最新刊期
卷 43 ， 期 1 ， 2015
- 摘要：Measurements and characterizations are rarely conducted about indoor self-interference channel of CCFD(Co-time Co-frequency full-duplex).An extensive self-interference channel measurement is performed at 2.6GHz under typical indoor environment with channel sounder based on vector network analyzer.By analyzing the measurement data,the empirical channel characteristics such as path loss exponent,RMS(root-mean-square)delay spread have been extracted.Results show that path loss exponent and RMS delay statistics are different according to antenna separation of transmitter-receiver.When the separation is larger than 1m,the path loss exponent is 1.86,and the RMS delay statistics follow lognormal distribution.When the separation is less than 1m,the path loss exponent is 1.52,and the RMS delay statistics at different antenna separation follow lognormal distribution whose mean and variance are linear functions of antenna distance respectively.3|2|8更新时间：2025-07-16
- 摘要：Variable regularization (VR) parameter technique is an important method to improve the tracking performance of affine projection adaptive filtering algorithm.Existing VR algorithms suffer from environmental noise and estimation errors,making it slow to converge and have a large steady-state error.Based on the analysis of the relationships between noise-free a priori error vector,noise-free a posterior error vector and excess mean-square error,a novel VR method via minimizing energy of the noise-free a posterior error vector is proposed to improve the tracking performance.The statistical variance of the measurement noise and a smoother and more easily-controlled exponential scaling factor estimation method are used for practical implementation.Reduced steady-state misalignment and improved convergence speed as compared to conventional algorithms are demonstrated by simulations in system identification scenarios.关键词：adaptive filtering;affine projection algorithm;energy of the noise-free a posterior error vector signal;variable regularization parameter;exponential scaling factor2|3|0更新时间：2025-07-16
- 摘要：Traditional dual threshold narrowband interference suppression algorithm cannot adaptively process received signal with large SNR dynamic range.Based on dual threshold algorithm,the basic idea of adaptive tri-threshold narrowband interference suppression algorithm was proposed.Combining system parameters,threshold coefficient selection method,interference detection and suppression method were studied.Simulation results show that this algorithm has excellent anti-jamming performance.关键词：spread spectrum;frequency domain;interference suppression;threshold2|2|4更新时间：2025-07-16
- 摘要：In this paper we introduced the notion of decision premise,and formed decision implications with decision premises as premises and closures w.r.t.decision subcontext as consequences.It was proven that such decision implications constitute the so-called decision canonical basis,i.e.,it is complete,non-redundant and of minimal cardinality among all complete sets of decision implications.We also described an algorithm to generate decision implication canonical basis and analyzed time complexity of this algorithm.Experiments showed that decision canonical basis can greatly reduce redundant decision implications and is more efficient than other decision implication bases.关键词：decision implication;canonical basis;concept lattice;minimal generator2|2|12更新时间：2025-07-16
- 摘要：Severe pollution of salt-and-pepper noise with high probability in digital images is widespread,such as to eliminate less information and noisy noise has many difficulties.Although light pollution of salt-and-pepper noise with low probability in digital images can be completely removed,it lacks of universal sense in actual image restoration.In this paper,aimed at the fuzzy partition in the gray-value spaces and fuzzy numbers describing the gray-value level,the extreme value method is used to conduct the noise with the high probability test and establish the suitable filtering window.And then,applying the defuzzification method of center of generalized gravity and the membership functions corresponding to the non-noise points to design a kind of new filter.Finally,we obtain that the filter can effectively filter the salt and pepper noise with high probability in digital images by simulation example,and its denoising performance is superior to other common filters.关键词：salt-and-pepper noise with high probability;fuzzy partition;suitable filtering window;fuzzy filter;image restoration2|2|11更新时间：2025-07-16
