最新刊期
卷 42 ， 期 3 ， 2014
- 摘要：Due to the non-stability and non-linearity characteristic of missile equipment spare parts demand,the thought of wavelet analysis theory used on missile equipment spare parts demand forecasting.The best grading of its decomposition of wavelet was determined in terms of the collective evaluation index,and spare parts demand time series were decomposed into different scales in order to reduce the randomicity and volatility of original time series;The high frequency signals were forecasted with ARMA model optimized by the improved self-adaptive intergeneration projection genetic algorithm and damping least-squares method,and the low frequency was forecasted with GM(1,1) model;the respective forecast result were integrated to get the forecast value of the original time series.Through an experiment of missile equipment spare parts demand,the feasibility and effectiveness of this method was proven.关键词：spare parts;demand forecasting;wavelet analysis;grey model;ARMA(Atuo-Regressive Moving Average)model2|2|5更新时间：2025-07-16
- 摘要：The channel mismatch is often inevitable for the actual multi-channel synthetic aperture radar/ground moving target indication (SAR/GMTI) system.Consequently,to enhance GMTI performance,the channel mismatch must be effectively calibrated.A robust channel blind equalization algorithm is investigated.This proposed algorithm is on the basis of the classical channel blind equalization algorithm with eigen-decomposition of data covariance matrix,and combines reduced-dimension processing and median estimate.Experimental results on measured SAR data demonstrate that compared with the conventional algorithm,this proposed algorithm not only shows a faster convergence rate but also exhibits convergence-robustness to targets in the training sample data.关键词：ground moving target detection (GMTI);channel blind equalization;reduced-dimension processing;median estimate2|2|2更新时间：2025-07-16
- 摘要：The detection of far-field weak target is influenced by the strong near-field platform radiated noise interference in the towed line array sonar.The near-field sound is with multiple channel propagation,and the far-field sound is with plane wave propagation.By these propagation characteristics,the matched field processing technology and the direction of arrival estimation technology are combined together.The spatial matrix filters are designed by the near-filed platform noise copy vector and the far-field plane wave bearing vector.Two optimization programs are built to achieve different platform noise suppression effects.The optimal solutions are deduced directly and their relationships are established.In the bearing course,the strong interferences exist without filtering,and the blind areas exist after filtering by the spatial matrix filter.The reason is that there are relativities between the platform copy vector and the plane wave bearing vector.Simulations indicate that it can achieve less blind area and higher detection capability with spatial matrix filter processing.关键词：platform radiated noise;spatial matrix filter;matrix filter;matched field processing;beamforming;interference suppression;noise cancellation;towed line array sonar2|3|7更新时间：2025-07-16
- 摘要：Target indicated angle of radar seeker biases off the target when the centroid jamming such as chaff cloud or corner reflector presents,which makes the missile miss the target.To address this problem,oblique projection is employed to suppress the centroid jamming in this paper,where oblique projection operator is constructed by utilizing the polarization parameters of the target and the jamming.Since the polarization parameters of the target and the jamming are difficult to be estimated accurately in reality,influences of the estimation errors of the polarization parameters of the target and the jamming on the output target signal and jamming after oblique projection are mainly analyzed.Analytic expressions of output signal errors of the target and the jamming are presented.Based on this,the output interference-to-signal ratio and angle measurement error after oblique projection are further derived.Theoretical derivation and simulation results both demonstrate that angle measurement error of radar seeker after oblique projection is unrelated to the estimation error of the polarization parameters of the target,and is related to the estimation error of the polarization parameters for the jamming.Oblique projection can suppress the jamming to some extent and is good for enhancing the angle measurement accuracy of radar seeker if the estimation errors of the polarization parameters of the jamming are within the range of minus ten degree to ten degree.关键词：radar seeker;anti-jamming;centroid jamming;oblique projection;polarization2|2|3更新时间：2025-07-16
