基于增广矩阵束方法的平面天线阵列综合

针对平面阵列的稀布优化问题,提出了一种基于增广矩阵束方法的减少阵元数目、求解阵元位置和设计幅度激励的优化方法。首先对期望平面阵的方向图进行采样并由采样点数据构造增广矩阵,对此矩阵进行奇异值(SVD)分解,确定在误差允许范围内所需的最小阵元数目;然后基于广义特征值分解分别计算两组特征值,并根据类ESPRIT算法对特征值进行配对;最后在最小二乘准则条件下根据正确的特征值对求解平面阵列的阵元位置和激励。仿真结果表明该算法具有较高的计算效率和数值精度。     

Origin-shifted algorithm for matrix eigenvalues

In this paper an origin-shifted algorithm for matrix eigenvalues based on Frobenius-like form of matrix and the quasi-Routh array for polynomial stability is given. First, using Householder's transformations, a general matrix A is reduced to upper Hessenberg form. Secondly, with scaling strategy, the origin-shifted Hessenberg matrices are reduced to the Frobenius-like forms. Thirdly, using quasi-Routh array, the Frobenius-like matrices are determined whether they are stable. Finally, we get the approximate eigenvalues of A with the largest real-part. All the eigenvalues of A are obtained with matrix deflation. The algorithm is numerically stable. In the algorithm, we describe the errors of eigenvalues using two quantities, shifted-accuracy and satisfactory-threshold. The results of numerical tests compared with QR algorithm show that the origin-shifted algorithm is fiducial and efficient for all the eigenvalues of general matrix or for all the roots of polynomial.     

Array automata and operations on array languages

Array automata acting on scenes (two dimensional tapes) are defined. The set of scenes accepted by array automata are proved to be equivalent to the set of arrays generated by array grammars. Certain operators like substitution, homomorphic replication and insertion are extended to sets of arrays. These operators yield interesting classes of pictures.     

Parallel permutation generation on linear array

Given n items, a parallel algorithm for generating all the n! permutations is presented. The computational model used is a linear array which consists of n identical processing elements with a simple structure. One permutation is produced at each other time step. The elapsed time to produce a permutation is independent of the integer n. The basic idea used is the iterative method and the exchange of two consecutive components in an existing permutation. The design procedures of this algorithm are considered in detail. The ranking and unranking functions of the required permutations are also discussed.     

FPGA的动力电池检测系统研究

为提高动力电池使用效率,提出了一种基于FPGA的动力电池检测系统的设计方案.采用AD转换芯片实现对电池电压、电流的采集,数字温度传感器对温度进行采集,再通过软件实现对数据的处理和实时显示.系统运行稳定,数据处理能力强,集成度高,易于扩展.     

平面式电容传感器阵列激励模式研究

由于非金属复合材料及其内部不同损伤具有不同介电特性,采用平面式电容传感器阵列可实现无损可视化检测。针对平面式阵列电极结构,研究不同激励模式对复合材料内部缺陷检测效果影响。提出单激励、双激励和奇偶激励3种激励模式,对比分析各种激励模式下传感器信号强度、探测深度等性能差异。结果表明:奇偶激励模式在信号测量和成像质量方面都优于前2种模式。同时也验证了基于电容敏感机理的平面电容传感器阵列对复合材料内部缺陷检测的可行性和有效性。     

基于弹载存储系统的便携式读数盒设计及应用

当发射试验结束后,为了对飞行体数据存储器中的数据进行回收,提出了基于FPGA的便携式读数盒的电路设计及控制逻辑设计。在简要介绍数据存储系统的同时,详细阐述了读数盒在弹载存储器数据回收模式中的应用、读数盒的硬件设计以及FPGA的控制逻辑设计。实践证明,该设计实现了飞行体对硬回收存储器中数据的可靠读取和回收,满足工程实践要求。     

可重构阵列的同步性能优化算法

可重构多处理器阵列上的容错技术可用来重构含有故障单元的处理器阵列,以便获得最大可用的目标阵列。现有的研究成果主要侧重于重构算法的构造,还没有涉及对重构后目标阵列的同步通讯性能的研究。提出了一种改善目标阵列同步通讯性能的电路优化算法,用来降低目标阵列行与行之间通讯的延时,使得相邻两行处理器的通讯尽可能达到同步。实验结果表明,提出的算法对不同大小、不同故障率的阵列都有相应的同步通讯性能的改善。     

双（多）基地声纳浮标系统在反潜中的应用研究

在双基地声纳系统中，根据能量关系推导出双基地声纳系统最大可探测范围的数学模型；在此基础上，讨论了用双（多）基地声纳浮标系统布放直线阵、圆形阵时的阵形宽度、搜索面积及所需浮标数，并将之与传统被动浮标阵进行了比较．结果表明：采用双（多）基地浮标阵可以在一定程度上节省浮标数，提高了浮标的使用效率．     

Development of a Reconfigurable Platform for Manufacturing Equipment Control

In modern manufacturing equipment control area,controller is required to deliver higher computing capability for adopting advanced algorithms to meet speed and accuracy requirements,and reconfigurabilities for changing or(and)adding features or functions.This paper presents a methodology in design and implementation of a high performance and reconfigurable platform for manufacturing equipment control.This methodology is in virtue of system on a programmable chip(SoPC)technolo- gy but replacing the on-chip processor by an external high performance,floating-point digital signal processor(DSP).The appli- cation of the DSP is designed as a multi-threaded framework,which has more flexibilities than a traditional single-loop one.Fur- thermore,the field programmable gate array(FPGA)system can be reconfigured easily and quickly to meet a new requirement by dragging and dropping pre-built components in a SoPC building environment.As a result,the controller platform is more recon- figurable in terms of algorithms and functions.This platform is implemented in a 3-axis milling machine control and the result indicates that the design and implementation presented in this paper is feasible.