- 摘要：Remaining useful lifetime (RUL) estimation is a key issue in prognosis and health management for industrial systems.Currently,the use of the observed degradation data of a system holds promise to estimate its RUL.Due to the effect of system's stochastic deterioration and uncertain measurements,the measured data are inevitably contaminated by the stochasticity of the degradation and measurement uncertainty.However,in current studies of the RUL estimation based on the measured data,there is no report considering the effect of the degradation stochasticity and measurement uncertainty on the estimated RUL distribution.In this paper,a new degradation modeling approach is proposed based on Wiener process,which considers system's stochastic deterioration and uncertain measurements simultaneously,and the Kalman filtering technique is utilized to estimate the underlying degradation state.On the basis of the estimated degradation state,the analytical RUL distribution is derived which accounts for the uncertainties in the estimated degradation state and measurements.Additionally,a parameter estimation method for the developed model is presented based on the maximum likelihood method.Finally,a case study for gyros verifies the proposed method and the results indicate that the proposed method is superior to the method without considering uncertain measurements and can improve the accuracy of the estimated RUL.关键词：remaining useful life estimation;degradation model;uncertain measurements;Kalman filter2|3|21更新时间：2025-07-16
- 摘要：How to improve the parallel performance of CFD applications with typical multi-block structured grid based on the CPU sub-platform of Tianhe-1A and CPU+MIC co-processor heterogeneous platform of Tianhe-2 supercomputer system,is focused in this paper.Some strategies of performance optimization matched with both the characteristic of CFD application and the architectures of high-performance computing (HPC) platform are discussed in detail.Some numerical experiments are performed on Tianhe-2 supercomputer system with the maximum of grid cells achieving 6.8×1011,and the total amount of processors and/or co-processors being 1.376×106.It shows that the optimized code can get a speedup of 2.6 times faster on CPU and co-processor hybrid platform than that on the CPU platform only,and good scalability is also observed from the test results.关键词：computational fluid dynamics;multi-block structured grid;parallel computing;Tianhe supercomputer;CPU+MIC heterogeneous computing2|2|2更新时间：2025-07-16
- 摘要：In order to further improve the cooperative performance of evolutionary populations to solve out the optimal solution for attribute reduction in rough set theory,a novel attribute equilibrium reduction algorithm(named AERQG)with quantum game based on mixed co-evolutionary populations' collaboration is proposed.In this algorithm,the collaboration model of co-evolutionary populations based on the self-adaptive multilevel evolutionary tree is constructed.The mixed co-evolutionary mechanism,which is both competitive co-evolution for evolutionary individuals in populations and cooperative co-evolution for representative elitists between populations,is adopted to carry out the populations' co-evolution.This mechanism can better obtain the balance of attribute co-evolutionary reduction between exploitation in breadth and exploration in depth.Moreover,the compensation mechanism of trust margin is introduced into the quantum game model for multi-populations elites.The population elite can be sure to find out the respective optimal subset of attribute reduction by using the quantum game strategy,and thus the global optimal collaboration set of attribute reduction under the Nash equilibrium is achieved steadily.Experimental results demonstrate the proposed algorithm has achieved better high-performance on efficiency and accuracy than traditional algorithms.Further,the efficient reduction and segmentation for brain magnetic resonance imaging(MRI)in the incomplete electronic medical record system verifies its stronger practicality and robustness.关键词：attribute evolutionary reduction;self-adaptive evolutionary tree;mixed cooperation;trust margin;quantum game;NASH equilibrium2|2|1更新时间：2025-07-16
- 摘要：Top-n recommendation technology has recently received a lot of attention in information service community.In this paper,we study the problem of top-n recommendation under the cloud data.Firstly,we propose a multilayer distributed storage architecture(MDSA)which can fit the need of top-n recommendation.Secondly,based on the consideration of reducing the cost of network transmission,we present the data encoding pattern which is based on the MDSA architecture.Lastly,we fast realize top-n recommendation using the map/reduce distributed programming model.For satisfying the realistic requirement,we further present three application variants of top-n recommendation.Massive experiments demonstrate that our approach is efficient and has high overall performance.关键词：cloud data;top-n recommendation;MapReduce;information service2|2|2更新时间：2025-07-16
- 摘要：The complex background is an important inference factor of scene text automatic localization algorithm.To eliminate the impact of background,this scheme firstly obtains the saliency region in saliency map according to the spectral residual theory.Then it computes text confidence map in saliency region,which is weighted sum of the fraction map of corresponding pairs based on stroke feature and the posterior probability map based on Fourier spectrum statistical feature.Finally,it combines saliency map,text confidence map and HSI color feature with the graph model to suppress the background and highlight the foreground text.The experimental results on both the ICDAR2011 scene text localization competition test dataset and laboratory Chinese dataset show that the scheme can effectively suppress the complex background and improve the scene text localization algorithm.关键词：scene text;background suppression;visual saliency;stroke feature;Fourier spectrum statistical feature2|2|5更新时间：2025-07-16
