最新刊期
卷 ， 期 4 ， 1996
- 摘要：Detection of objects in images is often needed in pattern recognition and machine vision.In this paper,the Hausdorff distance is used to measure the degree of similarity between two objects,and a genetic algorithm is utilized to search interested objects.The experimental results show that the proposed method can efficiently detect the objects in images regardless of their changes in translation,rotation and scale.关键词：Hausdorff distance;matching;genetic algorithm2|459|67更新时间：2025-12-08
- 摘要：Based on voltage to frequency（V/F） conversion a method for digital phase sensitive detection（DPSD） is proposed in this paper,by which a vector analysis of detected signals can be achieved.The detection performance of the proposed method,under AWGN and harmonics,is analyzed and computer simulation results are given for comparision between the well-known inphase/quadrature sampling method and the one described here.An architecture of microprocessor based implementation of the proposed method is also presented.关键词：Digital phase sensitive detection;Noise suppression;Harmonic suppression;Signal detection2|136|10更新时间：2025-12-08
- 摘要：Principal Component Analysis（PCA） and Minor Component Analysis（MCA） are essential techniques in signal processing such as feature extraction,data compression,frequency estimation and curve fitting.Recently,there has been much interest in the connection between PCA,MCA and neural networks.It is a difficult problem in PCA and MCA when eigenvalues of covariance matrix R are not distinct.A new learning algorithm that the weight vectors will converge to orthonormal eigenvectors is proposed in this paper to solve the problem.关键词：neural networks;Principal component analysis（PCA）;Minor component analysis（MCA）;learning algorithm;Eigenvectors2|219|13更新时间：2025-12-08
- 摘要：A procedure of detecting man-made objects in natural background from a visible image is presented,in which the fractals with self-similarity property is employed to model natural background,and the intrinsic difference in fractal characters between man-made objects and natural background is used to identify man-made objects.The methods of adaptive enhancement for fractal features and composite image segmentation are also discussed.Some experimental results for real images show that the procedure in this paper is applicable.关键词：分形;分维;目标检测;图像分割2|274|40更新时间：2025-12-08
- 摘要：Maximum number of memories which can be stored in a binary Hopfield type neural network with N neurons is 2N.A necessary and sufficient condition for arbitrary K （1≤K≤2N）N-dimensional binary vectors to be stable states of the network is given.A binary Hopfield type neural network may have no any stable states,which is an important distinction with continuoustime Hopfield type neural network.Some conclusions are also given.关键词：Binary Hopfied type neural network;Memoried patterns;Stable states2|77|5更新时间：2025-12-08
- 摘要：This paper deals with the problem of identification of a noncausal nonminimum phase system in a colored Gaussian noise.A three-step method is proposed for the identification.Simulation examples are presented to illustrate its high resolution.关键词：Noncausal system;ARMA modelling;Higher-order cumulant;SVD-TLS algorithm2|156|11更新时间：2025-12-08
- 摘要：Fractionally differenced Gaussian noise（fdGn） process is a discrete time equivalent of fractional Brownian motion.Filtered versions of such processes are ideally suited for modeling signals with different short-term and long-term correlation characteristics.In this paper,we study the structure identification of filtered fdGn processes.For signals that exhibit a weak or moderate long-term persistence,an OIVPM-MDL structure identification method is proposed based on overdetermined instrumental variable product moment（OIVPM） and minimum description length（MDL） criteria,and for signals with a strong long-term correlation between samples a combinative approach of inverse fractional filtering and the OIVPM-MDL method is also described.Examples are given to illustrate the feasibility and effectiveness of the proposed method.关键词：fractional Brownian motion;Fractionally differenced Gaussian noise process;instrumental variable;Minimum description length criterion;Structure identification2|89|3更新时间：2025-12-08
- 摘要：The synthetic aperture radar（SAR） imaging system is portrayed as a multiple access information system and an information theory approach is applied to the SAR imaging system.The information content about a point target that can be extracted from its radar images is evaluated by the average mutual information and the average mutual intormation is also used to define a measure of radiometric resolution for radar images.A translative probability density function of the SAR imaging system is derived by analysing the system and a closed form of the information content is found.Some conclusions are obtained.The results presented provide a theoretical interpretion and an explanation for some well-known results in the field of SAR.关键词：合成孔径雷达（SAR）;信息论;雷达图象分析;传递概率密度函数;平均互信息;幅射分辨率2|172|2更新时间：2025-12-08
