ACCELERATION AMBIGUITY FUNCTION OF RADAR SIGNALS AND ITS APPLICATION

High acceleration of radar targets is analyzed using Acceleration Ambiguity Function(AAF). The acceleration resolution based on AAF is defined. The AAF and acceleration resolution of rectangle pulse signal are derivated and the conclusion that its acceleration resolution is in inverse proportion with the square of its duration is drawn. In the end, these conclusions are applied to the parameter designing and performance evaluation for a certain type of pulse Doppler radar.     

鱼雷静不稳定状态下纵向三回路过载控制与仿真研究

静不稳定控制技术作为现代航空航天、水中兵器主动控制技术,在近些年逐渐成为研究热点。本文针对某静不稳定鱼雷,建立了纵向运动模型,运用最优控制理论设计了俯仰通道三回路过载控制系统,最后对设计出的控制器进行了特征点控制系统仿真。结果说明,三回路过载控制方法能较好地控制静不稳定鱼雷。     

基于GPS和加速度感应器的组合车辆定位系统研究

GPS位置信号的获取是城市智能交通系统中的一个基础问题,为解决城市中由于建筑物遮挡或信号反射造成GPS信号误差大或根本无法获取GPS信号的问题,设计一种基于GPS接收设备和采用加速度感应器进行航位推导的组合车辆定位系统。     

一种脚部加速度信息获取系统的设计与实现

提出了一种新颖的脚部加速度信息获取方法,并利用嵌入式低功耗技术和无线数据传输技术,成功研制了一套试验系统。试验结果表明,本系统具有较高的数据采样速率和良好的无线数据传输性能,能实现脚部三维加速度信息的精确获取。本系统为进行基于脚部加速度信息的相关研究提供了重要的试验平台,具有重要的基础意义。     

基于T-S模糊神经网络的涡扇发动机加速控制

航空发动机足一个结构复杂的非线性强多变量控制对象。随着航空发动机全权限数字式电子控制器的研制和应用,发动机加速性能要求的不断提高,对发动机加强智能控制技术的应用是必然的趋势。因此将智能控制引入到航空发动机控制系统中,根据模糊控制与神经网络结合的思想,针对涡扇发动机加速控制中的最优控制问题,提出了基于T—S（Tagaki—Sugeno）模型的模糊神经网络的发动机加速控制,并对控制系统的结构、网络结构进行仿真实现。仿真结果表明方法在满足发动机加速控制中各约束条件的前提下,不喘振、不超温、使发动机加速过程安全稳定,且加速时间短。     

基于硬件加速的几何失真校正研究

分析研究一种新的图形硬件架构CUDA,基于其类C语言硬件开发环境和多线程的硬件执行机制,实现了基于GPU的几何失真校正的数学贴图映射,并根据像素分辨率的不同情况分别进行了实验验证,证明该方法比基于CPU的实现具有更高的场景交互速度,保证了视景系统的真实感和实时性.     

连铸结晶器振动在线监测系统的研制

在连铸生产过程中,为了精确调节结晶器振动参数、提高钢坯质量,利用加速度信号的双重积分获得结晶器振动参数的方法,研制了连铸结晶器实时在线监测系统。该系统实现了对结晶器振动性能指标的自动检测。试验及现场应用表明,该监测系统可对结晶器产生偏振以及不按照非正弦规律振动等现象进行精确监测,能够满足连铸生产现场的监测要求。     

FAST: acceleration from theory to practice

Fast acceleration of symbolic transition systems (Fast) is a tool for the analysis of systems manipulating unbounded integer variables. We check safety properties by computing the reachability set of the system under study. Even if this reachability set is not necessarily recursive, we use innovative techniques, namely symbolic representation, acceleration and circuit selection, to increase convergence. Fast has proved to perform very well on case studies. This paper describes the tool, from the underlying theory to the architecture choices. Finally, Fast capabilities are compared with those of other tools. A range of case studies from the literature is investigated. This paper is mainly based on results presented at CAV 2003, TACAS 2004 and ATVA 2005.     

The vibration characteristics of chain saws and their influence on vibration white finger disease

The vibration from chain saws can cause vibration-induced white finger disease (VWFD). Measurements of vibration levels on the front and rear handles of different chain saw-types, and on the operator's middle finger were collected at three logging camps on Vancouver Island. Factors effecting the vibration levels on the finger and handles were investigated. The acceleration at the firing frequency was found to be the dominant factor effecting handle and finger vibration. Other factors which were investigated were: grip force; the presence of handle covers; and chain sharpening procedure. Weighted acceleration levels are calculated and this information is used to assess the latency period for fallers to develop VWF disease.     

证券宽带卫星通信系统关键技术应用

本文主要阐述用于传送证券交易数据的宽带卫星系统(Linkstar)的关键技术。介绍了在带宽分配管理技术、网络安全性技术应用、TCP加速技术、服务质量保证(QOS)及VLAN虚拟专网技术应用等方面所做的应用研究。