- 摘要：In order to solve the nonlinear and inconsistent problem of printer in CIE color space,a new channel-signal reproduction method based on gamut partition iterative subdivision was proposed.First,the theory of gamut partition was modified,then the "neighborhood" concept was introduced in modified partition.With the adjustment of "neighborhood",the calibration range of object color signal was optimized,and the precision of reproduction color signal could meet requirement.The experiment result showed the new method has higher precision and stability.关键词：color management;color characterization;partition correction;gamut partition iterative subdivision2|2|2更新时间：2025-07-16
- 摘要：In visual tracking,how to construct an object model to cope with the appearance change is one of the key problems to improve tracking precision and stability.To resolve this problem,this paper proposes to construct a local patch model using the initial labels of the pixels in tracking area,and proposes an online visual tracking algorithm based on local patch learning under the framework of Bayesian theory.The detailed operation is as follows.Firstly,it constructs the local patch model according to the initialized tracking area.Then,it utilizes the object model to learn the local patches in current tracking area and estimates the current state via Bayes estimation.Finally,it updates the local patch model by feature clustering.The experiment results indicate that the proposed algorithm obtains a distinct improvement in coping with appearance change,and exceeds the recent local patch-based trackers in both tracking precision and stability.关键词：visual tracking;local patch model;Bayes estimation;model update2|2|3更新时间：2025-07-16
- 摘要：Dual logic based polarity conversion and polarity optimization method is proposed for logic synthesis of mixed polarity RM (Reed-Muller) circuits.The correctness of the proposed method is proved in theory,and the validity and feasibility is verified by experiments.The proposed method can contribute to applying the methods for polarity conversion and optimization of MPRM (Mixed-Polarity RM) to MPDRM (Mixed-Polarity Dual form of RM).The results of mapping to FPGA (Field Programmable Gate Array) after logic synthesis for fifteen XOR-based logic circuits from MCNC show that on average,compared to the FPGA implementations of optimized designs obtained by logic synthesis tools such as Espresso and ABC,mixed polarity RM circuits have superiority in area and speed,and MPDRM circuits can achieve optimal FPGA implementations.关键词：RM circuits;mixed polarity;logic synthesis;dual logic;polarity conversion;polarity optimization2|2|13更新时间：2025-07-16
- 摘要：Aimed at the scheduling problem of dynamic segment of FlexRay,the formulas both for message transmission period and the length of message frame are put forward firstly which are unrelated to FID assignment based on the AUTOSAR specification,and then a BIP model is built based on the load balancing of parallel multi-processor scheduling model.To solve the large scale message scheduling problem,a period increasing longest-processing-time-first (PILPT) algorithm is proposed as well as a phase reserving LPT (PRLPT) algorithm,which is proposed to prevent the longer period message from occupying the position of the shorter,and a general suggestion for the choice between the two algorithms is given finally.The simulation results show that,whether for the fixed message set of J1939 or variable message set with a large number of messages and wide length distribution,PILPT and PRLPT algorithms both have outstanding performance in optimizing ratio,load balance and the calculating speed.关键词：FlexRay;AUTOSAR;message scheduling;dynamic segment;in-vehicle communication network2|2|1更新时间：2025-07-16
- 摘要：Three definite-solutions problems,which are divided from the oxide layer and Si substrate for ultra shallow junctions MOSFETs,are presented.A 2-D potential analytical model for the Sub-45nm MOSFETs with ultra shallow junctions,which the unknowns can be solved by the eigenfunctions expansion from the connected condition identity,is derived.The sub-threshold current model is also presented.According to the comparison with MEDICI,the model can accurately simulate the sub-threshold 2-D potential and current of USJs 15-45nm MOSFETs.关键词：ultra shallow junctions sub-45nm MOSFETs;2-D potential semi-analytical model;sub-threshold current2|2|1更新时间：2025-07-16
- 摘要：The transmission characteristics of zero index metamaterials loaded with WGM(Whispering Gallery Mode)ring is studied theoretically in this paper.Based on two-dimensional situation,through calculating the resonant frequencies of the WGM placed into the zero index metamaterials,the condition of total reflection is obtained,and the characteristics of the certain mode are studied.Furthermore,the effect to transmission characteristics of the μx→0 metamaterials loaded with WGM ring is explored,and perfect transmission can be realized.Its correctness is proved by simulation using COMSOL.The conclusion has important value in applications for sensor,gathering energy,and cloaking objects etc.关键词：zero index metamaterials;WGM;transmission characteristics2|4|0更新时间：2025-07-16
