Combination of Loosely and Compactly Coupled Integrations of CAD Tools and Its Applications In SAW D

ＣｏｍｂｉｎａｔｉｏｎｏｆＬｏｏｓｅｌｙａｎｄＣｏｍｐａｃｔｌｙＣｏｕｐｌｅｄＩｎｔｅｇｒａｔｉｏｎｓｏｆＣＡＤＴｏｏｌｓａｎｄＩｔｓＡｐｐｌｉｃａｔｉｏｎｓＩｎＳＡＷＤｅｖｉｃｅｓＤｅｓｉｇｎａｎｄＦａｂｒｉｃａｔｉｏｎＰｅｉｇａｎｇＬｉ；Ｊｉａｑ...     

A Method of Polydirectional Fuzzy Synthetical Cluster of Considering Partiality of Decision Maker

ＡＭｅｔｈｏｄｏｆＰｏｌｙｄｉｒｅｃｔｉｏｎａｌＦｕｚｚｙＳｙｎｔｈｅｔｉｃａｌＣｌｕｓｔｅｒｏｆＣｏｎｓｉｄｅｒｉｎｇＰａｒｔｉａｌｉｔｙｏｆＤｅｃｉｓｉｏｎＭａｋｅｒ￥ＬＵＺｏｎｇｈｕａ；ＹＡＯＬａｉｃｈａｎｇ（ＳｈａｎｄｏｎｇＩｎｓｔｉｔｕｔｅ...     

The Application of GTD to the Design of Chokes Horn

ＴｈｅＡｐｐｌｉｃａｔｉｏｎｏｆＧＴＤｔｏｔｈｅＤｅｓｉｇｎｏｆＣｈｏｋｅｓＨｏｒｎＳｕＤｏｎｇｌｉｎ；ＸｉｅＹｕｌａｎ；ａｎｄＬｕＳｈａｎｗｅｉ（Ｐ．Ｏ．Ｂｏｘ２０５，ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＡｅｒｏｎａｕｔｉｃｓａｎｄＡｓｔｒｏｎａ...     

A Simulant Model of Development of Animal Husbandry and Application

ＡＳｉｍｕｌａｎｔＭｏｄｅｌｏｆＤｅｖｅｌｏｐｍｅｎｔｏｆＡｎｉｍａｌＨｕｓｂａｎｄｒｙａｎｄＡｐｐｌｉｃａｔｉｏｎＨＥＣｈａｎｇｚｈｅｎｇ；ＸＵＪｉｕｐｉｎｇ；ＬＩＵＧｕａｎｇｚｈｏｎｇ（Ｄｅｐｔ．ｏｆＡｐｐｌｉｅｄＭａｔｈｅｍａｔｉｃｓ，Ｃｈｅｎ...     

Application of Fuzzy Mathematics in the Evaluation of Textbooks in institutions of Higher Learning

ＡｐｐｌｉｃａｔｉｏｎｏｆＦｕｚｚｙＭａｔｈｅｍａｔｉｃｓｉｎｔｈｅＥｖａｌｕａｔｉｏｎｏｆＴｅｘｔｂｏｏｋｓｉｎｉｎｓｔｉｔｕｔｉｏｎｓｏｆＨｉｇｈｅｒＬｅａｒｎｉｎｇ￥ＬＩＪｉａｎｎｉｎｇ；ＹＡＮＸｉａｎｍｉｎｇ（ｓｈａｎｘｉＵｎｉｖｅｒｓｉｔｙ...     

A Theoretical Research on the System of Regional Development Models

ＡＴｈｅｏｒｅｔｉｃａｌＲｅｓｅａｒｃｈｏｎｔｈｅＳｙｓｔｅｍｏｆＲｅｇｉｏｎａｌＤｅｖｅｌｏｐｍｅｎｔＭｏｄｅｌｓＱＩＮＹａｏｃｈｅｎ；ＺＨＡＯＢｉｎｇｄｏｎｇ；ＹＵＡＮＺｈｏｎｇｊｉｎＨｅｎａｎＵｎｉｖｅｒｓｉｔｙ，Ｋａｉｆｅｎｇ４７５００１，Ｐ...     