- 摘要：The fusion technology of neural network and fuzzy reason has been successfully and widely used in the signal procesing and controling of nonlinear systems in recent years.This paper presents a parallel topology structure of fusion based on the new concepts of robust neural network and mixed fuzzy reason.The fusion system faces not only non-Gaussian noise but also fuzzy signal.Experimental results are provided to indicate the performance of this fusion method in the tracking system of high frequency surface wave radar.关键词：neural network;Fuzzy reason;fusion;target tracking2|54|3更新时间：2025-12-08
- 摘要：A new approach,based on the principle of the ESP（Equivalent Small Parameter）method,is presented for calculation of oscillations in higher-order nonlinear parametric excitation systems.The formulation and example have shown that higher-order harmonics and corrections of first harmonic are easy to obtain.The method is applicable to high-order nonlinear parametric systems and has the advantage of the symbolic analysis.关键词：nonlinear systems;Parametric systems;Sub-harmonic oscillation;Parametric excitation2|59|0更新时间：2025-12-08
- 摘要：The information-combination mapping is mainly investigated based on a parallel combinatory DS/SS communication system.It’s shown that the effect of this mapping on the system is not negligible and.an easily operated method called"graph matching″to get the suboptimal mapping is presented.Computer simulation results demonstrate that it’s important to optimize the mapping,and the mapping determined with the proposed method is good enough.By a comparison of several DS/SS communication schemes,it can be found that this parallel combinatory DS/SS communication system has higher efficiency and lower complexity relatively.关键词：Parallel combinatory DS/SS;Extending constant weight code（ECWC）;correlation;Information-combinaton mapping2|91|21更新时间：2025-12-08
- 摘要：One of the important means to improve the performance of spread spectrum communication system is to combine error-correcting with spread-spectrum.In this paper,we discuss the advantages of applying TCM to the orthogonal code spread spectrum systems,which increase the minimum free Euclidean distance between the transmitted sequences by expanding and partitioning of the signal sets.Analysis and computer simulation show that the performance of the system in the channel with additive white Gaussian noise and multiple-access interference is markedly improved.关键词：Spread-spectrum communications;Trellis coded modulation;Multiple-access interference2|87|4更新时间：2025-12-08
- 摘要：This paper proposes an algorithm for extracting the pose and velocity of the moving objects and the 3-D location of interest points in the external environments,based on the image plane trajectories of salient points over the image sequence.These trajectories are related to the parameters to be estimated using motion model and imaging model,making it possible to incorporate the information contained in long image sequences and to estimate unknown motion and structure parameters using an IEKF.关键词：视觉运动分析;长序列图象;运动参数估计;特征点轨迹;绝对姿态2|87|4更新时间：2025-12-08
- 摘要：In this paper a simple passive nonlinear delay locked protection circuit is proposed.It posseses all the functions of counter delay locked protection circuit which consists of complex digital logical circuit.Besides,in some cases it’s better than the latter such as in circumstance using rc-lowpass circuit to replace the integrate-dump circuit.The performance of passive nonlinear delay locked protection circuit is analyzed. The mean and variance of locked hold time are given under the conditions of both ideal integration and rc-lowpass circuit correlation processing.关键词：Delay locked protection;spread spectrum communication2|41|11更新时间：2025-12-08
- 摘要：This paper presents a class of trap-door one-way mappings on a semigroup.Based on this class of trap-door one-way mappings,we can establish public key cryptosystem by chooseing a proper semigroup.关键词：Trap-door one-way mapping;Cryptosystem;Semigroup2|45|0更新时间：2025-12-08
- 摘要：This paper discusses some problems in the development strategy for communication counter-countermeasures by consensus,creation,cooperation and information,and offers some ideas and proposals.关键词：通信反对抗、反侦察、抗干扰2|196|12更新时间：2025-12-08
- 摘要：This paper takes a triple distillation column as the object and introduces the design of neural network control system（NNCS） in distillation process.The NNCS introduces NN preestimater and NN controller.The NN preestimater is used to express the nonlinear relation between the input and the output.The NN controller is used to realize the decouple control on NN preestimater.BP network is used and realized on a parallel system of 9 Transputers.关键词：neural network;BP network;intelligent control;Distillation column2|127|8更新时间：2025-12-08
