最新刊期
卷 30 ， 期 12 ， 2002
- 摘要：The analytical expression of the successful probability of using an IRST sensor cueing a 3D radar is derived for a co-located radar-IRST system.With the analytical expression,the successful cueing probability can be easily obtained.The relations between the successful cueing probability and the parameters are also given.Numerical calculation of the successful cueing probability is conducted for several cases and the results verify the relations of the successful cueing probability with the parameters.Discussions are also made.The conclusions presented in this paper are useful in designing co-located radar-IRST cueing systems.关键词：radar;IRST;cueing;sensor management;performance analysis2|1088|8更新时间：2025-07-16
- 摘要：This paper deals with the measurement error of elevation angle for low-altitude target tracking with monopulse radars in the presence of multipath,which degrades the target tracking algorithms greatly.By means of the theoretical analysis and computer simulation based on real environment,we confirm that the fixed bias compensation can't solve some real scenarios' problem.Then we develop a novel compensation technique after the estimate of phase difference between direct and reflective path.Also,we can use it as a threshold to eliminate the peak error in the tracking stage.Complex monopulse ratio is utilized and the accuracy of tracking is improved,especially in some kinds of scenarios.关键词：low-altitude target tracking;monopulse ratio;bias compensation2|1616|12更新时间：2025-07-16
- 摘要：A large grained parallel imaging algorithm based on the existing sequential algorithms is presented in this paper after the deep research on parallel processing of SAR imaging,and a hybrid FFT algorithm is also presented.The algorithms are implemented on DAWNING parallel computers,with the validity of our work confirmed by the results of experiments.关键词：SAR;imaging processing;parallel imaging algorithm;FFT2|1025|1更新时间：2025-07-16
- 摘要：Motion compensation accuracy of high resolution UWB SAR is studied in the paper.First,phase errors are discussed and the phase errors tolerance is allocated.Then,the motion accuracy of radar platform is developed.The antenna fixing accuracy is studied.Finally,the paper is summarized and the conclusion is proposed.关键词：UWB SAR;phase error;motion compensation2|985|3更新时间：2025-07-16
- 摘要：When the phase-coded radars scan the stealth targets or numerous targets,which have large changes in their echo amplitudes,the weaker signals may be drowned in the range sidelobe caused by the stronger signals.A step by step way of removing the stronger signals from the echoes to eliminate their range sidelobe is presented,so that the weaker signals can be detected and the dynamic range of the radar system can be enhanced by 80dB or more.Simulation study and radar experiment indicate that the method is effective and feasible.关键词：phase codes;suppression of range sidelobe;dynamic range2|1084|5更新时间：2025-07-16
- 摘要：To lessen the computational cost of optimal weight phasor in massive linear isotropic phase-only arrays,a novel partially adaptive approach suiting for both beamforming receiving and transmission is presented in this paper.With this approach,array elements controlling nulls are partially selected adaptively (PA) and the optimal phasor is achieved by partial phase-only conjugate gradient algorithm to mitigate interferences according to the maximal signal to interference plus noise ratio(SINR).The simulations show that the computational performance will be improved greatly while the mainbeam loss,mainlobe shape distortion and nulls depth in the directions of arrival(DOA) of interference of the far-field pattern do not change significantly compared to the full adaptive(FA)case with assumptions that the number of interferences are less than half of the array elements and directions of arrival of interference are not in the mainbeam of the arrays.关键词：beamforming;interference nulling;phase-only arrays;gradient algorithm2|1042|1更新时间：2025-07-16
- 摘要：Using numerical differentiation to describe kinematics of maneuvering target,the filtering model and combined filtering-predicting model are constructed to estimate kinematics parameters of tracked object,thus the present estimation or present-prediction estimation of position,velocity and acceleration can be obtained even though the dynamics of maneuvering target is unknown. Besides,the models constructed by this approach are rather simple,suitable estimate models for various applications can be created and it is easy to select appropriate estimate algorithm for satisfactory estimate quality,so that models based on numerical differentiation are robust estimate models. Simulation result shows good quality is obtained for tracking the object with violent dynamics by the estimate models proposed in this paper.关键词：numerical differentiation;maneuvering target tracking;robust estimate model;Kalman filter2|1301|5更新时间：2025-07-16