Research of Decision System Analysis for Decision Support

ＲｅｓｅａｒｃｈｏｆＤｅｃｉｓｉｏｎＳｙｓｔｅｍＡｎａｌｙｓｉｓｆｏｒＤｅｃｉｓｉｏｎＳｕｐｐｏｒｔＲｅｓｅａｒｃｈｏｆＤｅｃｉｓｉｏｎＳｙｓｔｅｍＡｎａｌｙｓｉｓｆｏｒＤｅｃｉｓｉｏｎＳｕｐｐｏｒｔ￥ＬＩＵＳｈａｏｊｕｎ；ＨＡＮＣｈｏｎｇｈａｏａｎ...     

The Implementation Technology of a Model Description and Management Tools of Comprehensive Information

ＴｈｅＩｍｐｌｅｍｅｎｔａｔｉｏｎＴｅｃｈｎｏｌｏｇｙｏｆａＭｏｄｅｌＤｅｓｃｒｉｐｔｉｏｎａｎｄＭａｎａｇｅｍｅｎｔＴｏｏｌｓｏｆＣｏｍｐｒｅｈｅｎｓｉｖｅＩｎｆｏｒｍａｔｉｏｎＷＡＮＧＳｈｉｐｉｎｇ；ＸＩＡｎｂａｎｇ（ＭａｎａｇｅｍｅｎｔＳｃｈｏ...     

The Analysis and Numerical Simulation of Dynamical Functions of the Transpiration Cooling Control System with Surface Ablation

ＴｈｅＡｎａｌｙｓｉｓａｎｄＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎｏｆＤｙｎａｍｉｃａｌＦｕｎｃｔｉｏｎｓｏｆｔｈｅＴｒａｎｓｐｉｒａｔｉｏｎＣｏｏｌｉｎｇＣｏｎｔｒｏｌＳｙｓｔｅｍｗｉｔｈＳｕｒｆａｃｅＡｂｌａｔｉｏｎＸｕＹａｎｈｏｕ；ＷｕＧｕａｎ...     

Research for the Algorithm of Nonlinear Two Stage Least Squares Estimator

ＲｅｓｅａｒｃｈｆｏｒｔｈｅＡｌｇｏｒｉｔｈｍｏｆＮｏｎｌｉｎｅａｒＴｗｏＳｔａｇｅＬｅａｓｔＳｑｕａｒｅｓＥｓｔｉｍａｔｏｒＺＨＯＮＧＤｅｎｇｈｕａ；ＷＡＮＧＲｅｎｃｈａｏ；ＬＩＵＢａｏ；ＺＨＡＮＧＳｈｉｙｉｎｇ（ＴｉａｎｊｉｎＵｎｉｖｅｒｓｉｔｙ...     

Unification and Comparison between Two Concepts of Radar Target Angular Glint

This paper provides a general proof of unification between two concepts of radar target angular glint. The analysis of a two-point target model, consisting of a electrically and a magnetically ideal dipole, shows the relation, difference and equivalent condition between them more clearly. Angular glint has been synthesized from the measured data of radar echo phase, and compared with the theoretical result.     

基于频率捷变和RCS加权抑制雷达角闪烁的研究

角闪烁是雷达目标后向散射特性的重要物理量，它能严重降低毫米波末制导雷达的导引精度。介绍了一种利用RCS和角闪烁之间的相关性抑制角闪烁的RCS加权方法。为实现这一方法，采用了频率捷变技术来获取目标回波信号的多个独立样本。仿真结果显示，经过4至5个脉冲的处理，角闪烁的均方根线偏差从5m～6m降至不到1m。     

再论扩展目标的角闪烁

解释了角闪烁的两种物理概念及其计算方法;从数学上证明了远区角闪烁线偏差与雷达距离无关;以两个任意取向的电偶极子组成的典型目标为例,推导了考虑目标回波极化和接收天线极化时的角闪烁理论计算公式。理论分析和数值计算表明,在几何光学条件近似下,对线极化接收,相位梯度法与坡印亭矢量法完全等效。     

