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Systems Engineering and Electronics, Journal of

Issue 4 • Date Dec. 1997

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Displaying Results 1 - 15 of 15
  • [Front cover]

    Page(s): c1
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    Freely Available from IEEE
  • Copyright page

    Page(s): 1
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  • Contents

    Page(s): 1
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    Freely Available from IEEE
  • The new method for calculating poles of a scattering object

    Page(s): 1 - 6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (551 KB)  

    The natural resonances (poles) of a scattering object are important for the target identification. A new method for calculating poles of a scattering object is proposed in this paper. It is shown that the zeros of the Fast Fourier Transform of the integral kernel function are the poles of the scattering object. As an example, the poles of a thin wire conductor are obtained with high precision in very short time by using this method. View full abstract»

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  • Analysis of mechanically tunable frequency selective surfaces

    Page(s): 7 - 16
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1056 KB)  

    The frequency selective surface (FSS) has been widely applied by means of its spatial frequency-filter characteristic, but it is always designed and used as a device with fixed frequency response. In order to tune the resonant frequency and switch the frequency channel, a scheme of mechanically tunable FSS is theoretically analyzed by using the method of Floquet's vector modes expansion and fields matching. A double-layer tunable FSS with dipole element can perform a dynamic range of resonant frequency covering whole X-band. View full abstract»

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  • The electromagnetic scattering by buried complex objects

    Page(s): 17 - 22
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (697 KB)  

    The solution of scattering problem of buried complex bodies needs to not only consider the scattering from the complex bodies, but also apply the boundary conditions in two different types of coordinate systems. This paper applies the conversion technique of vector wave functions combined with the three-dimensional unimoment method to effectively solve this type of complex electromagnetic problem. Using the conversion relations between the cylindrical and spherical vector wave functions, two types of boundary-value problems are conveniently jointed. Both the vector wave function expansion and the multipole expansion belong to eigen function expansion methods and have the same convergence rate. But the former is more rigorous in theory and needs to calculate only two types of eigen components while the latter needs to calculate four types. View full abstract»

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  • On the use of wavelet MoM to solve the EFIE

    Page(s): 23 - 33
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    The recently developed theory of wavelet applied in the Method of Moments (MoM) to solve the electromagnetic field integral equation is presented in this paper. For one dimension problem, we briefly discuss the following aspects: Firstly, two different methods, which are same in essence: the method of the unknown induction current expansion and the method of the integral operator expansion are used to solve the EFIE; Secondly, how to choose the wavelet basis function in wavelet MoM. For two dimension problem, the wavelet MoM is employed and compared with the conventional MoM in CPU time, computational precision and matrix spareness etc. Here, the fast wavelet transform (FWT) is used to compute the matrix elements rapidly and efficiently. Typical numerical results are presented to illustrate the concepts. View full abstract»

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  • EM scattering from rough surface

    Page(s): 34 - 39
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    In this paper, Laplace transform method is used to solve the problem of wave scattering from the rough surface. The rough surface is described by y = ξ(x, z). First, we make Laplace transform to y variable, then do the Fourier transform to x and z variables. In the k space, we can obtain the solution of the problem of wave scattering by simple algebraic operation. Finally, the Laplace inverse transform is performed by complex variable method and Fourier inverse transform by stationary phase method. View full abstract»

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  • Synthesis of load impedances that reduce TE-scattering from conducting cylinder with arbitrary cross section

    Page(s): 40 - 49
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    The reduction of TE-scattering by a conducting cylinder with multiple surface impedance loads is investigated. Synthesis procedures are developed to find the optimal loading which result in zero scattering in the desired directions or at several frequencies. Numerical results of these procedures are presented. The theoretical predictions are confirmed with an experiment. The proposed synthesis procedure is completely general and can be applied to arbitrarily shaped conducting bodies. View full abstract»

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  • Microwave and IF cancellation of leakage signal for spread spectrum radar

    Page(s): 50 - 55
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    This paper discusses the requirements for the cancellation of leakage signal, analyzes in detail the principals of cancelling leakage signal in microwave and IF band, and proposes the schemes to realize adaptive cancellation. Computer analog has shown that the proposed scheme has a very high convergence speed and can reach a high cancellation ratio. View full abstract»

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  • An approach to RCS computation for complex targets

    Page(s): 56 - 60
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (607 KB)  

    A practical approach for calculating the RCS (Radar Cross Section) of complex targets modeled with wire-grid-frame is presented. A way for generating a polyhedron model (facet-wedge model) with the wire-grid-frame data is described. For storing and reading the data of the polyhedron model in an easy way, a data structure is given. View full abstract»

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  • Quantitative estimation of experts' judgments on petroleum exploration

    Page(s): 61 - 66
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    A new method in making judgment matrix is proposed based on a basic value of “importance” and a relative measure level of “importance”. Factors affecting petroleum exploration are analyzed and Experts' judgment matrix on a geologic formation is given. Expected value of each factor is computed and the volume of recoverable oil is estimated. View full abstract»

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  • A fuzzy reasoning system and its heuristic inference algorithm

    Page(s): 67 - 71
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    Based on a presented inference algorithm of fuzzy reasoning, a fuzzy reasoning system is made up. A method of modeling the fuzzy reasoning system, and the setting up of the reasoning knowledge based and reasoning rules are studied in this paper. Then a heuristic inference algorithm is presented according to the system. View full abstract»

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  • Fuzzy logic based evolving system and one kind of competition mechanism

    Page(s): 72 - 78
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    In this paper, an evolving system is introduced. That any system is evolving means that any entity in the system is in developing state and entities compete with each other. Any entity can be represented by development of the entity and its environment consisting of a closed cycle. Any subsystem is assigned by a management. The competing controller controls competing entities and arranges them in any advantage order by its common rules and local rules of any subsystem. Each entity can use its competing rules to change the evaluation by any subsystem containing it. This kind of changes leads the entity into its increase of the position in an advantage order. View full abstract»

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  • The implementation of fault diagnostic expert system for personal computer

    Page(s): 79 - 81
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (361 KB)  

    In this paper a PC fault diagnostic expert system (PCDGES) is introduced, which can be run under CCDOS and encoded by English Prolog and C. In the system, a method of combining logic with production rules is applied to represent knowledge. The expert system program is separated from knowledge base. Inference computation is mainly carried backward, and the forward is regarded as an auxiliary inference. The knowledge base can be easily updated, deleted and added in operation time. It has a supporting machanism for the acquisition of knowledge and by means of “telling method”, knowledge can be acquisited. The system also has “why” explanation function and an interface with DOS, full screen editor, and hardware dignostic program. For Chinese users, all the prompt information and selection menus are displayed in color Chinese. View full abstract»

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Aims & Scope

Journal of Systems Engineering and Electronics reports the latest developments and achievements in both theoretical and practical aspects of systems engineering, electronics and related research areas.

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Professor Rong Shi
Journal of Systems Engineering and Electronics