve complex large target broadband electromagnetic scattering algorithm. As a tool for efficient calculation method of electromagnetism frequency domain interpolation method based on the equivalent scattering center model, and the use of radar imaging algorithm signal rotation invariant parameter estimation techniques (ESPRIT) solve the model, based on the principle of scattering centers. Traditional radar imaging signal processing algorithms, the scattered field of the target at different frequencies no longer be measured, but calculated through efficient electromagnetic modeling simulation, the paper by an example not only to verify the method in complex TVU The effectiveness of the size of the target the broadband electromagnetic scattering calculations, also based on the electromagnetic properties of the model will ESPRIT algorithm to make improvements and optimization, to make it more in line with the application of computational electromagnetics model. Interpolation from the urgent needs of the engineering and verified by experiments, the the broadband electromagnetic scattering for solving complex large objects provides a feasible way broadband interpolation algorithm research and calculated a simple goal, to propose a method for complex large objects methods to further improve the calculation system of the of broadband electromagnetic scattering applications.

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