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2000 Vol.22 No.3, Published: 19 May 2000
Articles | Reviews |
 
 
Articles
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Jiang Weidong; Chen Zengping; Zhuang Zhaowen
TIME-FREQUENCY SIGNATURE EXTRACTING OF COMPLEX TARGET AND ITS RECOGNITION ALGORITHM
2000 Vol. 22 (3): 353-358 [Abstract] ( 1471 ) [PDF 1203KB] ( 502 )    DOI:

In this paper, the time-frequency characteristics of complex targets are studied and the stability of time-frequency distribution of complex target is obtained with the aspect throughout the large angle range. Based on these table signatures, recognition algorithm is proposed. The experiments of recognition using the data of three kinds of aircraft target models are performed, and demonstrate that there are high recognition performance and robust recognition algorithm.

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Liu Guoqing; Xiong Hong; Huang Shunji
AUTOMATIC MULTIRESOLUTION CLASSIFICATION OF POLARIMETRIC SAR IMAGE WITH WAVELET TRANSFORM AND MARKOV RANDOM FIELD
2000 Vol. 22 (3): 359-365 [Abstract] ( 2091 ) [PDF 1644KB] ( 555 )    DOI:

In this paper an automatic multiresolution classification method is proposed to classify polarimetric synthetic aperture radar (SAR) image.At first a textured SAR image characterizing the terrain reflection is obtained by using a multi-look polarimetric whitening filter (MPWF) to reduce the speckle in the polarimetric SAR image. Then the wavelet transform (WT) is utilized to extract texture information in different resolutions, and in the lowest resolution level the Akaik information criterion (AIC) is used for estimating the optimal number of texture classes in the image. Next the Markov random field (MRF) model is employed to characterize the spatial constraints between pixels in each resolution level, and a maximum like- lihood (ML) approach and an iterated conditional mode (ICM) approach are used for the model parameters estimation and maximum a posteriori (MAP) classification, respectively. Finally the paper presents the experimental results with the NASA/JPL L-band airborne polarimetric SAR data and verifies the effectiveness and advantage of the classification method proposed.

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Liu Qi;Sun Zhongkang
OPTIMAL LOCATION ALGORITHMS IN 3D SPACE WITH BISTATIC TWO COORDINATE RADAR
2000 Vol. 22 (3): 366-372 [Abstract] ( 1719 ) [PDF 1234KB] ( 530 )    DOI:

With the help of optimal performance of the nonlinear least square method,two optimal location algorithms(the LMF location algorithm and quasi-Newton location algorithm) are presented in this paper.Comparting to foregone location algorithms,the simulation results show that the two new location algorithms have better location performance and avoid location ambiguous question without adding new measurements.

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Huang; Yan Xu Huaping; Chen Jie; Li Chunsheng; Li Jingwen; Zhou Yinqing
AN ALGORITHM FOR INTERFEROMETRIC SAR DATA PROCESSING
2000 Vol. 22 (3): 373-378 [Abstract] ( 1681 ) [PDF 1330KB] ( 511 )    DOI:

In this paper, an algorithm of generating INSAR unwrapped phase image from SAR single-look complex images is presented. Besides the general processing technique, this article focuses on the methods of flat-earth phase removal, phase noise reduction and phase unwrapping. The availability is tested by the results of processing ERS-1/2 SAR images.

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Peng Jiangping;Ding Chibiao;Peng Hailiang
ANALYSIS OF ERROR IN RADIOMETRIC CALIBRATION FOR SPACEBORNE SAR AND CALCULATION OF IMAGING PROCESSOR GAIN
2000 Vol. 22 (3): 379-384 [Abstract] ( 2218 ) [PDF 1106KB] ( 746 )    DOI:

Various factors leading to error in spaceborne SAR radiometric calibration are discussed,and an equation to estimate the radiometric calibration error is proposed.The equation for calculating SAR imaging processor gain based on chirp scaling algorithm is derived,and testified through computer simulation experiments.A quantitative conclusion on the contribution of imaging processor gain to SAR radiometric calibration error is obtained.