- 摘要：To solve the parameter selection problem in the design of visual prosthesis wireless power transfer system,this paper precisely models visual prosthesis wireless power transfer system on the basis of biological capacitance.Based on this model,the secondary coil circuit of the wireless power transfer system is optimized,with which the energy transfer efficiency is improved obviously compared to the traditional resonant coupling method.Experimental measurement data from the comparison and analysis between two different-sized coils highly match the simulation data in the modeling,and it verifies the correctness of the modeling and the feasibility of the optimization scheme,providing theoretical reference to the coil option of visual prosthesis clinical application and the design of wireless energy transfer system.关键词：visual prosthesis;wireless power transfer;biological capacitance;system modeling;efficiency optimization3|3|3更新时间：2025-07-16
- 摘要：The heterogeneous many-core system has emerged as a promising developing trend in the high performance computing area.In this paper,we first revealed the developing trend and dominant position of the heterogeneous systems via analyzing their architectures,programming and application characteristics.Secondly,we discussed the programming model and performance optimization of current heterogeneous systems,and summarized the relative research trends.Thirdly,we verified the different application behaviors of the GPU and MIC heterogeneous system by running different types of Benchmark,which provides the reference for user to select the specific heterogeneous computing platform and,the basis of composing the hybrid heterogeneous system which combines the two types of many-core processor(GPU and MIC)into an individual computing node.This hybrid heterogeneous system can fully exploit the computing potential of the two types of many-core coprocessors to coordinate handling the complex application with different application behaviors.Finally,some open issues and future directions in the heterogeneous system were viewed.关键词：heterogeneous many-core system;high-performance computing;heterogeneous computing;programming model;performance optimization2|4|9更新时间：2025-07-16
- 摘要：Multi-physical scale modeling for simulating the electrophysiological dynamics of the heart is rapidly evolving and has made significant progress in the last decade.In this paper,we briefly review the current development of cardiac modeling field with a particular focus on the modeling of short QT(SQT)syndrome arising from gene mutations in cardiac potassium channels.Firstly,we introduce Denis Noble's definition on multi-physical scale modeling of cardiac systems at sub-cellular,cellular,tissue and whole organ levels.Secondly,we describe quantities that have been used to characterize the functional impacts of SQT gene mutations on the electrical activity of cardiac systems at cellular,tissue and whole organ levels.Then we review up-to-date research results on quantifying the functional impacts of three SQT gene mutations associated with potassium channels on the genesis of cardiac arrhythmia that underlie cardiac sudden death.Finally we outline possible research and application prospects of the electrophysiological modeling and simulation of SQT syndrome in the future.关键词：virtual heart;computational cardiology;modeling and simulation;short QT syndrome;gene mutation2|2|1更新时间：2025-07-16
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New Structure for Dealing with Frequency Mismatch of Narrowband ANC System Based on IIR Notch Filter
摘要：Since the narrowband active noise control (ANC) system always gives rise to frequency mismatch (FM),the traditional frequency mismatch compensation (FMC) technique can cope with small FM,but is unable to deal with non-stationary noise signals or large FM.In order to solve the above problem,a new ANC structure with a frequency estimator is first introduced,whose inputs are measured by both the acoustic and non-acoustic sensors.The IIR notch filter based on plain gradient (PG) algorithm is employed as the frequency estimator,and the adjustment of amplitude and phase of secondary source is achieved by a first-order FIR filter updated by filtered-x LMS (FXLMS) or RLS (FXRLS) algorithm.Simulations indicated that the new system,in the condition of ensuring reasonable steady-state error,compared with the traditional FMC system,could effectively handle larger FM and revealed fine convergence and tracking performance.关键词：narrowband active noise control;frequency mismatch;non-stationary noise;IIR notch filter;variable pole radius2|3|3更新时间：2025-07-16 - 摘要：In order to resolve the detection problem of passive remote weak targets under the background of strong interference,a detection algorithm based on adaptive beam space transformation using acoustic vector sensor array is proposed.Firstly,by designing a beamspace matrix which covers the observed sector and rejects the interference signals out-of-sector,the array output data are transformed to beamspace.Then,the generalized likelihood ratio test is derived in beamspace.The simulation results show that the method can detect the passive weak targets efficiently under the background of strong interference,and provide the constant false alarm rate(CFAR) detection.关键词：acoustic signal processing;signal detection;interference suppression;acoustic vector sensor array;beamspace transformation;CFAR3|2|2更新时间：2025-07-16