- 摘要：Recognition of ghosts is a very important unsolved problem in two direction-finding location systems.This paper studies the problem and proposes a new method to solve it.Firstly,the bearing measurements of two passive sensors are used to estimate the initial range intervals of targets that are divided into a number of subintervals.Then,the bearing measurements are associated to judge which measurements belong to the same target.An extended Kalman filter (EKF) is designed for each subinterval.And initial probability of target lying in each subinterval is also given.The combined state estimate is obtained as weighted sums of the state estimates of each subinterval.This probability is calculated recursively according to Bayes’ rule in the tracking.If the probability is below a detection threshold this model is abolished.Simulation results show that by using the algorithm discussed in this paper two passive sensors can locate and track multiple targets at the same time.关键词：direction-finding location;extended Kalman filter;update probability;multitarget tracking2|1523|14更新时间：2025-07-16
- 摘要：This paper has analyzed the PN code acquisition performance effects of adaptive narrow-band interference suppression filters in spread-spectrum systems based on detailed theoretical derivation.And complied with the theory of filters,the arnplitude frequency responses and group delay responses of adaptive narrow-band interference suppression filters,as well as the simulated results,are presented.These theoretical and simulated results show that because of narrow-band interferences and part of spread-spectrum signal being rejected by the adaptive interference suppression filter in the same time,large side-lobes will be formed in the output of correlator and the performance of PN code acquisition will be seriously affected.关键词：spread-spectrum systems;adaptive narrow-band interference suppression filters;PN code acquisition2|1377|2更新时间：2025-07-16
- 摘要：Phase retrieval techniques are key to phaseless near-field measurements and holographic diagnoses.Based on the probe correction,the weighed functional are constructed and the phaseless measurement condition is presented to avoid local extremes.For the purpose of iterative efficiency and practicality,Fletcher-Reeves conjugate gradient method is modified by the application of re-beginning technique,FFT algorithm and construction of initial guess.Numerical simulations show that the search variables should be selected as less as possible in virtue of a priori information on the antenna under test and near-field measurements.Experimental results prove this technique to be accurate and efficient.关键词：near-field measurements;phase retrieval;probe-corrected;functional extremes;conjugate gradient method2|1233|1更新时间：2025-07-16
- 摘要：This paper presents a three-dimensional propagation model for path-loss prediction in an urban microcell,based on ray-tracing techniques.A new efficient ray-tracing technique based octree technique,which was used in computer graphics before,is presented.Numerical results based GO/UTD for received power are in agreement with the measured data and that predicted by FDTD.关键词：microcell;ray-tracing;octree techniques;UTD;path-loss2|1401|9更新时间：2025-07-16
- 摘要：Multiple access interference(MAI) is a key problem in DS-CDMA.Both multiuser detection method and array antennas have been introduced to reduce the effect of the MAI respectively.In this paper,the two methods are combined and a novel space-time blind adaptive RAKE receiver is presented.With numerical simulations and performance analysis,it is shown that the receiver has the excellent performance in eliminating the MAI and resisting the effect of the"near-far"problem.Furthermore,the adaptive version of the receiver can converge rapidly.关键词：DS-CDMA;RAKE receiver;space-time processing;multiple access interference;multipath fading channel2|758|2更新时间：2025-07-16
- 摘要：A novel single-user receiver based on ICA in asynchronous multipath DS/CDMA channels is proposed in the paper,which require prior knowledge of only the spreading waveform and the timing of the desired user's signal.It is seen that the proposed single-user receiver offer substantial performance gains over the matched filter and blind MMSE multiuser detector.关键词：CDMA;single-user receiver;ICA2|814|0更新时间：2025-07-16