从极化的观点讨论复杂目标角闪烁的计算方法

从极化的观点出发讨论了复杂目标角闪烁的两种计算方法。基于电磁散射理论推导了考虑接收天线极化时PVM计算复杂目标角闪烁的一般公式;对采用PGM计算角闪烁提出了一种不需要进行"相位伸直"处理的算法;利用PGM和PVM计算和比较了不同接收极化下几种典型复杂目标的角闪烁线偏差,对基于组合偶极子模型获得的PGM和PVM的等效条件给出了一般性的数值证明。     

Comparison between two concepts of angular glint:general considerations

Angular glint can be interpreted as a distortion of the radar echo signal phase front, or alternatively, a tilt of the direction of energy flow from the radial direction. As the complementarities and support of argumentation in our previous work, a general discussion about two concepts of angular glint is made based on electromagnetic theory to demonstrate that these two concepts are equivalent when geometrical optics approximation is used and＇ the receiving antenna is linearly polarized.     

比相单脉冲雷达目标角闪烁建模与仿真

探讨了复杂目标的多点模型建模问题，给出了采用相位梯度法计算模型进行角闪烁仿真的结果，并与比相单脉冲雷达的真实测角偏差进行了比较，指出比相单脉冲雷达所测角同角闪烁存在区别，通过分析二者之间的联系，提出用比相单脉冲雷达和、差通道回波计算角闪烁的方法。     

多表面阻抗加载凸导体柱的电磁散射

飞行器隐身技术之一是阻抗加载。本文研究充电大尺寸(ka=10)任意截面多表面阻抗加载凸导体柱的电磁散射。问题的反应积分方程是采用组合Fock理论和矩量法的混合方法建立,并由Leontovich阻抗边界条件来求解的。对一个多表面阻抗加载圆柱体的混合法的数值分析表明,利用多表面阻抗加载,可实现较大角范围内后向雷达散射截面(RCS)的减缩,并同时产生后向散射相位的强烈跃变,从而获得大的角闪烁线偏差,这是一种新的隐蔽技术措施。     

粗糙面上方二维目标角闪烁特性分析

此前角闪烁特性的研究对象多为偶极子或自由空间中的典型目标,而海、地粗糙面环境中雷达目标角闪烁特性研究的需求更为迫切。采用矩量法与矩阵UV分解相结合(method of moments with the UV, MOM-UV)的快速计算方法,仿真求得PM谱粗糙面及其上方二维目标的各成分感应电流。再利用相位梯度法得到复合散射角闪烁线偏差的精确计算结果,并进一步分析各成分感应电流对角闪烁的贡献,探究耦合对于目标角闪烁特性的影响。     

粒子滤波和多站TOA的外辐射源雷达跟踪方法

针对外辐射源雷达跟踪常采用扩展卡尔曼滤波（extended Kalman filter,EKF）算法导致其跟踪精度受闪烁噪声影响较大的问题,结合到达时间（time of arrival,TOA）定位技术和粒子滤波（particle filter,PF）算法,提出一种适于闪烁噪声环境的外辐射源雷达跟踪方法。该方法通过多站TOA获得测量信息,利用双基地角来减弱目标雷达散射截面积（radar cross section,RCS）闪烁,采用非线性和非高斯的PF进行跟踪,能减小因闪烁噪声而导致的跟踪误差,避免EKF算法因线性化而带来的误差,从而提高跟踪精度。实验表明,该方法的跟踪性能优于EKF,尤其受闪烁噪声影响小,能提高闪烁噪声环境下的跟踪精度。实测数据验证了该方法的有效性。     

A New Stealth Technique for Vehicles Based on the Enhancement of Angular Glint

A general 2-D problem of electromagnetic scattering from a multiple cavity-backed longitudinally loaded slotted perfectly conducting cylinder with arbitrary cross section is formulated. The formulation is used to account for the scattered field from the scale models, for which, a series of experiments has been conducted in an anechoic chamber. Quite good agreement between theory and experiment is obtained. The analysis of the experimental results near resonant frequency shows that the reduction of backscattering radar cross section over wide aspect angles, and the dominant enhancement of target angular glint (linear deviation) can be achieved by impedance loading such as multiple cavity-backed slots, which realizes a new stealth technique for vehicles.