检索结果-南通市图书馆

Progress in Natural Science:Materials International 2002年第1期 71-74页

作者： SHANG Yong, wu shunjun and XIANG Haige( Department of Electronics, Peking University, Beijing 100871, China key laboratory of radar signal processing, Xidian University, Xi'an 710071, China) Department of Electronics，Peking University，Beijing 100871，China key laboratory of radar signal processing，Xidian University，Xi'an 710071，China key laboratory of radar signal processing，Xidian University，Xi'an 710071，China Department of Electronics，Peking University，Beijing 100871，China

A novel parallel pipelined least-mean-square algorithm is proposed by introducing parallel processing into the pipelined least-mean-square algorithm. The algorithm presented in this paper has smaller pipelined delay, higher data throughput rate and faster convergence speed, as well as wider step size range in which the convergence behavior of the algorithm is maintained than the pipelined least-mean-square algorithm. It also exhibits some de-correlation effect for the correlated input sequence. These properties make it more suitable for the cases of higher order filter with faster convergence speed. In addition, it can also be used to simplify the hardware implementation of filters.

关键词： parallel processing adaptive filtering parallel pipelined least-mean-square algorithm performance analysis.

A novel STAP method for the detection of fast air moving targets from high speed platform

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2012年第6期55卷 1259-1269页

作者： wu RenBiao 1,2,JIA QiongQiong 1 & LI Hai 1 1 Tianjin key laboratory for Advanced signal processing,Civil Aviation University of China,Tianjin 300300,China 2 Intelligent Information Institute of ATR lab,Shenzhen University,Shenzhen 518060,China 1. Tianjin key laboratory for Advanced signal processing Civil Aviation University of China Tianjin 300300 China2. Intelligent Information Institute of ATR Lab Shenzhen University Shenzhen 518060 China

Space-time adaptive processing (STAP) is an effective method for detecting moving target in airborne/spaceborne ***,the detection of fast air moving targets from high speed platform is challenged by the range walk of both the clutter and moving *** is well known that keystone formatting can be used to compensate for the range walk of multiple moving targets simultaneously without using the knowledge of the motion ***,in the presence of serious Doppler ambiguity of fast air moving targets,distribution of the clutter will be affected by the keystone formatting matched to the ambiguity number of targets,and as a result the STAP performance will *** this paper,a novel STAP method is proposed for the detection of fast air moving targets from high speed platform,which can deal with the range walk of both clutter and *** of the new method is verified via simulation examples.

关键词： airborne/spaceborne radar keystone formatting space-time adaptive processing (STAP) moving target detection

JOINTLY ESTIMATING BOTH RANGE AND DOA OF NEAR FIELD SOURCE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2004年第2期21卷 104-109页

作者： wuYuntao DongYi LiaoGuisheng keylabofradarsignalprocessing XidianUniversityXi＇an710071

A computationally efficient method for jointly estimating both Directions Of Arrival (DOA) and ranges of near field sources is presented. The proposed algorithm does not need any spectral peak searching and the 2-D parameters are automatically paired. It is suitable for arbitrary additive Gaussian noise environment. Furthermore, its performances are confirmed by computer simulations.

关键词： Near field source DOA estimate Range estimate Fourth-order cumulant

在线全文

学校读者我要写书评

暂无评论

舰载雷达天线测角误差分析

系统仿真学报 2009年第15期21卷 4607-4612页

作者：董玫张守宏吴向东赵永波西安电子科技大学雷达信号处理重点实验室西安710071

为了分析舰船姿态角对雷达测角误差的影响,根据舰船姿态角与目标空间位置的三维立体关系,建立误差模型的量化公式。利用坐标系中Z轴指向的变化分析测角误差变化的新思路,得出偏航角不影响误差的变化,俯仰角与方位角误差曲线变化的趋势相... 详细信息

为了分析舰船姿态角对雷达测角误差的影响,根据舰船姿态角与目标空间位置的三维立体关系,建立误差模型的量化公式。利用坐标系中Z轴指向的变化分析测角误差变化的新思路,得出偏航角不影响误差的变化,俯仰角与方位角误差曲线变化的趋势相反,测角误差的最大值可以预测的结论。计算机仿真结果验证了结论的正确性。

关键词：舰载雷达姿态角空间模型误差分析

A New Variable Step-size EASI Algorithm Based on Mutual Information

在线全文

学校读者我要写书评

暂无评论

A New Variable Step-size EASI Algorithm Based on Mutual Info...