- 摘要：In this paper,An image retrieval method is proposed based on DCT compressed-domain.With the partial decoding of DCT-encoded image data,the image features are extracted directly from the compressed domain.At first,reorder the DCT parameters in compressed-domain to get the directionality and multi-resolution for extracting the sketch of image.And then retrieved images by the CRH (Connected-Region Histogram) of image sketch.At last,we can sort the retrieved result by the gray histogram of DC map.The method is robust to gray,rotation,translation,and so on.The experimental results show that the proposed method is effective in image retrieval.关键词：content-based image retrieval (CBIR);DCT;image retrieval in compressed-domain;connected-region histogram;gray histogram2|1246|5更新时间：2025-07-16
- 摘要：Methods used in TDMA mobile communication to eliminate cochannel TDMA interferences is presented.since these methods use the spatial filtering,it is reasonable to use adaptive patterns to analyze the performance.Discussion about the performance of these methods is made from the view of adaptive patterns with methods which have close-form solutions.An actual signaling scenario is presented,and is followed by the simulation results such as adaptive patterns and the SINR of array output,using 8-element array and 4-element array.Factors which influence the effect of cochannel interference imination are discussed.关键词：adaptive arrays;cochannel interference;least-squares methods;GSM;TDMA2|903|1更新时间：2025-07-16
- 摘要：Compact Antenna Test Range (CATR) has become a popular alternative to conventional high accuracy antenna and RCS measurements.One of the key problems in CATR research and manufacture is electrical readjustment after mechanical installation and adjustment. According to Plane Wave Spectrum (PWS) theory,distribution of extraneous waves in angular domain will be obtained by making inverse Fourier transform to test zone field,which provides the guidance for eliminating them.In this paper,simulation results assuming there exist one or more extraneous waves are presented.An actual example in CATR engineering is also given.Chebyshev window ,whose sidelobe level is adjustable,is adopted.关键词：Compact Antenna Test Range (CATR);Plane Wave Spectrum (PWS);radar cross section (RCS);Chebyshev window.2|1412|5更新时间：2025-07-16
- 摘要：The article advanced the conception of complete information and affinity of information,discussed the related properties of information and the association between the properties and computation,made a conclusion that there was a difference between computation of information and of general sets,also explained the causes of the difference.Meanwhile,the article defined the information function based on the recognition model,and assigned relative topics and their computation.关键词：grey information;differential information;information function;recognition model2|978|1更新时间：2025-07-16
- 摘要：Differential algebraic method is an effective technique in computer numerical analysis.It can exactly implement differentiation up to arbitrary high order based on the nonstandard analysis theory.The principle of differential algebraic method is applied to calculate arbitrary high order aberrations of electrostatic electron lens systems.An example is given to show that the numerical results have excellent accuracy,and the accuracy is limited only by the machine precision and the arithmetic errors.The arbitrary high order aberrations are conveniently calculated by differential algebra method and the fifth-order aberration diagrams are given.关键词：differential algebra;electrostatic electron lens;aberration analysis2|1540|0更新时间：2025-07-16
- 摘要：Since lack of effective methods to describe the probability density functions of the features of Chinese characters,Bayesian classifiers are rarely used in the Chinese character recognition systems.In this paper,a method,which can describe the probability density function of a feature with only 6 digits,is proposed.Based on this method,a handwritten Chinese character recognition system using a Bayesian classifier is constructed.In our experiments,the classifier showed good performances.关键词：Bayesian classifier;Chinese character recognition;probability density function2|1318|2更新时间：2025-07-16