- 摘要：The direct allocation method for modern tactical aircraft is too complicated to meet the real-time requirements.This paper gives the concept of hypo-attainable moment set (HAMS) and then proposes a new direct control allocation scheme based on HAMS to solving the difficulty of direct allocation method.We prove that the new method in HAMS can get the same result as the direct control allocation method in attainable moment set.But the computational complexity is reduced greatly.Simulation shows that the searching speed is increased by 60%,this verifies the effectiveness of the new method.In addition,this method can also be used for other multi-variable control allocation problem.关键词：flight control;multi-controls;control allocation;AMS(Attainable Moment Set)2|3|1更新时间：2025-07-16
- 摘要：Motion compensation is a key procedure in ISAR (Inverse Synthetic Aperture Radar)imaging.The motion compensation can be viewed as a multi-parameter estimation problem.Based on the designing structured Gram matrices optimization,a motion compensation method is put forward.This method consists of two parts:the range alignment algorithm and the phase compensation algorithm.The former estimates the offset of each range profile based on a criterion,which makes correlations among all range profiles approaching to maximum values simultaneously.And the latter can extract phase errors by means of the optimization method,in which the optimal matrix is derived from analysis on the signal model.The measured data processing result shows that the motion compensation method has strong robustness and high estimation accuracy.关键词：ISAR(Inverse Synthetic Aperture Radar);structured Gram matrices;range alignment;phase compensation;compressed sensing4|2|2更新时间：2025-07-16
- 摘要：One-stationary bistatic low frequency ultra wide band synthetic aperture radar (UWB SAR) has the azimuth-variant range cell migration and longer synthetic aperture,which greatly complicates the range-azimuth coupling and limits the application of frequency-domain algorithms.In this paper,a fast factorized back projection (FFBP) algorithm based on elliptical polar coordinate is presented to focus the one-stationary bistatic low frequency UWB SAR data.Based on the imaging geometry,the analytical expressions of the back projection (BP) algorithm in Cartesian coordinate and elliptical polar coordinate systems are derived,respectively.The advantage of implementing the bistatic FFBP algorithm in elliptical polar coordinate is analyzed.Then,the sampling requirements for subimages are deduced from the bandwidth and bistatic range error angles,respectively.Finally,the implementation and the computational burden of this algorithm are discussed.Simulation results prove the validity of the proposed approach.关键词：one-stationary bistatic synthetic aperture radar;elliptical polar coordinate;low frequency;ultra wide band;fast factorized back projection2|2|0更新时间：2025-07-16
- 摘要：Aiming at improving the performance of targets detection and range-Doppler parameters estimation for compressive sensing radar (CSR) amid interference and noise,a CSR joint optimal waveform design method is proposed to minimize the averaged coherence of the sensing matrix (ACSM) and the signal to interference and noise ratio (SINR) simultaneously.First,a CSR two-dimensional sensing model for range-Doppler estimation is established and a waveform joint optimization object function is derived.Then,the simulated annealing (SA) algorithm is employed to obtain the optimal solution,where the poly phase coded signal is taken into account.Compared with the traditional CSR waveforms,the optimized waveform enhances the CSR successful detection probability in the low SINR conditions,and also effectively reduces the target range-Doppler parameter estimation error,thereby improving the CSR range-Doppler imaging quality.Simulation results show the effectiveness of the proposed method.关键词：compressive sensing radar (CSR);waveform optimization;averaged coherence of the sensing matrix (ACSM);signal to interference and noise ratio (SINR);simulated snnealing (SA)2|2|2更新时间：2025-07-16
- 摘要：We proposed two methods to reduce the bias of the well-known algebraic closed-form solution for source localization proposed by Ho using both TDOA(Time Difference of Arrival) and GROA(Gain Ratio of Arrival).The paper starts by deriving the bias of the source location estimate from Ho's solution.Two methods,called BiasSub and BiasRed,are developed to reduce the bias.The BiasSub method directly subtracts the expected bias from the solution of Ho.The BiasRed method augments the equation error formulation and imposes a constraint to improve the source location estimate.Analysis shows that both methods reduce the bias considerably for distant source when the noise is Gaussian and small.The BiasRed method is able to lower the bias to the same level as the maximum likelihood estimator.Simulations corroborate the performance of the proposed methods.关键词：source localization;time difference of arrival (TDOA);gain ratio of arrival (GROA);bias reduction2|2|0更新时间：2025-07-16
