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Systems Engineering and Electronics, Journal of

Issue 1 • Date Feb. 2009

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Displaying Results 1 - 25 of 38
  • [Front cover]

    Publication Year: 2009 , Page(s): c1
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  • Copyright page

    Publication Year: 2009 , Page(s): 1
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  • Call for papers: International conference on space information technology

    Publication Year: 2009 , Page(s): 1
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  • Instructions for authors

    Publication Year: 2009 , Page(s): 1
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  • Contents

    Publication Year: 2009 , Page(s): 1 - 2
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  • Image edge detection based on beamlet transform

    Publication Year: 2009 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2295 KB)  

    Combining beamlet transform with steerable filters, a new edge detection method based on line gradient is proposed. Compared with operators based on point local properties, the edge-detection results with this method achieve higher SNR and position accuracy, and are quite helpful for image registration, object identification, etc. Some edge-detection experiments on optical and SAR images that demonstrate the significant improvement over classical edge operators are also presented. Moreover, the template matching result based on edge information of optical reference image and SAR image also proves the validity of this method. View full abstract»

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  • Research of optimizing the microwave wide band blackbody calibration target

    Publication Year: 2009 , Page(s): 6 - 12
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (3322 KB)  

    The blackbody calibration targets applied for microwave radiometer's prelaunch calibration are optimized with its electromagnetic and thermal characteristics. Based on the method of emissivity optimization with radar cross section (RCS) simulation and the method of subgrid finite difference time domain (FDTD), the following design rules are summarized: that the round wedge is better than the square one, the best ratio from height to bottom radius is 4: 1, for wide band calibration, the multilayer absorbing material coating is efficient to increase the emissivity, and the gradual thickness absorbing material coating is helpful to guarantee the uniform distribution of surface temperature even as it keeps a higher emissivity. Finally following the above conclusions, a new type of blackbody calibration target with the cellular array is preferred to improve the uniformity of polarization, which will increase the performance of the calibration targets further. View full abstract»

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  • Combining Radon-ambiguity transform with second-order difference to improve detection probability of LFM signals in low SNR

    Publication Year: 2009 , Page(s): 13 - 19
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2226 KB)  

    The Radon-ambiguity transform (RAT), although efficient for detecting the linear frequency modulated signals (LFMs), is troubled by the energy accumulation of noise in low signal-to-noise ratio (SNR). A second-order difference (SOD) method is proposed to treat with this problem. In the SOD method, the optimal search step and difference step are derived from the LFM rate resolution formula. The sharpness of the peaks of RAT is measured by curvature, and the sharpness, but not the magnitude of the peaks, is used to detect the LFMs. The SOD method removes the noise energy accumulation and reserves the drastically changing components integrally; thus, it improves the detection probability of LFMs in low SNR. The expected performance of the new method is verified by 100 Monte Carlo simulations. View full abstract»

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  • Narrow-band interference excision in spread-ssystems using new N-sigma algorithm based on fuzzy threshold

    Publication Year: 2009 , Page(s): 20 - 26
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1673 KB)  

    The key to narrow-band interference excision in frequency domain is to determine the excision threshold in direct-sequence spread-spectrum (DS-SS) systems. The excision threshold is a non-linear function related to the number and the power of interference, and attempting to get the exact relation of threshold related to the number and the power of interference is almost impossible. The N-sigma algorithm determines the excision threshold using subsection function; however, the excision threshold determined by this method is not exact. A new method to determine the threshold of N-sigma algorithm is proposed. The new method modifies the scale factor N by use of the membership function. The threshold determined by this method is consecutive and smooth, and it is closer to the fact than that of the initial N-sigma algorithm. The G PS signal and single-tone (CW) interference (that is, typical narrow-band interference) are implemented in the simulation, and the results are presented to demonstrate the validity of the new algorithm. View full abstract»

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  • Performance analysis of Turbo-Codes in communication channels with impulsive noise

    Publication Year: 2009 , Page(s): 27 - 31
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1312 KB)  

    Performance of Turbo-Codes in communication channels with impulsive noise is analyzed. First, mathematical model of impulsive noise is presented because it has non-Gaussian nature and is found in many wireless channels due to impulsive phenomena of radio-frequency interference. Then, with linear Log-MAP decoding algorithm for its low complexity, Turbo-Codes are adopted and analyzed in such communication channels. To confirm the performance of the proposed method, simulations on both static and fully interleaved flat Rayleigh fading channels with impulsive noise have been carried out. It is shown that Turbo-Codes have a better performance than the conventional methods (e.g. convolutionally coded system). View full abstract»

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  • Fast view prediction for stereo images based on Delaunay triangular mesh model

    Publication Year: 2009 , Page(s): 32 - 40
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (6498 KB)  