- 摘要：Distributed parallel is an important research and development field in many years,but the researches and developments are only limited to the inside of the distributed parallel system.The interactions between the server and its outside (such as clients) are performed by only one channel (for instance,a computer).The channel is a bottleneck,limiting the reliability/availability,speed up ratio,efficiency,frequency band and I/O response speed of the system.The nodes of the distributed parallel server with the distributed parallel I/O interface presented in this paper can directly interact on the clients.The client demands over 80 percent are directly sent to the nodes that they can provide required services,while only few demands need dynamical schedule again .The is a broad band network server.The emphasis of the paper is to compare the performances among the distributed paraallel server and single computer server,mirro-image server,two-redundancy computer server and cluster server.The results show that this new server is the best one among these servers.The first version of this server is already researched and developed successfully,it is used,and it will go to market.关键词：distributed parallel I/O interface;distriibuted parallel server;broad band network server2|1788|6更新时间：2025-07-16
- 摘要：Electric power automatization is the most important approach that can ensure electric power system running safely,steadily and reliably and the task scheduling efficiency of which greatly affects on the performance of system.This paper analyzed the real-time task characteristics of electric power automatization scheduling center and presented a new distributed dynamic mirror service model.Furthermore,based on these work,we presented a new scheduling algorithm——dynamic fuzzy scheduling (DFS) algorithm whose base is the fuzzy decision-making set that comes from fuzzy transform.The emulation results show that the DFS system owns excellent response characteristic,service capability and reliability,and has a great improvement compared with RT-SADS system.关键词：electric power automatization;distributed dynamic mirror service model;dynamic fuzzy scheduling4|885|0更新时间：2025-07-16
- 摘要：The problem of sensor gains estimation is studied in two-dimension(2-D) DOA estimation system with dual circular array.By dividing the array into linear sub-arrays,we can transform the problem into combined estimation of DOA and sensor gains in linear array system.Under the constraint of DOA angles and sensor gains in the signal subspace,the estimation of sensor gain can be obtained without any calibration source.关键词：dual circular array;2-D DOA;sensor gains calibration2|958|1更新时间：2025-07-16
- 摘要：An approximate polynomial of the SRS Stokes spectrum is obtained by digitized fit from the experimental measurements of R.H.Stolen.It has some theoretical value with its certain precision.Upon the Stokes spectra formulae,we researched the Raman gain and Noise figure in Raman amplifier with different fibers.It shows that the difference of the gain and noise figure is contributed by the effective core area of different fibers.关键词：Stokes spectrum;Raman gain;noise figure;effective core area4|929|0更新时间：2025-07-16
- 摘要：Component assembly technology is one of the core technologies of component software.This article analyzes the status of current component assembly mechanism,pointing out the weaknesses of some representative assembly mechanisms,and then presents a new component assembly technology based on mobile agent.It uses the late assembly technology to overcome such defects of traditional component assembly mechanism as being difficult to modify and inflexible.Relying on the Group Table and Location Table presented,we implement the separation of the functional body and the assembly mechanism,developing and compiling them independently.Last,an example was introduced in the article to illustrate the component late assembly technology in Cogent.关键词：mobile agent;component assembly;component2|963|7更新时间：2025-07-16
- 摘要：Quantum computing is a new technology developed in recent years.It has great computing power,but the research is by simulation on classic computer.The base of quantum computing simulation is vector operation.To enhance the power of vector operation can improve the performance and efficiency of quantum computing simulation.YH TS-1 is a 32-bit embedded microprocessor designed by School of Computer in National University of Defense Technology.This microprocessor has been integrated with classic vector operation technology.This paper introduces the vector operation architecture in YH TS-1 microprocessor,giving a basic implementation of quantum computing on the YH TS-1 microprocessor.We test the performance enhancement by resolving the Deustch-Josza problem on scalar processor and YH TS-1 with vector component.At the end of this paper,how the design of vector component impacts on the performance of quantum computing simulation and its improvement methodologies are discussed.关键词：quantum computing;micro processor;vector computer2|1249|1更新时间：2025-07-16