- 摘要：Based on in-depth analysis of knowledge storing mode of neural networks,the inadequacy of current storing mode is pinpointed.That is to say,despite its definite intelligent processing capability.the neural neiwork made up of large numbers of neurons with simple processing capability but without complicated processing capability is bound to have such drawbacks as local minimum,slow converging rate and insufficient capability of being popularized.In particular,it can hardly be applied to real-time processing systenis,which greatly limits its range of application.To remedy such a situation,a new intelligent neuron model is proposed and compared with neuron models in common use.It is pointed out in a subsequent paper entitled "Generalized Information Storing Principle and Higher-Order Generalized Neural Networks" that the algorithm based on the intelligent neuron model can raise the converging rate of the conventional BP algorithm more than 1,000 times.关键词：neural networks;learning algorithm;network model;BP algorithm2|256|19更新时间：2025-12-08
- 摘要：Followed analying for the property of a class of cyclic codes.An algorithm for neural soft decision decoding of these codes is presented.The coniplexity of new algorithm is much less than that of available algorithms for decoding of general linear block codes,and its performance is approached to that of the maximum likelihood decoding.关键词：cyclic codes;soft-decision decoding;neural networks2|64|2更新时间：2025-12-08
- 摘要：This paper discusses nonlinearity of Boolean functions that are constructed in Ref.[1] by using Walsh spectrum,and proves that balanced Boolean functions Satisfying 2k-1 degree propagation criteria over don’t exist.关键词：非线性度;扩散特性;谱1|113|6更新时间：2025-12-08
- 摘要：Error performance of 6PSK ring codes over Rayleigh fading channel is discussed following the work of[10].Exponent of average error probability is derived based on the weight sets of component codes.The performance of ring codes is compared with that of coset codes.It is shown that the error performance of ring codes is better than that of equivalent coset codes constructed by any other methods.关键词：coded modulation;Ring Code;Rayleigh fading2|52|0更新时间：2025-12-08
- 摘要：A new modem technique for HF communication network with dynamic data rates is first given in the paper.Then a distributed self-organizing algorithm for the network is proposed.Finally its prototype system and performance are presented.关键词：HF communication;Modem;Self-organizing network2|96|14更新时间：2025-12-08
- 摘要：An efficient decoding algorithm for geometrically generalized RS codes is presented,which can be applied to decode any received codes with errors not more than[（d-1）/2].The decoding complexity is only O （n3）.关键词：Geometrically generalized RS codes;decoding;Complexity.2|48|0更新时间：2025-12-08
- 摘要：The detection of the quadratic phase coupling has been widely applied in various field such as EEG data analysis,oceanography,sonar and medical biology.In this paper,instead of using the bispectrum to detect the quadratic phase coupling,a new method based on -dimension spectrum is developed.Simulation results show that this methodis much simpler and costs little computer time as well as has high resolution ability.It is sure that this method has much application value.关键词：Quadratic phase coUpling;-dimension spectrum;Bispectrum.2|287|68更新时间：2025-12-08
- 摘要：The arrival time of electromagnetic back scattered wave is precisely detected by using the multiresolution analysis.And the effects of white noise and time jittered noise on the sample of the received signal are removed.The results show the methoed is valid.关键词：wavelet transform;Detecting arrival time;denoising3|130|80更新时间：2025-12-08
- 摘要：Lateral inhibition described by Bubble function is a very common mechanism in living creature vision information processing system.In this paper,we use Bubble function as wavelet base and Gaussian function as smooth function to decompose signal using Mallat algorithm and the position of maximum decomposition value is just the position of edges.This algorithm has different ability to reduce noise and to extract edges according to different scales of Bubble function.When the scale of Bubble function is growing wide,then the ability of reducing noise increases and the ability of extracting detail edges decreases;otherwise,the ability of reducing noise decreases and the ability of extracting detail edge increases. Both the theory and experiment manifest that this algorithm is very efficient and practical.关键词：wavelet;Lateral inhibition;Detection edge;Bubble function2|248|63更新时间：2025-12-08
- 摘要：This paper introduces an estimating method for contour-based optical flow field in ultrasound B-scan images.It is a matching algorithm of boundary cluster centers.The paper also shows the experimental result that optical flow field of heart constructions is detected by this algorithm.关键词：Deformed bodies;Contour-based optical flow field;B-mode ultrasound images2|62|13更新时间：2025-12-08
- 摘要：Ｚｐ上的正交组的判定和构造冯登国，肖国镇（西安电子科技大学密码所，西安７１００７１）ＦｅｎｇＤｅｎｇｇｕｏａｎｄＸｉａｏＧｕｏｚｈｅｎ（ＸｉｄｉａｎＵｎｉｖｅｒｓｉｔｙ，Ｘｉ′ａｎ７１００７１）正交组在分组密码的研究中越来越受到人们的重视，正交组的?..2|43|0更新时间：2025-12-08
- 摘要：一类Ｍ序列自相关函数的界ＢｏｕｎｄｓｏｆＡｕｔｏｃｏｒｒｅｌａｔｉｏｎＦｕｎｃｔｉｏｎｓｏｎＡＦａｍｉｌｙｏｆＭ－Ｓｅｑｕｅｎｃｅ￥／／曾凡鑫（重庆通信学院电子线路教研室，重庆６３００３５）二元Ｍ序列的研究主要包括Ｍ序列的构造法［１～３］和Ｍ序列相关...2|82|5更新时间：2025-12-08
- 摘要：北京航空航天大学电子工程系Ｄｅｐｔ．ＯｆＥｌｅｃｔｒｏｎｉｃＥｎｇｉｎｅｅｒｉｎｇ，ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＡｅｒｏｎａｕｔｉｃｓａｎｄＡｓｔｒｏｎａｕｔｉｃｓ￥／／北京航空航天大学电子工程系成立于１９５８年，它是我国建立最早的从事航空...3|26|0更新时间：2025-12-08
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