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Ma Changzheng;Zhang Shouhong
THREE-DIMENSIONAL IMAGING TECHNIQUE OF SHIP TARGETS WITH MONOPULSE RADAR
2000 Vol. 22 (3): 385-391 [Abstract] ( 1603 ) [PDF 1305KB] ( 558 )    DOI:

Monopulse radar three-dimensional(3-D)images coincide with targets'size,but ISAR imaging does not hold,which is importantin precision guidance.The movement character of ship targets and the Doppler frequency induced by targets'3-D rotation are analysed,and dechirping technique to separate scatterers in coherent processing interval is proposed.For angle glint induced in angle measurement by monopulse radar,a method for processing such case is achieved.Simulation results show the high quality of monopulse 3-D images.

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Cheng Yuping;Sun Changyin
APPLICATIONS OF SUPERRESOLUTION SIGNAL ESTIMATORS TO DOPPLER BEAM SHARPENED IMAGING
2000 Vol. 22 (3): 392-397 [Abstract] ( 1908 ) [PDF 1039KB] ( 1398 )    DOI:

The Superresolution mehtod based on the models of both the signal and the noise leads tO a superior accuracy thah the FFT method.This paper presents applications of superresolution signal estimatiors to Doppler beam sharpened imaging and proposes a method for target feature extraction.Experimental results show that the imaging quality are superiorhan that of traditional FFT method.

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Wang QiaO;Wu Lenan
SAMPLING THEOREM FOR SIGNALS IN ARBITRARY PASSBAND AND DATA REPRESENTATION ADAPTED TO CHANNEL
2000 Vol. 22 (3): 398-401 [Abstract] ( 1600 ) [PDF 658KB] ( 505 )    DOI:

A sampling theorem for signals in arbitrary passband is proposed and the efficient algorithm to solve the least sampling rate is given,which can be applied to signal reprdsentation based on its channel pattern.

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Ma Bo; Qiu Zhengding
HYBRID IMAGE CODING USING ORIENTATION WAVELET SUBTREE FRACTAL QUANTIZATION AND ZEROTREE WAVELET QUANTIZATION
2000 Vol. 22 (3): 402-410 [Abstract] ( 1599 ) [PDF 2226KB] ( 940 )    DOI:

This paper first introduces the idea about orientation wavelet subtree quantization and constructs a hybrid image coding using orientation wavelet subtree fractal quantization and zerotree wavelet quantization. With this coding method the "horizontal", "vertical" and "diagonal" scaling factors of quadtrees are treated independently according to the statistic analysis of test image orientation property and a result of a marked improvement in accuracy with respect to quantization for image compression is obtained. The coding results of this hybrid coding scheme outperform conventional fractal coders and Davis’ SQS method.

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Wang SiXian;Zeng Falong
A DIFFERENCE-FILTERING WAY TO SMOOTHING IMAGE NOISE
2000 Vol. 22 (3): 411-415 [Abstract] ( 1754 ) [PDF 1215KB] ( 597 )    DOI:

Noise occurring in image generation and communication affects image quality.As a rule,median filtering or weighting smoothing is used to dwindle noise.But those ways can keep limited image details,some more value information also dwindles.This paper proposes a difference-filtering way to solve this problem.It is very important in remote sensing and medicine.

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Ma Bo;Qiu Zhengding
THE DISCUSSION ABOUT FINITE ITERATION CONVERGENCE OF FRACTAL WAVELET TRANSFORMATION
2000 Vol. 22 (3): 416-422 [Abstract] ( 1460 ) [PDF 1308KB] ( 496 )    DOI:

For the operator M which is a mean shifted version of IFS(Iterated Function System) in wavelet domain is proved that in practical circumstances the same fixed point can be reached in only few iterations. So, the IFS in wavelet domain may converge without being fully contractive. Then, a contraction factor s upper bound is obtained after relaxing the collage theorem bound and the idea of eventual contractivity introduced by Fisher is explained.

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Zhao Jianye;YH Daoheng
BLIND EQUALZATION WITH CELLULAR NEURAL NETWORK
2000 Vol. 22 (3): 423-428 [Abstract] ( 1439 ) [PDF 1150KB] ( 465 )    DOI:

In this papcr,a new approach to blind equalization based on cellular neural network (CNN)is Proposed.According to a reasonable template design method the template for blind equalization is designed.The result of computer simulation proves this approach is reasonable.

