最新刊期
卷 ， 期 7 ， 1992
- 摘要：It is well known that range resolution and cross-range resolution of range-Dop-pler imaging radars are related to the effective bandwidth of transmitted signal and the angle through which the object rotates relatively to the radar line of sight during the cohe-rent processing time, respectively. In this paper we describe an investigation wherein the resolution capability of range-Doppler imaging radars is extended well beyond the limitation imposed by the conventional FFT range-Doppler processing. The approach we adopted uses linear prediction for data extrapolation before performing Fourier reconstruction. Preliminary results of rotating platform imaging based on experimental data acquired in a microwave anechoic chamber show that this technique is promissing in application to improve the resolution capability of range-Doppler imaging radars.关键词：Radar imaging;Supperresolution processing;linear prediction;Data extrapolation2|144|4更新时间：2025-12-08
- 摘要：In this paper, a new array processing method based on a new array geometry and a spatial filter is presented. The array aperture can be increased by the array geometry. To avoid spatial frequency aliasing, spatial filtering is applied to the new array geometry as preprocessing. Also the effective signal-to-noise ratio （SNR） can be raised by the spatial filtering. Simulation results have shown much better performance achieved by using the method than that obtained by using previous methods.关键词：radar;signal processing;array processing;Superresolution array processing;Superresolution spectrum estimation2|43|1更新时间：2025-12-08
- 摘要：In this paper the new concept of generalized morphological skeleton of set and percentile morphological spectrum of image have been proposed. Their meaning, properties and effects for morphological representation, reconstruction and filtering of image and feature extraction of pattern have been investigated and discussed.关键词：Morphological skeleton;Morphological spectrum decomposition;Percentile morphological spectrum2|35|1更新时间：2025-12-08
- 摘要：The lead system for multi-channel FECG processing by using Singular Value Decomposition （SVD） method is studied. The performances of several lead systems are compared. We analyze the principies for designing lead system on the basis of oriented energy theory, then we present a new lead system, two indexs, i. e. oriented signal-to-signal ratio and oriented signal-to-noise ratio, for evaluating the lead system, and the judgement technique of singular value spectra for dividing the subspaces of resources. Finally, the satisfactory results of clini-cal experiments are shown.关键词：SVD;Leadsytem;Multi-Channel FEGG;Lead system evaluation indexes;Singular value spectra judgement2|70|1更新时间：2025-12-08
- 摘要：This paper proposes and discusses a blind equalization algorithm for multile-vel digital communication systems. The research results show that it possesses the reliable convergence and the performance is satisfactory after the convergence.关键词：数字通信;符号串扰;盲均衡;算法2|104|7更新时间：2025-12-08
- 摘要：In this paper we solve the following classical problem of Harmonie Analysis on Abelian Groups. Which are the necessary and sufficient conditions that should be satisfied by an ordered set of complex numbers in order to be the Fourier-（Chrestenson）-Spectrum of a function, f: Gnf33D where D may denote , or G? We obtain as corollaries to the main theorems some known results for G = 2关键词：Abelian group;Fourier spectrum;Boolean function;Calculation complexity2|34|4更新时间：2025-12-08
- 摘要：In this paper, upper bounds on the length of linear unequal error protection codes are derived. These new upper bounds are better than results of [1] in many cases. Application of new upper bounds in constructing linear unequal error protection codes is also discussed.关键词：linear code;hamming distance2|21|0更新时间：2025-12-08
- 摘要：A flexible structure of convolutional encoder is proposed for implementing trellis coded modulation （TOM）. Best codes are searched in accordance with different cons-traint rules on signal assignment. Results show that for Gaussian channels, when the number of trellis state is small, Ungerboeck’s rule is the necessary condition for obtaining the optimal codes, when the number increases, different rules may exist for achieving the best performance.关键词：Trellis coded modulation;Convolutional encoder2|77|3更新时间：2025-12-08
- 摘要：In this paper a method of continuous speech recognition based on hidden Markov models （HMM） and vector quantization （VQ） is discussed. According to the method, forming its own HMM for each word’s voice, searching the optimal path of state transition network combined by HMM’ s of all words of the vocabulary, it has been realized to recog-nize continuous spoken sentences without presegmentation of each word. The recognition performance is improved by using finite-state syntactic analysis and other techniques. The de-monstration system with vocabulary of 150 words can process 18 type of English sentences. The delay from speech end to getting recognition result is nearly 0.62 times as long as the duration of speech. Tested by 312 sentences including 2710 words, the word recognition accuracy is 97.3% when the average speech speed is 2.32 words per second.关键词：continuous speech recognition;hidden Markov model;Syntactic analysis2|116|1更新时间：2025-12-08
- 摘要：This paper describes a Markov random field （MRF） model for line elements, whose states are given by orientations and spatial interactions of line elements. Its reconstruc-tion is based on learning procedures and multiplevalued Boltzmann machines. Experimental results are reported to demonstrate the effectiveness of the algorithm.关键词：Markov random field;Neural networks;parameter estimation;Image recons-truction2|52|1更新时间：2025-12-08
- 摘要：This paper introduces the construction of algorithm for computing DFT（pn;k）. The construction of algorithm contains two steps: first, to permute the transform matrix of DFT（pn; k） into a block-structured matrix which contains circulant matrices by use of the partition of local ring; second, to decompose the circulant matrices into a series of CFT（p3）, the core of DFT（p3）, s = 1,2,…… n. We also give the multiplicative complexity of the algorithm and prove that the algorithm is one with the minimum number of multiplications when n=1, k≠1, or n≠1, k=1.关键词：digital signal processing;DFT;Local ring;algorithm2|17|1更新时间：2025-12-08
- 摘要：3-D computer vision involves range-data acquisition, 3-D feature detection, object modeling and matching problems. This paper reviews some advances on the research of 3-D computer vision in these aspects. Comments are given for further research efforts.关键词：computer vision;machine vision;Object recognition3|131|4更新时间：2025-12-08
- 摘要：The basic concepts of current-mode approach and main building blocks of cur-rent-mode IC are introduced in the paper. The motivation and recent advances of the research are reviewed, and the open problems of current-mode signal precessing researches are reviewed too.关键词：signal processing;IC;current-mode2|193|16更新时间：2025-12-08
- 摘要：In this paper, the method of tests for linearity and Gaussianity of stationary time series via higher order spectra is given. This method is also proved by the practical experiments.关键词：Higher order spectra;Stationary time series;Tests for linearity and gaussianity2|230|1更新时间：2025-12-08
- 摘要：According to the principles of determinant resolution, this paper presents a （K, N） TCSS system and analyses the performance, the advantage and the shortage of the system. It points that by using the system we not only can get the performance demanded by （K, N） TCSS system, but also can identity the legality of the persons who grasp the sub-cryptographic key, thus we can protect the main key from being changed and destroyed.关键词：Communication secret key;Distributive management;Polynomial of kth degree2|12|1更新时间：2025-12-08
- 摘要：Square root computation convenlionallly required in Givens transformation may be replaced by a series of addition and shift or exponent operations 50 as to improve computation efficiency, particu-larly for VLSI implementation in systolic array architecture. On the basis of analysis of Givens transfor-mation in solving least squares problem, the square root free algorithm is described and analyzed.关键词：Orthognal transform;Triangularization;Girens transformation;algorithm2|65|0更新时间：2025-12-08
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