    The view prediction is an important step in stereco /rnultiview video coding, wherein, disparity estimation (DE) is a key and difficult operation. DE algorithms usually require enormous computing power. A fast DE algorithm based on Delaunay triangulation (DT) is proposed. First, a flexible and content adaptive DT mesh is established on a target frame by an iterative split-merge algorithm. Second, DE on DT nodes are performed in a three-stage algorithm, which gives the majority of nodes a good estimate of the disparity vectors (DV), by removing unreliable nodes due to occlusion, and forcing the minority of 'problematic nodes' to be searched again, within their umbrella-shaped polygon, to the best. Finally, the target view is predicted by using affine transformation. Experimental results show that the proposed algorithm can give a satisfactory DE with less computational cost. View full abstract»

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  • Low complexity method for spreading sequence estimation of DSSS signal in non-cooperative communication systems

    Publication Year: 2009 , Page(s): 41 - 49
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2304 KB)  

    It is a necessary step to estimate the spreading sequence of direct sequence spread spectrum (DSSS) signal for blind despreading and demodulation in non-cooperative communications. Two innovative and effective detection statistics are proposed to implement the synchronization and spreading sequence estimation procedure. The proposed algorithm also has a low computational complexity with only linear additions and modifications. Theoretical analysis and simulation results show that the algorithm performs quite well in low SNR environment, and is much better than all the existing typical algorithms with a comprehensive consideration both in performance and computational complexity. View full abstract»

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  • Scale invariant features extraction for stereo vision

    Publication Year: 2009 , Page(s): 50 - 54
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2585 KB)  

    Stable local feature detection is a fundamental component of many stereo vision problems such as 3-D reconstruction, object localization, and object tracking. A robust method for extracting scale-invariant feature points is presented. First, the Harris corners in three-level pyramid are extracted. Then, the points detected at the highest level of the pyramid are correctly propagated to the lower level by pyramid based scale invariant (PBSI) method. The corners detected repeatedly in different levels are chosen as final feature points. Finally, the characteristic scale is obtained based on maximum entropy method. The experimental results show that the algorithm has low computation cost, strong antinoise capability, and excellent performance in the presence of significant scale changes. View full abstract»

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  • Design and implementation of 1 GHz high speed data acquisition system

    Publication Year: 2009 , Page(s): 55 - 59
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1561 KB)  

    With the development of current electronic technology, numerous high-speed data acquisition systems provide a variety of potential benefits. This article describes a high-speed data acquisition system which consists of ECL logic and TTL logic devices, samples and stores data with a 1 GHz Hz clock. This system is accomplished easily and works stably. A performance test of this system has been undertaken and the results show that the effective number of bits (ENOB) is more than 6.5 bits. View full abstract»

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  • GPS dynamic cycle slip detection and correction with baseline constraint

    Publication Year: 2009 , Page(s): 60 - 64
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1564 KB)  

    When the cycle slips take place in the attitude determination of a moving platform, the precision of the attitude will be impaired badly. A method of cycle slip detection and correction is proposed, which is suitable to the dynamic measurement using GPS carrier phase: the cycle slips detection is first achieved by triple difference observables, then the cycle slips correction is performed with baseline length constraint. The simulation results show that the proposed method is effective to the dynamic cycle slips problem. View full abstract»

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  • Support vector regression model for complex target RCS predicting

    Publication Year: 2009 , Page(s): 65 - 68
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1143 KB)  

    The electromagnetic scattering computation has developed rapidly for many years; some computing problems for complex and coated targets cannot be solved by using the existing theory and computing models. A computing model based on data is established for making up the insufficiency of theoretic models. Based on the “support vector regression method”, which is formulated on the principle of minimizing a structural risk, a data model to predicate the unknown radar cross section of some appointed targets is given. Comparison between the actual data and the results of this predicting model based on support vector regression method proved that the support vector regression method is workable and with a comparative precision. View full abstract»

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  • Approach for wideband direction-of-arrival estimation in the presence of array model errors

    Publication Year: 2009 , Page(s): 69 - 75
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2190 KB)  

    The presence of array imperfection and mutual coupling in sensor arrays poses several challenges for development of effective algorithms for the direction-of-arrival (DOA) estimation problem in array processing. A correlation domain wideband DOA estimation algorithm without array calibration is proposed, to deal with these array model errors, using the arbitrary antenna array of omnidirectional elements. By using the matrix operators that have the memory and oblivion characteristics, this algorithm can separate the incident signals effectively. Compared with other typical wideband DOA estimation algorithms based on the subspace theory, this algorithm can get robust DOA estimation with regard to position error, gain-phase error, and mutual coupling, by utilizing a relaxation technique based on signal separation. The signal separation category and the robustness of this algorithm to the array model errors are analyzed and proved. The validity and robustness of this algorithm, in the presence of array model errors, are confirmed by theoretical analysis and simulation results. View full abstract»

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  • Detection of weak target for MIMO radar based on Hough transform

    Publication Year: 2009 , Page(s): 76 - 80
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1571 KB)  

    An effective method of multiple input multiple output (MIMO) radar weak target detection is proposed based on the Hough transform. The detection time duration is divided into multiple coherent processing intervals (CPIs). Within each CPI, conventional methods such as fast Fourier transform (FFT) is exploit to coherent integrating in same range cell. Furthermore, noncoherent integration through several range cells can be implemented by Hough transform among all CPIs. Thus, higher integration gain can be obtained. Simulation results are also given to demonstrate that the detection performance of weak moving target can be dramatically improved. View full abstract»