PROPAGATOR BASED CLOSED-FORM BLIND CARRIER FREQUENCY OFFSET ESTIMATION FOR OFDM SYSTEMS

2008 9th International Conference on signal processing(ICSP’2008)

作者： Haifeng Ren 1 Qingyan Shi 1 2 Renbiao wu 1 1.Tianjin key lab for Advanced signal processing Civil Aviation University of China Tianjin 300300 P.R.China 2.national key laboratory for radar signal processing Xidian University Xi’an 710071 P.R.China

In view of slow convergence for fixed-step Equivariant Adaptive Separation for Independent（EASI）algorithm and the problem for variable stepsize algorithm which bases on kurtosis is sensitive to outlier,a new variable step-size EASI algorithm is proposed,which applys the negative entropy maximization method of non-polynomial functions to the approximate calculation of the mutual *** results show that the proposed algorithm not only achieves faster convergence and smaller stead-state error than fixed-step EASI and other variable step-size algorithms,but also demonstrate better stability for the problem of outlier.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2006年第1期23卷 121-123页

作者： Li Jun Liao Guisheng wu Yuntao key lab for radar signal processing Xidian Univ. Xi＇an 710071 China Integrated Digital System lab Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China

Most of the blind Orthogonal Frequency Division Multiplexing (OFDM) Carrier Frequency Offset (CFO) estimators necessitate large number of samples to ensure the estimation accuracy. However, the number of samples can not be selected too large because of the carrier offset drift. In this letter, a new closed form algorithm for blind OFDM CFO estimation in frequency-selective channel is proposed. This method utilizes the propagator obtained from data matrix and the diagonal loading technique, thus it has better performance even only using one or two OFDM blocks. Furthermore, the range of the CFO estimation which can be handled is overall transmission spectral. Simulation results confirm its effectiveness.

关键词： Orthogonal Frequency Division Multiplexing (OFDM) Carrier Frequency Offset (CFO) Propagator Diagonal loading

REVIEW OF REDUCED RANK SPACE-TIME ADAPTIVE processing FOR AIRBORNE radarS

在线全文

学校读者我要写书评

暂无评论

REVIEW OF REDUCED RANK SPACE-TIME ADAPTIVE PROCESSING FOR AI...

基于数据共轭重排修正的传播算子DOA估计算法

1996 CIE International Conference of radar(ICR’96)

作者： Bao Zheng wu shunjun Liao Guisheng Xu Zhiyong key laboratory for radar signal processing Xidian University

ISBN: (纸本)0780329147

＜正＞This paper overviews reduced rank space-time adaptive processing（STAP）for clutter suppression in airborne early warning（AEW）radars.A new hybrid low dimensional STAP（HSTAP）approach without high implementation cost is also discussed via assigning the number of system’s degrees of freedom（DOFs）between spatial and temporal domain reasonably. The clutter rejection performance of HSTAP method is superior to the conventional cascaded space-time processing （CST）,which is verified by computer simulations.

关键词： radar clutter interference suppression adaptive signal processing radar signal processing military aircraft airborne radar radar detection reviews reduced rank space-time adaptive processing airborne radar clutter suppression airborne early warning radars AEW radars hybrid low dimensional STAP HSTAP implementation cost system degrees of freedom spatial domain temporal domain clutter rejection performance

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

系统仿真学报 2004年第8期16卷 1662-1664页

作者：张光斌廖桂生吴云韬王万林西安电子科技大学雷达信号处理重点实验室西安710071

将数据共轭重排的方法引申到传播算子算法中,提出了修正的传播算子DOA估计算法。从理论上论证了这种引申的合理性,通过理论分析和数值仿真,证明该算法在快拍数有限的情况下,可明显提高信号DOA估计的性能。在不增加运算量的条件下算法性... 详细信息

将数据共轭重排的方法引申到传播算子算法中,提出了修正的传播算子DOA估计算法。从理论上论证了这种引申的合理性,通过理论分析和数值仿真,证明该算法在快拍数有限的情况下,可明显提高信号DOA估计的性能。在不增加运算量的条件下算法性能优于MUSIC算法。

关键词：数据共轭重排传播算子算法修正传播算子算法方位估计

COMPUTATIONALLY EFFICIENT ESPRIT METHOD FOR DIRECTION FINDING

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2007年第5期24卷 655-661页

作者： Bao Zhiqiang wu shunjun Zhang Linrang national lab of radar signal processing Xidian Univ. Xi＇an 710071 China

In this paper,a low complexity ESPRIT algorithm based on power method and Orthogo- nal-triangular (QR) decomposition is presented for direction finding,which does not require a priori knowledge of source number and the predetermined threshold (separates the signal and noise ei- gen-values).Firstly,according to the estimation of noise subspace obtained by the power method,a novel source number detection method without eigen-decomposition is proposed based on QR de- ***,the eigenvectors of signal subspace can be determined according to Q matrix and then the directions of signals could be computed by the ESPRIT *** determine the source number and subspace,the computation complexity of the proposed algorithm is approximated as (2log_2 n+2.67)M^3,where n is the power of covariance matrix and M is the number of array ele- *** with the Single Vector Decomposition (SVD) based algorithm,it has a substantial computational saving with the approximation *** simulation results demonstrate its effectiveness and robustness.

关键词： ESPRIT Direction Of Arrival (DOA) Array signal processing Source number detection Power method