海杂波的非线性测试

时间序列的非线性检测对于非线性时间序列分析、混沌特性研究有着重要意义。讨论了时间序列的几种非线性检测方法,将代理数据产生方法中的IAAFT方法与冗余方法结合起来,对实测海杂波数据进行非线性检测。对测试结果进行分析,表明海杂波是由非线性系统产生的,应该采用非线性处理方法研究海杂波。     

一种人防警报集中控制系统的可靠连接策略

人防警报系统的控制网络是整个系统的重要组成部分，也是最为脆弱的部分，控制网络的失败会直接导致整个系统的失败。为了提高系统控制中心和警报终端连接的可靠性，该文提出了一种建立在单一控制网络基础上的通信机制，分别以GPRS和PSTN这2种控制网络实现控制中心对警报终端的控制，引入了冗余技术，把基于这2种控制网络的控制方式无缝地整合在一起，当一个控制网络失败时，透明地切换到另一个控制网络，以减低通信失败的可能性。     

冗余技术在分布式控制系统中的应用研究

以某酒厂稻谷加工DCS控制系统为例，介绍了冗余技术在分布式控制系统中的应用，并从PLC冗余、通信冗余和软件编程三方面进行了详细的论述。     

入侵检测系统中基于变量相似性特征选择

ReliefF是一种在很多场合经常使用的filter式的特征选择方法．然而该方法的一大缺点是不能辨别冗余特征。基于ReliefF算法提出一种混合的有监督的特征选择算法。该算法首先利用ReliefF算法去除与分类无关的以及权重低于一定阈值的特征，然后采用一种变量相似性准则来去除冗余特征。在实际的数据集KDDCUP＇99上进行的实验结果表明该混合特征选择方法较单独使用ReliefF方法在分类精度上有一定的提高。     

STD容错计算机系统

本文介绍了ＳＴＤ双模容错计算机系统的结构，对其中几个关键电路作了详细叙述，并在双模容错系统的基础上构成了ＳＴＤ四模容错计算机系统，最后对这两个系统的可靠性进行了评价。     

A kinematically compatible framework for cooperative payload transport by nonholonomic mobile manipulators

In this paper, we examine the development of a kinematically compatible control framework for a modular system of wheeled mobile manipulators that can team up to cooperatively transport a common payload. Each individually autonomous mobile manipulator consists of a differentially-driven Wheeled Mobile Robot (WMR) with a mounted two degree-of-freedom (d.o.f) revolute-jointed, planar and passive manipulator arm. The composite wheeled vehicle, formed by placing a payload at the end-effectors of two (or more) such mobile manipulators, has the capability to accommodate, detect and correct both instantaneous and finite relative configuration errors. The kinematically-compatible motion-planning/control framework developed here is intended to facilitate maintenance of all kinematic (holonomic and nonholonomic) constraints within such systems. Given an arbitrary end-effector trajectory, each individual mobile-manipulator's bi-level hierarchical controller first generates a kinematically-feasible desired trajectory for the WMR base, which is then tracked by a suitable lower-level posture stabilizing controller. Two variants of system-level cooperative control schemes—leader-follower and decentralized control—are then created based on the individual mobile-manipulator control scheme. Both methods are evaluated within an implementation framework that emphasizes both virtual prototyping (VP) and hardware-in-the-loop (HIL) experimentation. Simulation and experimental results of an example of a two-module system are used to highlight the capabilities of a real-time local sensor-based controller for accommodation, detection and corection of relative formation errors.     

Optimum component switching for systems that operate and idle

Whilst the selection of optimum redundancy designs, in the presence of opposite failure modes, has received much attention in the literature, the associated problem of optimum management of such redundant systems has hitherto been ignored.This note considers the determination of the optimum switching policy for redundancy designs in terms of a cost formulation which weights each of the two failure modes and allows for a cost associated with the repeated switching of components. The integrated design and switching problem is also discussed. By considering all possible three component series — parallel systems, it is demonstrated that the optimum switching policy is critical in the determination of the optimum redundancy design.     

TTCAN冗余网络的实现机制

多条TTCAN,总线通过TTCAN耦合可组成冗余网络.其网络同步层通过对相位差的调整获得相位同步,并采用对TUR(Time Unit Ratio)的调整获得速率同步.该TTCAN冗余网络的实现包括循环时间、全局时间的相位同步、速率同步等.     

MPEG和Dolby AC-3音频码流分析软件的设计与实现

基于ISO／IEC11172-3和ATSCA／52标准,开发了数字音频流分析软件,实现了MPEG-1各层和Dolby AC-3这2类数字音频流的分析。阐述了设计和实验中遇到的一些问题及其解决方法,着重讲述了CRC原理和对2类流的不同实现方法。该软件对研究数字音频编码、检验音频流的正确性有一定的实用价值。     

捷联惯性测量组合的冗余设计和优化

讨论了捷联惯性测量组合冗余设计方案,并引入性能指标函数、系统有效度约束、系统代价函数,对冗余配置的优化问题进行了研究,寻求最优配置和优化准则.最后以5个单自由度陀螺为例,实现冗余优化配置.