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Tao Qing;Cao Jinde;FangTingjian
THE NEURAL NETWORK MODEL FOR NONLINEAR PROGRAMMING PROBLEMS
2000 Vol. 22 (3): 429-433 [Abstract] ( 1518 ) [PDF 787KB] ( 482 )    DOI:

This paper presents a kind of neural network model for nonlinear programming problems on the closed convex sets, defines its Liapunov energy function and shows its global asymptotic stability by using La Salle invariant principle under proper assumptions. Finally, the simulations are given to illustrate the correctness of proposed model.

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Zhang Qiang; Xu Jin
GLOBAL EXPONENTIAL STABILITY OF CELLULAR NEURAL NETWORKS
2000 Vol. 22 (3): 434-438 [Abstract] ( 1366 ) [PDF 742KB] ( 511 )    DOI:

This paper studies the problem of global exponential stability for the cellular neural networks. Three criterions about global exponential stability of the cellular neural networks are obtained by means of Lyapunov function approach and the method of inequality analysis.

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Zeng Fanxin
SOME PROPERTIES ON PRIMITIVE de Bruijn SEQUENCES
2000 Vol. 22 (3): 439-443 [Abstract] ( 1982 ) [PDF 745KB] ( 519 )    DOI:

The binary primitive M-sequences are discussed in this paper. It is shown that arbitrary two reciprocal primitive M-sequences have the same auto-correlation function and the equal linear complexity, meanwhile, the configuration of the two M-sequences is proposed.

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Wang Tao; Zhou Heqin; Feng Huanqing; Jiang Chaohui
CONSTITUTING MULTIRESOLUTION WAVELET TO CHARACTERIZE QRS FREQUENCY DISTRIBUTIONS
2000 Vol. 22 (3): 444-450 [Abstract] ( 1819 ) [PDF 1201KB] ( 517 )    DOI:

A frequency limited orthogonal(FLO)wavelet with expected frequency property is constituted on the basis of Multiresolution Analysis (MRA).A parameterλis defined to characterize the frequency distribution of QRS complexes.Testing on varieties of waveforms in MIT arrhythmia database shows that ventricular ORS complexes usually yield smallerλthan that of normal QRS complexes.With such parameter,especially evaluated by the derived FLO wavelet,the stronger capability of classifying ventricular and normal beats can be oberved even in the noise contaminated ECG.

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Shen Yuehong; Qian Zuping; Li Xingguo
OPTIMAL COHERENT DETECTION OF FSK SIGNALS WITH IMBALANCE AMPLITUDES IN THE PRESENCE OF COLORED GAUSSIAN NOISE
2000 Vol. 22 (3): 451-458 [Abstract] ( 1827 ) [PDF 1378KB] ( 577 )    DOI:

The problem of optimal coherent detection of frequency-shift keying (FSK) signals transmitted over an additive colored Gaussian noise channel with imbalance gains in different frequencies(IGDF-ACGN channel) is studied. The structure of the optimal coherent detector is derived. Theoretical analysis and computer simulation results show that the detector is optimal in either additive colored Gaussian noise environment or additive white Gaussian noise environment.

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Wang Xiaohui; Zhu Yaoting; Zhu Guangxi
A SCHEME OF CONFERENCE CONNECTION SUPPORTED BY CLOS NETWORKS
2000 Vol. 22 (3): 459-463 [Abstract] ( 1405 ) [PDF 1041KB] ( 447 )    DOI:

A scheme of conference connection supported by Clos networks is presented.With the assumption in this scheme,some couples of input-output switch modules of conference network are exclusively assigned to every conference,it is proved that conference non-blocking in wide sense and conference independent routing require least middle switch modules of Clos netwotk I.E.M>-3.Furthermore.It is pointed out that this schene has characteristic of conference member non-blocking and conference independency,with advantages of flexibility,stability and low latency.

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Wang Lihong; Lu Zhaoyi; Xu Yuebin
A QUEUE MODEL OF FIBER DISTRIBUTED DATA INTERFACE
2000 Vol. 22 (3): 464-470 [Abstract] ( 1396 ) [PDF 1195KB] ( 565 )    DOI:

According to the mechanism of Fiber Distributed Data Interface (FDDI), the characters of the access method are analyzed in order to set up a queue model for FDDI. Under lighter traffic, the mathematical analysis of the model is given,and the results of emulation experiments are illustrated.