- 摘要：Alternating direction exterior point continuation method (ADEPCM) is proposed to solve the l1-regularization problem,which is the classic problem of signal compression and reconstruction for compressed sensing (CS).The first step of ADEPCM is to express the l1-regularization problem of the sparse coefficient in the transform domain as an equivalent constrained optimization problem by using variable splitting (VS) technology.Then,by introducing the penalty function,the two variables are alternatively minimized by Gauss-Seidel method,and the penalty variable is updated by a continuation scheme,and then the sparse coefficient in the transform domain is reconstructed.Finally,the original signal is reconstructed by the orthogonal inverse transform.And the experimental simulations demonstrate that the ADEPCM algorithm yields a slightly higher peak signal to noise ratio (PSNR) reconstructed image as well as a much faster convergence rate as compared to some existing reconstruction algorithms.关键词：alternating direction exterior point continuation method;exterior point method;signal reconstruction;compressed sensing3|2|0更新时间：2025-07-16
- 摘要：The airspeed estimate problem in case of missing data is researched in this paper.According to the propagation principle of acoustic wave in air current,the output model of an acoustic vector array is given.Two airspeed estimate algorithms are proposed based on the difference of output signal in amplitude of each sensor,and a method compensating random perturbation is given.In case of missing array's output data,a new method for reconstructing correlation matrix of output data is proposed.Using this method,the effect of missing data on the performance of airspeed estimate algorithms can be reduced.Thus,the airspeed estimate algorithms are still valid in case that some sensors fail.Simulation results show two airspeed estimate algorithms have better performance in the presence of random perturbation.By reconstructing correlation matrix of output data,two airspeed estimate algorithms can hold better performance in case of missing data.关键词：array signal processing;airspeed estimation;data missing;acoustic vector sensor2|3|5更新时间：2025-07-16
- 摘要：This paper proposed a 3D model feature lines extracting method guided by user's sketch.There are two main contributions of our method:on the one hand,a conditional random fields(CRF)-matching model with geometric features and shape similarity between stroke points and candidate feature points is established,and the user drawing purpose is combined with the model feature lines extraction effectively;on the other hand,a topological similarity based metrics is proposed to evaluate the rationality of extracted feature lines,and an iterative optimization process is applied to obtain global optimized model feature lines.The experimental results show that our method is efficient to extract reasonable 3D model feature lines which are similar to sketch strokes on shape and topological properties.关键词：non-photorealistic rendering;feature lines extraction;conditional random fields;iterative optimization;guided sketch2|2|0更新时间：2025-07-16
- 摘要：The residual sum of squares of implicit polynomial (IP) and its gradients are constructed as objective function that can be minimized to obtain the fitted IP curve for representing a given shape.However,how to balance the two residual sum of squares using a weight factor is a difficult problem.The adaptive weight algorithm was proposed to determine the weight factor.Firstly,the function formula for the coefficient vector norm of IP curve and the weight were constructed according to the stability of IP curve.Secondly,the minimizer of the the function was computed,and used as the weight.Lastly,the IP curve can be obtained by minimizing the objective function with weight.The performance of the proposed method was evaluated on the standard MPEG-7 shape database,and the experimental results show that the IP curve obtained by proposed algorithm can represent the object shapes both accurately and stably.关键词：implicit polynomial curve;shape description;adaptive weight2|2|0更新时间：2025-07-16
- 摘要：To improve the multi-sensor fusion performance of vessel dynamic positioning,a closed-loop hierarchical fusion algorithm is proposed.The presented fusion algorithm has local and global estimators.The Kalman filter is used in both the local and global estimates.The global fusion is fed back to the local filters.Mapping relationships between the local and global estimates are defined by environment conditions derived from each local estimator.Adjusting factors based on the local and global estimates covariances are introduced.The gain of the global fusion is adjusted optimally according to the mapping matrices and adjusting factors.The global estimate is included in local estimates.The proposed algorithm combines the local and global estimates into one closed-loop mutual compensation system.By the vessel semi-physical simulation system the validities of the proposed algorithm are verified.关键词：multi-sensor fusion;state estimate;hierarchical fusion;Kalman filter4|2|1更新时间：2025-07-16