- 摘要：In this paper,a novel three-pole varactor-tuned bandpass filter using mixed microstrip combline and quasi-combline resonators biased by only two voltages is proposed.The couplings between mixed combline resonators can be controlled so that the constant bandwidth requirement could be satisfied,and the design theory is analyzed based on odd- and even- mode method in detail.The tunable filter has an almost constant 3-dB absolute bandwidth of 104.5 ± 8MHz from 1.0GHz to 1.78GHz.Its insertion loss varies from 5.7 dB to 4.2 dB with its return loss better than 16dB.By using dissimilar resonators,the rejection level at second harmonic is more than 60 dB.The measured results of the fabricated filter show good agreement with the simulated ones.关键词：three-pole tunable filters;microstrip bandpass filters;mixed combline resonators;odd- and even-mode method;varactor-tuned;constant absolute bandwidth.2|2|4更新时间：2025-07-16
- 摘要：Constacyclic codes are a kind of important error-correcting codes.In view of the factorization of (xn－1) in F2[x],the minimal generating set of (1+λu) constacyclic codes with an arbitrary length N over the ring R=F2+uF2+u2F2 are investigated,where λ is a unit of the ring R.Based on the analysis of the equivalence between cyclic codes and constacyclic codes over the ring R,the generator polynomials and minimal generating set of (1+u2) constacyclic codes with odd length are obtained,so are the codes with length N≡2(mod 4).关键词：cyclic codes;constacyclic codes;the minimal generating set;generator polynomials2|2|2更新时间：2025-07-16
- 摘要：A novel variable transformation is presented to smooth and eliminate the singularity of the retarded potential (scalar and vector potential) and the curl of the vector potential by variable substitution.So the convolution between any regular time basis function and retarded potential (or its curl)can be calculated quickly and accurately using the numerical integration method,the advantage is that it can be used in the MOT algorithm of the time-domain field integral equations,no matter how the time basis functions are.Compared to the analytical time convolution method,this numerical integration method can accurately and quickly calculate the impedance matrix elements of MOT algorithm with any type of time basis functions and different time-step,and as several numerical results will demonstrate,this novel numerical method can largely improve the accuracy and the stability of the MOT algorithm.关键词：time-domain integral equations (TDIE);marching-on-in time (MOT) algorithm;late-time instability2|2|0更新时间：2025-07-16
- 摘要：For single-channel linear mixture of high-order modulated signals which have the fixed frame length and sync code,a frequency offset estimation(FOE) algorithmbased on the maximum likelihood criterion is proposed when the two signals are coded asynchronously,and the effective range of FOE is given.FOE is calculated byoptimising the objective function,which is obtained from cross-correlation computation,and the optimised process is accomplished by utilising hierarchical search.To evaluate the performance of the proposed algorithm,Cramer-Rao Bound (CRB)of mixed-signal FOE is derived.Simulation results show that,the estimation performance of the algorithm can come close to CRB performance with low Eb/N0.The proposed algorithm is also applied to the FOE of a mixed signal whose power is asymmetrical.关键词：single-channel mixed signals;high-order modulation;frequency offset estimation;maximum likelihood estimation;Cramer-Rao Bound2|2|8更新时间：2025-07-16
- 摘要：Pseudorandom sequences with good randomness properties are widely used in stream ciphers and communications.This paper introduces one new class of generalized cyclotomic sequences of order two and length pqr, then calculates the linear complexity and the minimal polynomial of these sequences.The results show that the new cyclotomic sequences have high linear complexity.关键词：generalized cyclotomic sequences;linear complexity;minimal polynomial2|2|1更新时间：2025-07-16
- 摘要：In small quantum network,the security of communication information can be guaranteed physically by the application of quantum teleportation,the noise of quantum channel will be bound to interfere with the communication information,leading to the error of code.In order to guarantee the reliability of information communication,a routing protocol of small quantum network is proposed based on quantum error correcting code.According to the routing characteristics of small quantum network,corresponding routing tables are made.On the basis of these routing tables,quantum teleportation can be realized from source quantum node to the nodes within one-hop or two-hop.Correct the errors of code resulting from noise of quantum channel based on error correcting code theory,and handle it accordingly,to ensure the reliability of communication information at data link layer.The security of the protocol is proved in theory.关键词：quantum error correction code;small quantum network;teleportation;one-hop;two-hop2|2|3更新时间：2025-07-16
