行波电流天线阵的加载

天线进行加载后可使电流以行波分布，从而改善天线的综合性能。本文以两单元天线阵为基础讨论天线阵的行波加载问题，提出了确定阵单元加载量的加载公式。研究了加载量与相关参量的相互关系。数值计算表明，天线阵经加载后可保证在全方位的电扫描过程中，保持单元电流的行波分布，从而可使天线阵的系统性能得以改善。另外所导公式计算简便，避免了传统方法解决同类问题时计算量大的困难。     

利用倾斜地面降低短波天线高度

对远距离的短波通讯,在水平地面上要求天线架设得很高。在一定条件下,利用倾斜地面可以较大地降低天线高度,获得较大的经济效益。     

Search designs for 2m factorial experiments

Theorems 5, 6 and 10, and Tables 1–2 in Ghosh (1981) are corrected. These are concerned with search designs which permit the estimation of the general mean and main effects, and allow the search and estimation of one possibly unknown nonzero effect among the two- and three-factor interactions in 2^m factorial experiments. Some new results are presented.     

Constructing D-optimal symmetric stated preference discrete choice experiments

We give new constructions for DCEs in which all attributes have the same number of levels. These constructions use several combinatorial structures, such as orthogonal arrays, balanced incomplete block designs and Hadamard matrices. If we assume that only the main effects of the attributes are to be used to explain the results and that all attribute level combinations are equally attractive, we show that the constructed DCEs are D-optimal.     

An orthogonal arrays approach to robust parameter designs methodology

Robust parameter design methodology was originally introduced by Taguchi [14 Taguchi, G. 1986. Introduction to Quality Engineering: Designing Quality Into Products and Process, Tokyo: Asian Productivity Organization.  [Google Scholar]] as an engineering methodology for quality improvement of products and processes. A robust design of a system is one in which two different types of factors are varied; control factors and noise factors. Control factors are variables with levels that are adjustable, whereas noise factors are variables with levels that are hard or impossible to control during normal conditions, such as environmental conditions and raw-material properties. Robust parameter design aims at the reduction of process variation by properly selecting the levels of control factors so that the process becomes insensitive to changes in noise factors. Taguchi [14 Taguchi, G. 1986. Introduction to Quality Engineering: Designing Quality Into Products and Process, Tokyo: Asian Productivity Organization.  [Google Scholar] 15 Taguchi, G. 1987. System of Experimental Design, Vol. I and II, New York: UNIPUB.  [Google Scholar]] proposed the use of crossed arrays (inner–outer arrays) for robust parameter design. A crossed array is the cross-product of an orthogonal array (OA) involving control factors (inner array) and an OA involving noise factors (outer array). Objecting to the run size and the flexibility of crossed arrays, several authors combined control and noise factors in a single design matrix, which is called a combined array, instead of crossed arrays. In this framework, we present the use of OAs in Taguchi's methodology as a useful tool for designing robust parameter designs with economical run size.     

Orthogonal Arrays for the Estimation of Global Sensitivity Indices Based on ANOVA High-Dimensional Model Representation

We present an efficient new approach to estimate global sensitivity indices based on ANOVA high-dimensional model representation. The method makes use of the properties of orthogonal arrays and extend the results of Wang et al. (2010 Wang , X. , Tang , Y. , Chen , X. , Zhang , Y. ( 2010 ). Design of experiment in global sensitivity analysis based on ANOVA high-dimensional model representation . Communications in Statistics—Simulation and Computation 39 : 1183 – 1195 .[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]) to a more general situation. A theorem is given to illustrate that both the non influential and significant sensitivity indices are well estimated. This new method offers higher sampling efficiency than those of Sobol and Saltelli. We test its performance on two different models, which are widely used in engineering and statistical areas.     

阵列测向系统中模型误差的校正方法

在阵列测向问题中，模型误差是新型体制实用化的主要障碍之一。模型误差的校正可分为已知校正源校正和自校正两种类型。本文在现有的理论基础上，提出了几种具有实用价值的方法，并讨论了这些方法在实际系统的应用，给出了系统实验结果。     

计入阵元间互耦影响的阵列方向图综合

现有的通过控制旁瓣电平综合天线阵方向图的诸多方法中均无法计入阵元间互耦的影响，本文首先将天线阵等效成多端口网络，计入了阵元间互耦的影响，然后把所要综合方向图的阵列假设成自适应阵列，最后基于自适应阵列理论提出了一种可计入阵元间互耦影响的阵列方向图综合方法。     

一维逻辑门排列及布线程序

本文介绍了一个能实现一维逻辑门排列及布线的新程序。此程序命名为 POLGAR,用 FORTRAN 77编写,并已在采用 UNIX 操作系统的准32位微机DUAL 83/20上成功运行。经各种实例检验,证明该程序能够产生接近最佳的解。     

高分辨阵列测向的全局优化自校正算法

提出了一种高分辨阵列测向的全局优化自校正算法。对在模型失配的情况下,利用投影矩阵所形成的谱估计矩阵,同时对信号的到达方向及未知的模型误差参数进行估计,并利用退火模拟算法保证算法能收敛于全局最优解。为简单起见,文中仅考虑阵元的增益及相位误差参数。