- 摘要：According to a novel 6-DOF moving platform of orthogonal parallel mechanism,a control algorithm,which is aimed at the robustness of the closed loop system,is proposed to apply to that moving platform of PSS 3-2-1 orthogonal parallel mechanism.The platform can keep up with an independent dynamic equilibrium when it suffers the interference in a certain degree,and this algorithm is focused on being in real time.With the mentioned algorithm we tried to track and controll the track of the moving platform,the simulation experimental results certify that the presented algorithm has good inhibitory effect on the impact of inaccurate model and the external interference of this moving platform,and it has much more responsive and better robustness on tracking the track of PSS 3-2-1 moving platform of orthogonal parallel mechanism.关键词：orthogonal parallel mechanism;dynamics model;stability;robust control;trajectory tracking2|2|0更新时间：2025-07-16
- 摘要：Space-time adaptive processing is an effective method to detect ground moving targets embedded in clutter environment,and the estimation of clutter covariance matrix with training samples is required to perform the adaptive processing commonly.In realistic environment,the characteristics of clutter in the cell under test may be different with the training samples in other range cells,which would reduce the precision of the estimated clutter covariance matrix.To improve the performance of target detection,a training sample selecting method based on polarized classification and power grouping is proposed in this paper,which would improve the precision of the clutter covariance matrix.The simulation results demonstrate the effectiveness of the proposed method.关键词：ground moving target indication;clutter rejection;polarized signal processing2|2|6更新时间：2025-07-16
- 摘要：Running software often faces serious threats,for example,the core algorithm is reversed or confidential information is leaked.So,it is needed to study effective protection methods against dynamic attack.The paper includes two aspects.First,do in-depth analysis and comprehensive comparison of the existing method of software protection against dynamic attacks.According to four mainstream software protection methods against anti-dynamic attack,we do comprehensive comparison of these four protection methods from three indicators of implementation difficulty,performance impact and security.Second,Introduce the work of our two studies in software protection against anti-dynamic attacks through examples.They are a software protection method based on dynamic deformation engine and a security-enhanced software protection based on virtual machine.关键词：white-box attack environment;anti-dynamic attack;software protection;virtual machine based software protection2|2|5更新时间：2025-07-16
- 摘要：Ground vehicles are the important civil and military targets.The research on vehicle recognition has great application values to the intelligent transportation management,national defense and security.The research status at home and abroad and the application background of vehicle recognition were summarized firstly,then the existent detection means,signature extraction and recognition techniques were listed and summarized.The development prospect of vehicle recognition was also analyzed,which may offer some constructive reference to the research on ground vehicle classification and recognition.关键词：ground vehicles;target recognition;review2|2|17更新时间：2025-07-16
- 摘要：Some of the sample observations,which seem like time series or discrete signals,are in fact smooth curves (functional data) corresponding to a latent continuous process.The smooth principal component analysis (PCA) focusing on functional data variation can fully characterize the dynamic features hidden in observations.The approaches smoothing discrete samples to continuous curves were introduced.The linear framework of smooth PCA was described as multivariate statistics in basis function spaces.The amplitude variation and phase variation embedded in smooth curves needed registration operations to separate themselves.The nonlinear framework of smooth PCA was discussed in two aspects:depicting two types of variation together with mixed data;depicting phase variation separately with differential manifolds in non-Euclidean space.Three groups of smooth PCA results were presented,which are raw gait data without registration,gait amplitude variation with registration and phase variation.Finally,the applications of smooth PCA in bio-signal processing were reviewed.关键词：principal component analysis;smooth;functional data;phase variation2|3|0更新时间：2025-07-16
- 摘要：Transfer learning algorithms usually focus on reusing data of related domains to help solving the learning tasks in the target domain.However,these methods ignore the ability of mutual learning between domains.In this paper,a collaborative constraint based symbiosis transfer learning method (CCSTL) is proposed.Symbiotic transfer mechanism is used to implement mutual learning among domains along with the collaborative constraint.With the help of the iterative optimizations,the proposed method can realize knowledge transfer between the source and target domains.Experimental results on synthetic and real world datasets show the superior or comparable performance of the proposed algorithm compared with existing algorithms.关键词：collaborative constraints;symbiosis transfer learning;classification;support vector machine2|2|2更新时间：2025-07-16
