基于虚拟仪器技术的多路水声信号同步采集及处理平台设计

本文介绍了虚拟仪器技术在水声信号处理研究中的一个具体应用,利用LabVIEW语言编程,在NI公司高速数据采集硬件平台上实现了高采样率下多通道数据的同步采集、处理、记录功能,并在不使用信号处理机的情况下,利用主控单板机的单核CPU完成了32通道常规波束成形(CBF)的实时计算。同时,本文对非DSP硬件平台的实时信号处理实现方法进行了初步的研究。     

高空平台无线通信系统设计

针对当前快速发展的高空平台无线通信系统,对其系统的原理、构成和技术特点进行简要介绍。在系统设计中分析了其信道模型,指出在低频段可以借鉴陆地移动通信的Okumura-Hata模型进行链路损耗预计;对空中交换体制进行了选择,提出了地空通信中抗多径衰落工程方法,抗多普勒频移的技术途径;实现了空中通信设备中信道模块、共用平台的小型化设计。对高空平台无线通信系统的发展方向进行了展望。     

机载平台式惯导系统导电环故障机理分析及解决措施

导电环是平台式惯导系统惯性平台的重要组成部分,主要承担惯性平台台体内各种信号与系统的传输和交联,导电环发生故障直接会导致惯导系统失效。针对导电环三种故障模式:接触电阻变大、绝缘强度降低以及烧坏,本文采用微动磨损和电接触理论,结合作者的实际工作经验,对故障机理进行了分析,提出了相应的改进措施。这些措施均在生产中得到落实。落实措施后的故障统计表明,采取的改进措施有效,导电环的故障率与原来相比降低了38%。     

基于慕课的“信号与系统”教学实践

针对本校电子信息类专业学生普遍认为“信号与系统”学习难度大的现状，开展了基于慕课的教学改革。就某些教学难点，探讨了对于数理基础较弱学生的教学，改进措施包括借鉴精品慕课资源、回顾高数和复变函数等知识点和线上线下协同教学。教学实践表明，学生对信号表示、系统分析涉及的物理概念理解更加透彻，学习兴趣增加。     

基于.NET平台的Word数据自动交换管理技术应用

基于.N ET的Word自动化解决方案为企业自动化应用提供了基础平台,本文分析了解决方案的对象模型技术,并对几个常用的Word对象的原理进行了详细介绍,并用实例对其使用方法进行了说明,这对实现Word数据管理自动化具有一定的指导意义。     

多媒体数据库管理系统的设计和开发

讲述了一个多媒体数据库管理系统的开发过程及其功能特点。重点介绍了如何在多媒体创作平台Autherware中应用数据库技术和ActiveX控件技术．并给出了相关的源代码。     

Iridium and Rhodium as Permanent Chemical Modifiers for the Determination of Ag, As, Bi, Cd, and Sb by Electrothermal Atomic Absorption Spectrometry

Performance of graphite platforms coated with Ir, Rh, and a mixture of both, as permanent modifiers for Ag, As, Bi, Cd, and Sb, was evaluated. The coating process is very simple: a solution containing Ir, Rh, or a mixture of both is pipetted on the platform inserted in a graphite tube, and this is submitted to a temperature program. High pyrolysis temperatures are allowed, especially for As and Bi, 1400°C, in the Ir + Rh-coated platform. The sensitivity remains about the same for all analytes with different coatings, except for As in the Ir-coated platform, for which a remarkable gain was obtained in comparison to the other coatings. The lifetimes of the treated tubes were in the range 50 to more than 1000 cycles, being especially long for Sb and Ag in the Rh-coated platform, more than 600 and 1000 cycles, respectively. The Rh coating could not be used for Bi and Cd. Analysis of a certified reference water and of acid oyster tissue digests showed the absence of interference and good precision. Advantages of the permanent coatings are the possibility of low blanks byin situcleaning of the modifier and shorter analysis time.     

Preliminary Flight Test Program on Telecom and Broadcasting Using High Altitude Platform Stations

Telecommunication and broadcasting systems using radio-relay/base stations on board the high altitude platforms are expected to create the largest business market among its possible applications. They could also be integrated with satellite- and terrestrial-based systems in the future to construct the more powerful mobile and/or broadband networks. Prototype onboard equipment and ground equipment are being developed on schedule in the fixed, mobile, and broadcasting services. The performance of them will be demonstrated and evaluated in the preliminary flight tests planned in 2002 using alternative aerial vehicles: a helicopter, a jet, and a solar-powered unmanned aerial vehicle (UAV), before flight tests using the high altitude airships. This paper presents activity in Japan on the R&D of wireless access systems using high altitude platform stations and the detail of the preliminary flight test program. This revised version was published online in July 2006 with corrections to the Cover Date.     

舰载雷达稳定转台传动系统的误差分析

介绍了某型雷达稳定转台传动装置原理，分析在传动系统中的各类主要误差及回差，并提出处理和控制的有效方法，实现了传动精度的提高。     

基于Web Services的移动通信综合网管系统

基于Web Services分布式原理，提出了一种新的移动通信综合网管系统的方案．该系统与目前国内传统的TMN网管系统相比，在匹配性、移植性、扩展性、安全性以及重用性等方面都具有明显的优越性．通过对Web Services体系结构分析研究，给出了Web Services到TMN网管系统的映射．并在试验环境中，实现和验证了这种基于Web Services分布式综合网管系统．最后对如何用，ETWeb服务来实现综合的网管的关键技术进行了阐述和分析。