- 摘要：It remains an open problem to design a secure and efficient RSA-based password-authenticated key exchange(PAKE)protocol in the areas of cryptography.In 2011,Wei proposed the first provably secure gateway-oriented PAKE protocol using RSA,and claimed that the protocol is provably secure in the random oracle model based on the intractability of the integer factorization problem.However,in this short paper,we point out that an adversary can launch the separation attack on their protocol by exploiting the oracle service unwittingly provided by the server,and a user's password can thus be guessed just after tens of malicious sessions.Our cryptanalysis result invalidates Wei's claim that their protocol can achieve the security goal of password protection,and highlights the damaging threat that separation attack poses to RSA-based PAKE protocols.Furthermore,we uncover the flaws in their formal security proof and put forward an enhancement to overcome the identified defect.The analysis results show that the improved protocol eliminates the vulnerability of Wei's protocol while keeping the merit of high performance,suitable for mobile application scenarios.关键词：gateway-oriented password authentication;RSA;random oracle model;separation attack2|3|6更新时间：2025-07-16
- 摘要：In order to improve the accuracy of bird sound recognition under non-stationary noise,a rapid bird sound recognition method using anti-noise texture features was proposed.This method also solved the problem of big occupation space,as well as large computation,time-consuming of gray level co-occurrence matrix (GLCM) in extracting texture features.The method contained three steps.Firstly,short-time spectrum estimation was conducted on noise spectrum of bird sound to get the enhanced spectrum.Then,sum and difference histograms (SDH) were applied to calculate texture features rapidly.Finally,random forest (RF) was used to make classification.In the experiment part,two contrast experiments were designed.The results show that this method has good recognition performance,lesser time consumption;meanwhile,it is robust to noise.关键词：bird sound recognition;anti-noise texture features;short-time spectrum estimation;sum and difference histograms (SDH)2|2|13更新时间：2025-07-16
- 摘要：Characters are concerned in many image processing applications.Enhance resolutions of character images frequently lead to higher recognition rate.Considering vertical,horizontal and diagonal texture features of character images,a new image smoothness measurement as well as a new method for extracting image texture in different directions is proposed,and a single-frame super-resolution (SR) reconstruction method is implemented under the maximum a posteriori (MAP) framework.Using a self-adaptive flexible template as a convolution kernel,texture information is introduced into the image prior model.Therefore,SR reconstruction is finally converted into an objective function optimization problem.Experimental results show that the proposed algorithm effectively increases the recognition rate for character images and has preferable robustness to noise.关键词：image reconstruction;super resolution (SR);maximum a posteriori (MAP);texture analysis;character recognition2|3|9更新时间：2025-07-16
- 摘要：The FDR-LBP (Principal Direction Rotation Local Binary Pattern) features are presented to describe rotation face in image plane.We add rotation offset value for forming rotation LBP features based on arbitrary neighborhood LBP feature and then train a rotation face classifier by Adaboost algorithm.We use the classifier to detect the region of rotation face and then verify the result.A new principal direction algorithm is presented for calculating the angle of face rotation,with the angle to normalize the rotation face.The experiment results indicate that the new method can detect faces under all degree rotation in image plane with high speed,the detection rate is 94% and the normalization difference is below 6 degree.It can satisfy face detection system requirements of all degree rotation detection,with high detection rate and low normalization difference.关键词：computer application;LBP;Adaboost;face detection;face normalization2|2|4更新时间：2025-07-16
- 摘要：This paper presents an improvement to a four-component model-based decomposition scheme of polarimetric synthetic aperture radar (SAR) images for oriented urban buildings.Techniques to discriminate the ambiguity between oriented buildings and vegetation are proposed.First,phase rotation (PR) of the coherency matrix after orientation angle compensation (OAC) is derived to minimize the cross-polarization component.Second,an alternative volume scattering model with a criterion for pure randomness scatterers and/or oriented dihedral structures is introduced in the proposed decomposition.Finally,power constraints are appended to the scheme to prevent negative powers.It is shown that the oriented urban buildings are well distinguished as double bounce objects from vegetation areas compared to those from the existing four component decompositions and the negative powers are eliminated.关键词：polarimetric synthetic aperture radar (SAR);four-component decomposition;oriented buildings;volume scattering model;phase rotation (PR);orientation angle compensation (OAC)2|2|6更新时间：2025-07-16
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