- 摘要：Particle swarm optimization algorithm (PSO) and estimation of distribution algorithm (EDA) are seldom applied to permutation-based combinatorial optimization problems.This paper presents an estimation of distribution-discrete particle swarm optimization algorithm (ED-DPSO) for the permutation-based problems.In ED-DPSO,one part of components of the offspring comes from the longest common subsequence between the current solution and the global best solution,and the other part comes from the probability model built on the distribution information of all personal best solutions.In ED-DPSO,the current solution,all personal best solutions and global best solution contribute to the generation of a new solution.Thus,ED-PSO has more comprehensive learning ability,and can avoid falling into local minima and improve the search ability.Experiment results on two classic permutation-based problems show ED-PSO has superior performance.关键词：discrete particle swarm optimization;estimation of distribution algorithm;permutation-based problems2|3|5更新时间：2025-07-16
- 摘要：In information theory,optimal linear codes have good capability in error-correcting in coding theory and linear sequences with low correlation have been widely used in cryptography and CDMA systems.Therefore,it has great value to study the construction of optimal linear codes and low correlation linear sequences.Let R=Fp+uFp,where p is an odd prime.A class of new linear codes over R is constructed by means of the trace map.Then a kind of optimal codes over Fp is obtained via the Gray map from the punctured new linear codes.Furthermore,a class of new linear cyclic codes over R is also constructed by means of the trace map.A kind of low correlation linear sequences over Fp is observed via the generalized Nechaev-Gray map from the class of new linear cyclic codes,which are regarded as a class of linear periodic sequences.关键词：trace map;optimal linear codes;low correlation;linear sequences2|2|0更新时间：2025-07-16
- 摘要：Based on the field emission theory and resistance heating effect,the energy on workpiece surface in electrical discharge machining (short in EDM) process was modeled and its related parameters were analyzed in this paper,when the tool electrode is negative.The theoretical study and the analysis on the experimental data both show that,the resistance heating effect is the main mechanism of material removal of workpiece,and the concentration ratio of resistance heat to total work power increases with the improvement of interelectrode current and decrease with the enlargement of the discharge spot area.Moreover,the consistence of theoretical model and experimental results show that the established describing equatins of work energy are valid.关键词：electrical discharge machining(EDM);field emission;resistance heating effect;concentration ratio of power2|2|5更新时间：2025-07-16
- 摘要：The SSN (Simultaneous Switching Noise) caused by parasitic inductance of low cost QFP (Quad Flat Package) package limits the DDR (Double Date Rate) interface data transfer rate of STB (Set Top Box) chip.This paper discusses the video data interdependency and DDR bus bit interchangeability,and proposes a bit-rearrangement method to reduce SSN of DDR interface.The video data used in STB chip has strong correlation in two space dimensions.Logic bits of DDR bus are physically interlaced according to specific algorithm during layout design phase,which makes spatial distribution of DDR output drive current more balanced.The balanced distribution decreases average current running through each pair of power/ground pin and reduces SSN accordingly.This method is applied in a HDTV (High Definition TeleVision) chip on TSMC(Taiwan Semiconductor Manufacturing Company) 55nm process.The DDR data transfer rate of the test chip in QFP package attains 1066Mbps.关键词：DDR SDRAM (Double Data Rate Static Random Access Memory);SSN (Simultaneous Switching Noise);QFP (Quad Flat Package);bit rearrangement2|2|0更新时间：2025-07-16
- 摘要：Since the robust beamformer based on a single uncertainty set constraints was susceptible to the norm constraint parameter,a novel robust broadband beamforming algorithm based on the double uncertainty set constraints was proposed.In the case that the practical steering vector is constrained to two spherical uncertainty sets with different model parameter,the proposed method effectively overcomes the SINR degradation problem of the robust beamformer based on a single uncertainty set constraints.Moreover,a necessary condition under which the D-WCRB algorithm achieves different SINR performance from the S-WCRB algorithm was derived.The choices of constraint parameter were also discussed.Finally,simulation results demonstrate the effectiveness of the proposed algorithm.关键词：robust beamforming;broadband;steering vector;double uncertainty set constraint2|2|2更新时间：2025-07-16