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Yao Haiying; Nie Zaiping
THE ACCURATE INTEGRATION METHOD OF SINGULARITY INTEGRATION FOR THREE DIMENSIONAL VECTOR FIELD SCATTERING
2000 Vol. 22 (3): 471-477 [Abstract] ( 1615 ) [PDF 1252KB] ( 482 )    DOI:

When three dimensional vector scattering is analyzed by integral equation and the moment method(MM)or the fast multipole method(FMM),the singular integrand will be done,If it is calculated by Gaussian integration directly,the accuracy will be very poor.In order to get an accurate result,this paper provides a method of integral domain division,which divides the integral domain into several parts with one of them containing the singularity.In the singular part,an analytic result can be derived by simplifying the integral function,replacing the variables,of adding and subtracing a sinlar term.The other can be calculated by Gaussion integration directly.Numerical results for RCS of a corner-reflector antenna and a conducting sphere calculated by this method are in reasonable agereement with that in the references.

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Wang Jiaying; Gao Benqing; Liu Ruixiang; Yang Shiming
NUMERICAL ANALYSIS METHOD FOR PLANAR NEAR-FIELD MEASUREMENT IN TIME DOMAIN
2000 Vol. 22 (3): 478-484 [Abstract] ( 1713 ) [PDF 1383KB] ( 2194 )    DOI:

The movement of antenna s near-field is studied in time domain. The near field distributions are analyzed by using plane wave-spectrum method. A sampling principle is deduced for planar near-field scanning in time domain. Some methods of near-far field transfer are introduced, which can be performed through time or frequency approach. The characteristics of the two approaches are discussed. Extensive numerical results of an H-plane waveguide horn illustrate the analysis.

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Ding Yangen
STUDY ON ELECTRON OPTICS SYSTEM OF MULTI-BEAM KLYSTRON
2000 Vol. 22 (3): 485-491 [Abstract] ( 1726 ) [PDF 1268KB] ( 489 )    DOI:

Research Work on electron optics system of multi-beam klystron has been described systematically in this paper.Design consideration and design methods for periodic reversal permanent magnet focusing system are presented ,special technical problems met in design of multi-beam electron gun with controlling electrode are discussed.2D computer software or magnetic field and electron trajectory of electron optics system has been established,and applied to calculate the electron optics system of S-band 200 kW multi-beam klystron.This multi-beam klystron has output power of 180kW,bandwidth of 7.6%,efficiency of 44.4%,gain of ggreater than 45dB,DC beam transmission of 89%.RF beam ransmission of 69~83%.There is good consistence between experiment and calculation.

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Wang Maoxiang; Wu Zonghan; Sun Chengxiu; Zhang Jigao
THE NEGATIVE RESISTANCE PHENOMENON IN THE I-V CURVE WITH DOUBLE BARRIER LIGHT EMISSION TUNNEL JUNCTIONS
2000 Vol. 22 (3): 492-495 [Abstract] ( 1600 ) [PDF 769KB] ( 460 )    DOI:

The double-barrier light emission tunnel junctions have been fabricated. The characteristics of electronic resonant tunneling with the junctions have been analyzed. In connection with the electronic resonant tunneling and light emission mechanism of the junction, the negative resistance phenomenon (NRP) in the I-V curve and the relation between NRP and Surface Plasmon Polariton(SPP) have been studied especially.

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Song Ronggong; Hu Zhengming; Yang Yixian
THE INVESTIGATION OF THE FRESHNESS IN BAN LOGIC
2000 Vol. 22 (3): 505-508 [Abstract] ( 1583 ) [PDF 793KB] ( 453 )    DOI:

Based on BAN s basic constructs and rules, the freshness in BAN logic is investigated. In this paper it is presented that some reasons why BAN logic is in practice unsound are not idealization problems, but problems what some basic rules result in. For the latter, a modified method is proposed to avoid similar problems.