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  • F-rough law and the discovery of rough law

    Publication Year: 2009 , Page(s): 81 - 89
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2651 KB)  

    By using function one direction S-rough sets (function one direction singular rough sets), this article presents the concepts of F-Iaw, F-rough law, and the relation metric of rough law; by using these concepts, this article puts forward the theorem of F-law relation metric, two orders theorem of F-rough law relation metric, the attribute theorem of F-rough law band, the extremum theorem of F-rough law relation metric, the discovery principle of F-rough law and the application of F-rough law. View full abstract»

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  • Intuitionistic fuzzy hierarchical clustering algorithms

    Publication Year: 2009 , Page(s): 90 - 97
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2184 KB)  

    Intuitionistic fuzzy set (IFS) is a set of 2-tuple arguments, each of which is characterized by a membership degree and a nonmembership degree. The generalized form of IFS is interval-valued intuitionistic fuzzy set (IVIFS), whose components are intervals rather than exact numbers. IFSs and IVIFSs have been found to be very useful to describe vagueness and uncertainty. However, it seems that little attention has been focused on the clustering analysis of IFSs and IVIFSs. An intuitionistic fuzzy hierarchical algorithm is introduced for clustering IFSs, which is based on the traditional hierarchical clustering procedure, the intuitionistic fuzzy aggregation operator, and the basic distance measures between IFSs: the Hamming distance, normalized Hamming, weighted Hamming, the Euclidean distance, the normalized Euclidean distance, and the weighted Euclidean distance. Subsequently, the algorithm is extended for clustering IVIFSs. Finally the algorithm and its extended form are applied to the classifications of building materials and enterprises respectively. View full abstract»

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  • Method to determine α in rough set model based on connection degree

    Publication Year: 2009 , Page(s): 98 - 105
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    An improvement of tolerance relation is proposed in regard to rough set model based on connection degree by which reflexivity of relation can be assured without loss of information. Then, a method to determine optimal identity degree based on relative positive region is proposed so that the identity degree can be computed in an objective method without any preliminary or additional information about data, which is consistent with the notion of objectivity in rough set theory and data mining theory. Subsequently, an algorithm is proposed, and in two examples, the global optimum identity degree is found out. Finally, in regard to optimum connection degree, the method of rules extraction for connection degree rough set model based on generalization function is presented by which the rules extracted from a decision table are enumerated. View full abstract»

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  • Study on effectiveness evaluation of weapon systems based on grey relational analysis and TOPSIS

    Publication Year: 2009 , Page(s): 106 - 111
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1592 KB)  

    To evaluate the effectiveness of weapon systems, the advantages and disadvantages of grey relational analysis and TOPSIS for multiattribute decision-making is pointed out, and an effectiveness evaluation model of weapon systems by combining grey relational analysis and TOPSIS is proposed. The model aggregates the grey relational grade and the distance to a new integrated closeness and reflects not only the trend but also the situation of the alternative. The example illuminates that the model is effective for the effectiveness evaluation of weapon systems. View full abstract»

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  • Analysis of finite-time practical stability for time-varying polytopic topic systems

    Publication Year: 2009 , Page(s): 112 - 119
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2407 KB)  

    The problem of finite-time practical stability (FTPS) for time-varying polytopic topic systems is discussed. Three equivalent conditions for FTPS are first proposed. To facilitate the system analysis, a sufficient linear matrix inequality (LMI) criterion on the FTPS is further provided. The definition of finite-time practical boundedness and a sufficient LMI criterion are also provided to overcome the exogenous disturbance. A numerical example is used to illustrate the effect of the proposed approach. View full abstract»

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  • Observer-based passive control for descriptor systems with time-delay

    Publication Year: 2009 , Page(s): 120 - 128
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2393 KB)  

    This article is concerned with the problem of observer-based passive control for descriptor systems with time delay. Sufficient conditions are first presented for the closed loop systems to be admissible and passive with dissipation η in the case of that the time delay is known, and two kinds of methods are given to design the expected observer. Then, the case of that the time delay is unknown or uncertain is discussed. The observer-based control gains could be obtained from the solutions of linear matrix inequalities (LMIs). Simulation examples are given to show the effectiveness of the designed methods. View full abstract»

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  • Tracking controller for robot manipulators via composite nonlinear feedback law

    Publication Year: 2009 , Page(s): 129 - 135
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1843 KB)  

    A composite nonlinear feedback tracking controller for motion control of robot manipulators is described. The structure of the controller is composed of a composite nonlinear feedback law plus full robot nonlinear dynamics compensation. The stability is carried out in the presence of friction. The controller takes advantage of varying damping ratios induced by the composite nonlinear feedback control, so the transient performance of the closed-loop is remarkably improved. Simulation results demonstrate the feasibility of the proposed method. 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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Editor-in-Chief
Professor Rong Shi
Journal of Systems Engineering and Electronics