- 摘要：Multimedia storage systems need to handle continuous media data and conventional types of data.Continuous media data access requires high I/O rates and tends to last for a relatively long period of time.However this can drasticaly degrade the performance of accesses to other data types.A new cooperative caching policy called GLNU suitable for the access to continuous media is proposed in the distributed multimedia storage systems.Simulation results indicate our new policy outperforms other cache management policies and greatly improves the cache hit rate and thus reduces the disk I/O for continuous media data.关键词：distributed system;multimedia storage system;cooperative caching2|901|2更新时间：2025-07-16
- 摘要：The accuracy of speech recognition is still a bottleneck to baffle the application of speech technology.The accuracy of recognition may be improved greatly by using context knowledge efficiently.In web speech browsing,user's speech input is usually one element of a finite set.Based on these observations,this paper first defines a kind of similarity between two Chinese text strings,then processes the recognition results of engine to acquire more accurate results.Experiments show that our approach is mostly efficient:the accuracy is improved from less than 60% to more than 95%.关键词：web speech browsing;similarity;speech recognition and understanding2|1218|3更新时间：2025-07-16
- 摘要：Immune algorithm has become a hotspot in the area of computational intelligence.We proposed an immune algorithm based on immune recognition(IAIR).The design of IAIR was inspired by the negative selection mechanism in the biological immune system and its idea was different with current optimization methods in that it got the good solution by excluding bad solutions.This paper introduced in detail the design of IAIR,analyzed its ability and time complexity.We also designed experiments to solve the TSP problem.The theoretical analysis and experimental results showed that IAIR had a good ability of problem solving.关键词：immune algorithm;immune recognition;negative selection;TSP2|1591|6更新时间：2025-07-16
- 摘要：To improve the weight learning efficiency of multilayer feedforward network,a new similar LM learning algorithm is proposed by introducing modified conjugate gradient method in solving of large-scale linear equation sets.In addition to the fast convergent advantage the LM method demonstrates that,the new algorithm not only reduces the training time and overall complexity,but also achieves training accuracy and generalization capability comparable to more standard approaches.Extensive simulation results are provided to show the effectiveness of the new algorithm.关键词：neural network;Levenberg-Marquardt algorithm;conjugate gradient method;supervised learning2|1049|5更新时间：2025-07-16
- 摘要：The thermal behavior of the ring-plane TWT in the interaction area was analyzed by means of the thermodynamic method.The geometric factor,which describes the thermal resistance of the structure for constant thermal conductivity,was defined by solving the heat conduction equation.Starting from the definition of the geometric factor and taking the interface heat resistance into account approximately,the actual temperature rising of all assemblies of the TWT was calculated under the case of that the thermal conductivity varies with the temperature.Making use of the numerical results,the maximum temperature was also given in this paper.The influences of the thermal and geometrical parameters on the heat behavior were discussed.The results presented here are beneficial to the design of the ring-plane TWT.关键词：ring-plane travelling wave tube;interaction area;thermal analysis2|997|0更新时间：2025-07-16
- 摘要：In this paper,an efficient implementation of the topography adaptive filter based on local frequency estimation is proposed.This filter tunes its central frequency according to the local topography to preserve the tight fringes of the interferometric phase map as well as reduce the phase noise.We describe the structure and the implementation of this topography adaptive filter in detail.The 2D chirp-Z transform is applied to improve the efficiency and accuracy of the frequency estimation.X-SAR data of Mt.Etna is employed to show the effectiveness of this filter in comparison with the traditional multilook filter in term of fringe preservation.2|1159|8更新时间：2025-07-16
- 摘要：In this paper,two concepts of observation variable set correlation and observation variable set non-correlation are defined.According to these concepts,multi-target measure data association in the multiple passive radar system is researched theoretically.Three-TDOA data association algorithm and four-TDOA data association algorithm are analyzed based on the TDOA passive radar system.Simulation results show their validity and feasibility.关键词：passive radar position location;multi-target data processing;data association2|1418|7更新时间：2025-07-16