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Wang Yongchuan; Li Zichen; Yang Yixian
A SECRET KEY DISTRIBUTIONS SCHEME BASED ON THE THEORY OF ALGEBRAIC SEMIGROUPS
2000 Vol. 22 (3): 509-512 [Abstract] ( 1757 ) [PDF 830KB] ( 411 )    DOI:

How to distribute a secret key information to n authorized departments(denoted as: S1, S2…Sn, respectively).For every autherized department Si(#em/em#=1, 2,…, n), there are qi authorized persons,and every authorized person has the same secret key information as that of any other authorized persons in the same authoried department.The secret key information can be reconstrueted Completely from the secret key information of any k authorized persons, if there is at least one authorized person included for every authorized department.But other cases,the secret key information cannot be reconstructed completely.In this paper,based on the algebraic semigroup theory,a secret key sharing scheme is proposed,which can satisfy the demand.

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Feng Dazheng; Bao Zheng; Shi Weixiang
BLIND BEAM-FORMING BASED ON SECOND-ORDER STATISTICS
2000 Vol. 22 (3): 513-516 [Abstract] ( 1602 ) [PDF 712KB] ( 477 )    DOI:

In order to recover the statistically imdependent source signals,the paper proposes a novel blind beam-forming approach based on two-order statistics.In this method,the source signals are extracted by the statistic properties of the zero cross-correlation between any two source signlas,under the case of unknown array manifold.The approach can be applied to the array beamforming with arbitrary array manifold and error.The method requires that the noise is white and the source signals are colored or deternuninistic,and not requires the estimation of arrival-direction of signals.In extracting source signals,it will make SNR be largest.On thecontrary to the blind beamforming besed on higher-order statistics,it is simple and robust,and can extensively be applied to the blind separation of mobile communication signals.

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Wu Wen; Li Xingguo
THE NEURAL NETWORK MODEL OF MICROSTRIP LINE
2000 Vol. 22 (3): 517-521 [Abstract] ( 1513 ) [PDF 758KB] ( 514 )    DOI:

The multi-layer perceptron is introduced to characterize the microstrip line.The size of microstrip line and the frequency are defined as the input saples of the multi-layer perceptron,and the electric characteristic parameters of the microstrip,which are obtained by the numerical method,are determined as the desired output samples.As the perceptron has been trained with the back propagation algorithm,the electric characteristic parameters of the microstrip line at any arbitrary size and frequencies can be obtained quickly from the multi-layer perceptron.

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Luo Jirun; Zhang Shichang; Ding Yaogen; Song Wenmiao
DESIGN OF A ROTATING MODE FILTER
2000 Vol. 22 (3): 522-525 [Abstract] ( 1457 ) [PDF 669KB] ( 501 )    DOI:

The solution of the electromagnetic field is given for TE mode in a infinite long fan-shaped waveguide. The basic principle of a rotating mode filter with fan-shaped waveguide is presented. The design method for the filter is discussed by a practical example. The good experimental result of the filter is reached for TE03 mode operation.

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Sha Kan; Che Wenquan; Wen Yongwu; Wen Junding
A STUDY ON THE IMPEDANCE MATCHING OF THE CIRCULAR WAVEGUIDE LATCHING FERRITE VARIABLE POLARIZER
2000 Vol. 22 (3): 526-528 [Abstract] ( 1935 ) [PDF 537KB] ( 482 )    DOI:

In this paper,the impedance matching problem of the circular waveguide latching ferrite variable polarizer has been studied,a method of calculating the impedance matching of the circular waveguide latching ferrite variable polarizer has been presented.Formulas for calculating the λ/4 impedance matching are given.According to the size obtained by the calculation,a device for impedance matching was made and the VSWR of the device has been measured.The measured results agree well with the calculated results.

Reviews
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Chen Zhe; Feng Tianjin
RESEARCH ADVANCES ON COMBINATIN OF WAVELET ANALYSIS AND NEURAL NETWORKS
2000 Vol. 22 (3): 496-504 [Abstract] ( 1689 ) [PDF 2009KB] ( 3441 )    DOI:

In recent years,the researches on combination of wavelet analysis and neural net works have attracted much attention.This paper reviews the development and status about this field.The combination of wavelet and neural networks can be categorizde into the ancillary type and the embedded type,the latter of which is referred to wavelet neural networks(WNN). WNN including its main models,algorithms and other issues are discussed.The applications and prospects of WNN are also given,which showed that WNN have great competence and po tential in the applications of function approximation,signal classification,system identification and image compression.

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