- 摘要：In order to effectively detect ship shaft-rate(SR) electric signal,the wavelet modulus maximum's scale-distribution characteristics of the measured SR electric signal is analyzed.Based on the analysis result that the intensity and distribution density of noise's wavelet modulus maximum decreases along the scale,a detecting algorithm was proposed to extract the modulus maximum power in the highest scale as feature value to detect the target glidingly.As the wavelet reconstruction is avoided in the de-noising process using wavelet modulus,the detecting algorithm proposed can be easily achieved by hardware.In the end,the effectiveness of the proposed method is verified both using measured data and simulated data,and simultaneity compared with the detecting algorithm based on wavelet packet entropy.The verified result shows that the detecting algorithm provides a better detecting performance,and it can keep detection rate of 79% when the SNR is -10.8dB.关键词：ships;shaft-rate electric field;wavelet transformation;wavelet modulus maximum;detect2|2|3更新时间：2025-07-16
- 摘要：Similarity of spatial relations is with wide applications in normal life.Research on similarity assessment of exact direction relations is more perfect,but the presented methods based on crisp regions can not deal with the approximate direction relations.Based on the extended direction relation matrix(EDRM),the paper proposed a method for similarity assessment of approximate direction relations,and then the algorithm SA-EDRM was implemented;on the basis of the variation of location and scale of the target object,different scenarios were generated to test SA-EDRM,and the experimental results verify the effectiveness of the algorithm.In the end,an instance of Agricultural GIS was used to explain the practical value of this article.关键词：approximate direction relations;similarity of spatial relations;EDRM;the algorithm of SA-EDRM2|3|4更新时间：2025-07-16
- 摘要：A new method based on S tansforms is proposed to suppress instantaneous interference for high frequency surface wave radar (HFSWR) application.The characteristics of instantaneous interference in time and Doppler domain were discussed within the twice-FFT signal processing framework;then S transforms was applied to outline the characteristics of instantaneous interference in time-frequency domain for interference detection and excision;finally,BP neural network was used to recover the sea echo signals.Experiment results show that the anti-interference ability is enhanced by this method,and the SNR of Doppler spectrum is improved for about 10dB.2|2|3更新时间：2025-07-16
- 摘要：A novel design approach for creating an ultra-broad-band metamaterial absorber based on multilayer resistance films is provided in this paper.One unit cell of the absorber is composed of multilayer resistance films nipped between layered medium with a metal backboard.The resistance films at different layers are isomorphic,while their surface resistances are unequal.Simulated results of one four-layer absorber shown that the absorber has high absorptivity of more than 90% from 6.9 to 59.6 GHz at vertical incidence,it is polarization-insensitive and angle-wide and can keep strong absorption at TE or TM incidence when the oblique angle of incidence is 45°.In addition,the simulated results of several absorbers with different layer indicated that their absorption would be stronger along with the augment of their layers,and the absorption band is wider at the same time.关键词：absorber;metamaterial;ultra-broad-band;surface resistance;resistance film4|2|5更新时间：2025-07-16
- 摘要：For inverse synthetic aperture radar (ISAR) imaging of uniformly planar rotating objects,the characteristic of range walk and Doppler walk of a scattering center is analyzed.Thus,a method is proposed for rotation estimation and compensation.This method exploits Keystone transform to compensate for the first order range walk,and exploits matched processing to compensate for the first order Doppler walk.With the above compensation,the rotational center and velocity of a non-cooperative object may be searched.Furthermore,a complete processing scheme is formed for very high resolution ISAR imaging of non-cooperative targets,and the necessity for applying delicate imaging algorithms is investigated.Finally,experiments with some measured airplane data demonstrate the effectiveness of the proposed method.关键词：inverse synthetic aperture radar;rotation estimation;size scaling;image focusing2|2|4更新时间：2025-07-16
- 摘要：According to the characteristics of autonomous land vehicle,a global path planning method based on improved glowworm swarm optimization(GSO)is proposed.Firstly,more than one path is generated with GSO which covers multiple local optima.Then two path switching algorithms are proposed,of which one aims at optimization and the other aims at rescue.When the cross point is passed through,the optimization switching algorithm revaluates the paths,switches to the optimum path,and ultimately attains optimal actual travel route.When the environment changes,the rescue switching algorithm switches to the appropriate path by heuristic search,which reuses the original search results,avoiding the secondary planning.Many simulation experiments and actual trial show that the proposed method is feasible and effective.关键词：path planning;autonomous land vehicle(ALV);glowworm swarm optimization(GSO);secondary planning;path switching2|3|14更新时间：2025-07-16
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