- 摘要：Based on the theoretical analysis and experimental research of the human binocular vision and the relationship between psychological stereoscopy and physiological stereoscopy,a novel practical method,to convert 2D pictures into 3D pictures by means of adding random binocular disparities to planar pictures only having psychological depth cue,is presented in this paper.Experiments show that the binocular depth cue can be obviously enhanced by this method.2|957|5更新时间：2025-07-16
- 摘要：The resonant quadrifilar helix antennas have been widely applied to space communication links because of its relatively small volume and light weight plus its capability of providing shaped-conical beam,end-fire radiation without requiring a ground plane.The paper designs two actual resonant quadrifilar helix antennas with a novel 90°self-phased feed structure and a special infinite balun.The actual antennas are simulated by the finite element method.The simulation resultwell fits the measured data.关键词：resonant quadrifilar helix antenna;shaped-conical beam;90°self-phased structure;infinite balun;finite element method2|1525|2更新时间：2025-07-16
- 摘要：Evolutionary algorithm is a new kind of effective algorithms for very complex nonlinear programming problems.However,the amount of their computation is often large.To reduce the amount of the computation and make the algorithms more effective,the uniform design is used to design new effective evolution operator.The new evolution operator has the local-search property similar to that in traditional optimization techniques,thus it can generate a diversity of population and explore the search space effectively with little computation.Moreover,the new algorithm is globally convergent.The numerical results also show the effectiveness of the new algorithm with its less computation,higher convergent speed for all test functions.关键词：evolutionary computation;uniform design;nonlinear programming2|1170|4更新时间：2025-07-16
- 摘要：The main idea of SVM used for classifying nonlinear separable data is to map the data into higher dimension linear space in which the data can be separated by a hyper plane.Based on Jordan Curve Theorem,a universal classification method based on hyper surface,which is called HSC classification,is put forward in this paper.The classification hyper surface is directly made to classify massive data according to whether the wind number is odd or even.It is a novel approach that does not need to make mapping from lower dimension space to higher dimension space and considering kernel function too.It can directly solve the nonlinear multiclasses classifying problem.The test reports show that HSC can efficiently and accurately classify large data.关键词：support vector machine;separating hyper surface;Jordan Curve Theorem;HSC classification method2|874|0更新时间：2025-07-16
- 摘要：The mixtures of factor analyzers are able to model complex data structures through a combination of the factor analysis model and the Gaussian mixture model.In this paper,a resampling method for the mixtures of factor analyzers is proposed.After approximating the probability distribution density of the data by the Gaussian mixture model,we draw new samples for each of the component Gaussians with its own parameters separately,then on the new samples the factor analysis is performed for each component Gaussians.We also implement this method with the EM algorithm and the good performance of the method is illustrated by an example.关键词：factor analysis;gaussian mixture model;EM algorithm;sampling2|1559|2更新时间：2025-07-16
- 摘要：In this paper,based on the space-time two dimensional MUSIC algorithm,a new method utilizing the received information of user instead of pilot signal during the period of normal communication is proposed to estimate DOA and multipath time delay of the signal of interesting (SOI) user in CDMA system.The eigenvalues and eigenvectors of the covariance matrix formed by a new data model is computed first,then the DOA and time delay can be found by searching noise subspace with a new steering vector.It is not required that the number of the received signals be less than that of the array elements.The DOA closed in space (or the same DOA) and multipath time delay of the SOI of different time delay can be estimated.关键词：the space-time MUSIC algorithm;signature sequence;DOA;Multipath time delay2|1109|2更新时间：2025-07-16
