编译优化对浮点运算正确性影响的分析研究

针对Microsoft Visual C 程序的浮点运算的正确性问题,进行了底层分析研究,给出了剖析结论:提出了编译优化影响浮点运算正确性问题的解决对策及其实现方法:同时提出了程序设计者为提高软件的可靠度,应特别关注会影响浮点运算正确性的几种情况。     

捷联式导航计算机的最优NiosⅡ构建

从导航计算机实时性和时间可确定性的要求出发,结合niosⅡ的高度灵活性和可定制性的特点,设计了完全可控式双NiosⅡ处理器,实现了IEEE-754标准单浮点精度的cordic算法,并添加了硬件浮点运算的用户指令。最终的NiosⅡ系统非常适合捷联导航解算,是低成本、高性能的捷联式导航计算机的最佳选择。     

一种新型基于VXI总线的导弹惯性平台自动测试系统

VXI总线作为一种新型的模块化测量仪器标准总线，适用于航空航天领域，包括各种导弹的测试，文章通过对某型导弹惯性平台测试系统现状的分析，提出基于VXI总线组建导弹平台自动化测试系统的理想方案。并对在IEEE－1394环境下用VXI总线标准组建导弹惯性平台自动化测试系统进行了较详细的论述。     

AS5643总线优化传输方法研究

针对AS5643总线传输等时数据包时所带来的不确定性问题,提出一种将总线周期分为等时和异步两部分时隙的优化传输方法,能在不影响确定性的前提下引入等时数据包传输;首先对引起不确定性问题的原因进行了分析,然后详细介绍了优化传输方法的原理及工程实现;该优化传输方法经实验证明是正确可行的,可应用于高度综合化的航空电子系统中。     

A computational algorithm based on biogeography-based optimization method for computing power system security constrains with multi FACTS devices

A major role is played by the analysis of power system security in heightening system security and in system collapse condition avoidance. This article presents a cutting edge mechanism which is devised applying transmission line loadings as well as variance in bus voltage magnitude. The use of flexible alternating current transmission systems devices improves the objectives of generation fuel charges in addition to the severity index proposed which were investigated considering the contingency circumstances of generator(s) or/and transmission channel(s). To boost system security in spite of contingency circumstances in the existence of unified power flow controller or UPFC, it would be most appropriate to pinpoint a most advantageous position to install aforementioned device. We propose a model of UPFC where power insertion is done by using voltage source. Also a procedure to incorporate the same and a strategy to find optimum position has been proposed which uses line overload sensitivity indices. This work mainly focused on establishment of available transfer capability on the heavily congested line. The proposed congestion management scheme alleviates the heavy stress in transmission line and provides an ample corridor for the power to flow. Biogeography-based optimization or BBO in short, is a technique which is a growing recognized optimization method which has been lucratively engaged in solving intricate optimization problem in dissimilar fields. The BBO provides better results than the metaheuristic counter parts such as Genetic Algorithm and Particle Swarm Optimization. The effectiveness of proposed BBO has been tested on standard IEEE 30 bus system and the results are compared with classic methods and other metaheuristic methods. This is established through the MATLAB package. Improved bus voltage profile was also attained and it can be inferred from the outcome that the prospective approach can drastically enhance security of power system when comparing with other optimization methods.     

基于EMC传导发射测量的光传输系统

介绍了一种适用于EMC测试中传导发射测量的光导传输系统及该系统射频信号的光传输技术.采用组合式的选择电路和衰减电路,通过系统IEEE-488总线控制输入通道选择以及大范围的增益调节.为灵活测量和分析远距离电磁环境中复杂电平提供了较好的传输路径.     

单精度浮点加法器的FPGA实现

在FPGA上实现单精度浮点加法器的设计,通过分析实数的IEEE 754表示形式和IEEE 754单精度浮点的存储格式,设计出一种适合在FPGA上实现单精度浮点加法运算的算法处理流程,依据此算法处理流程划分的各个处理模块便于流水设计的实现.所以这里所介绍的单精度浮点加法器具有很强的运算处理能力.     

电厂数据采集系统与接口电路

数据采集是当前工业控制中应用非常广泛的一种技术,通过对数据采集系统的原理、构成的介绍并结合电厂应用的实例,以接口电路的设计为例,对其具体的实现进行了说明。     

基于并行预测的前导零预测电路设计

前导零预测电路是提高浮点加法器运算速度的一个重要手段,本文提出了一种适用于高速浮点加法器的前导零预测电路.它采用了独特的并行预测算法来分别预测做浮点减法运算时结果为正和为负的两种情况下的前导零数,再通过尾数运算结果的进位来判断运算结果的正负并对前导零预测的结果进行选择.该方法使得浮点减法运算前无需比较尾数的大小,且并行的预测算法共用部分逻辑电路,从而使加法器在运算速度提高的基础上降低了加法器的面积.最终的验证结果表明该方法正确有效.     

IEEE-1394标准接口及应用

IEEE-1394标准接口具有良好的物理特性,十分适合数字视音频数据的传输,它的出现为民用和专业市场,创造了一个很容易得到的高性价比的全数字化拍摄至制作的环境。目前已广泛应用在数字视音频消费市场,随着技术的发展和普及,它将成为极为重要的数字接口。