- 摘要：A method for multi-LFM signals time-frequency representation is proposed.Firstly, we use the Radon-Ambiguity transform to get the linear kernel function, which can remove the cross terms of multi-LFM signals and some part of noise in the ambiguity domain.Then we use the two-dimensional Fourier transform to get the new time frequency representation.The validity of removing noise and cross terms of this method has been shown by computer simulation even in low signal to noise ratio condition.关键词：LFM;Radon-ambiguity transform;kernel function;ambiguity function2|965|2更新时间：2025-07-16
- 摘要：A new electronic countermeasure method to synthetic aperture radar(SAR),which is called scatter-wave jamming(SWJ),is discussed in this paper.The characteristics of SWJ and its jamming effect on SAR image are analyzed.It shows in principle that this new jamming method can get better jamming effect than classical jamming techniques.Furthermore,the simulations of SWJ to spaceborne SAR and airborne SAR are executed,and results are given.关键词：synthetic aperture radar;scatter-wave jamming;SAR image2|1931|36更新时间：2025-07-16
- 摘要：This paper put forward a single observer passive location model and method of fixed radiation source using azimuth and elevation angle and its changing rate of information,and indicated that this method could give the position of emitter in a single measurement.It also analyzed the location error and observability of these two methods.In the end of the paper,it gives computer emulation of single measurement and Kalman filtering emitter location and gives a conclusion.关键词：passive location;observability;azimuth angle;elevation angle2|1684|12更新时间：2025-07-16
- 摘要：A new method for the design of broad-band and wide-angle circularly polarized (CP) microstrip patch antennas is presented in this paper.Based upon the proximity coupling balance-feed by utilizing capacitively probes,the 2 V standing wave ratio(VSWR) and wide-angle 3dB axial ratio (AR)(in the 45°conic airspace ) bandwidth can be achieved more than 20%.The measured results show that the wide-angle 3dB axial ratio and 2 V standing wave ratio bandwidth of the patch antenna designed by this method is 26.33%(VSWR≤2,wide-angle AR≤3dB).So this design technique is correct and practical.关键词：wide-angle circularly polarization;balance-feed;microstrip antenna2|1673|4更新时间：2025-07-16
- 摘要：Probability data associating filter (PDAF) was first introduced by Bar-Shalom,and was used widely in many areas such as target track in radar.In this paper,the moving characteristics of dim target in image sequence are firstly analyzed.And based on the analytical results and the basic idea of PDAF,a new PDAF algorithm to track dim point moving target in images sequence is derived.Theoretical and experimental results are included to demonstrate the performance of the proposed method.关键词：dim point target;image sequences;probability data associating filter;target tracking4|966|2更新时间：2025-07-16
- 摘要：The paper has analyzed Latch-up characteristics in high temperature CMOS integrated circuits.In this paper,we propose a latch-up effect model for submicron and deep submicron integrated circuits.We find there are two sub-models about CMOS integrated circuit Latch-up effect.The base width of a parasitic transistor is long in a big size MOS IC,and the base transport factor dominates.The device size is small in VLSI and ULSI.The base width of a parasitic transistor is shorter,and emission efficiency dominates.But their holding currents are all negative index number power about temperatures.The paper has given relations between holding current and temperatures from 25℃ to 300℃ range.The experiment results are essential agreement with the model that the paper has given.关键词：high temperature LDD CMOS integrated circuits;latch-up characteristics;analysis expression2|1722|1更新时间：2025-07-16
- 摘要：Technology of passive location has broad prospects in applications.In this paper,the method using phase difference rate of change for single observer-passive location is introduced based on existing methods.We can obtain the direction of the target with phase difference information of two orthogonal interferometers on the observer and the radial distance with corresponding phase difference rate of change.Then the target can be located with high speed and precision.When flying posture of the observer is changed,the target can be located in the new coordinate system according to measurement data.And its position in the original coordinate system can be obtained through the rotating matrix between two coordinate systems.Related locating expressions are given.Simulations show that this method is effective.关键词：phase difference;rate of change;single observer;passive location;variant posture;direction;radial distance2|1375|13更新时间：2025-07-16
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