共查询到20条相似文献,搜索用时 46 毫秒
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李冬霞 《中国民航学院学报》2005,23(Z1):45-46
结合雷达情报报文特征,借助软件复用设计思想,提出了基于文本描述语言、可扩展标识语言以及基于高级程序设计语言3种报文处理系统的设计方案,并就其特性分别进行了阐述.3种设计方案均体现了报文处理系统的可扩展性、可复用性以及可靠性. 相似文献
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分析了波分复用(WDM)光纤通信的工作原理和应用特点,重点分析了目前研究中的超密集波分复用(UDWDM)光纤通信中的光源波长稳定技术、复用/去复用技术、掺铒光纤放大器(EDFA)和光纤的性能改善技术等关键技术. 相似文献
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本文介绍了光纤通信系统的原理和组成,并结合大唐光纤通信系统在贵.阳空管中心的应用,重点介绍了系统维护维修中的一些体会。 相似文献
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本文从MIS软件程序结构的一般特点,论述了以通用程序模块为基本部件的模块复用技术对软件开发的影响。无论采用那种软件开发方法。这一技术作为软件设计阶段的基本手段之一,对于提高软件质量和开发效率,促进软件开发的规范化、程序化、自动化和软件的商品化都是切实可行的。 相似文献
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在论述光传操纵系统发展背景和工作原理的基础上,简要介绍了时分复用光传操纵系统和波分复用光传操纵系统两大类别,进一步提出了光纤多路发送软件、接收软件的设计问题。在详尽阐述余度技术的基础上,提出了典型光传操纵系统三余度设计方案及其实现。实例验证表明,光传操纵系统及其余度技术具有普通电传操纵系统无可比拟的优点,必将在今后的航空领域中得到广泛的应用。 相似文献
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基于UML构件分析的软件复用技术 总被引:1,自引:1,他引:1
软件复用是提高软件生产力和软件质量的重要途径。本文主要介绍了用面向对象的UML方法来分析构件,并从中提取可复用构件,进而将其封装为EJB构件的开发流程。为快速、高效地构建系统提供了一种可行的解决方案。 相似文献
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Slaveski F. Sluss J. Jr. Atiquzzaman M. Nguyen H. Ngo D. 《Aerospace and Electronic Systems Magazine, IEEE》2003,18(8):3-8
During flight, aircraft avionics transmit and receive RF signals to/from antennas over coaxial cables. As the density and complexity of onboard avionics increases, the electromagnetic interference (EMI) environment degrades proportionately, leading to decreasing signal-to-noise ratios (SNRs) and potential safety concerns. The coaxial cables are inherently lossy, limiting the RF signal bandwidth while adding considerable weight. To overcome these limitations, we have investigated a fiber optic communications link for aircraft that utilizes wavelength division multiplexing (WDM) to support the simultaneous transmission of multiple signals (including RF) over a single optical fiber. Optical fiber has many advantages over coaxial cable, particularly lower loss, greater bandwidth, and immunity to EMI. In this paper, we demonstrate that WDM can be successfully used to transmit multiple RF signals over a single optical fiber with no appreciable signal degradation. We investigate the transmission of FM and AM analog modulated signals, as well as FSK digital modulated signals, over a fiber optic link (FOL) employing WDM. We present measurements of power loss, delay, SNR, carrier-to-noise ratio (CNR), total harmonic distortion (THD), and bit error rate (BER). Our experimental results indicate that WDM is a fiber optic technology suitable for avionics applications. 相似文献
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在信息大爆炸的今天,人们对信息的需求日益强烈,我们每天都接收和处理着大量的信息,而移动技术的出现使我们接收和处理信息更加便捷和高效。"信息改变世界,移动改变生活"这句广告词形象的描绘出了我们的生活已经随着移动技术的出现而发生了改变。 相似文献
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Jian-Guo Zhang 《Aerospace and Electronic Systems Magazine, IEEE》1999,14(6):15-21
With applications of systems integration technology to advanced aircrafts, high-speed and high-capacity optical fiber communication networks should be employed to support airborne broadband communication services. To guarantee real-time multiuser communications over a network, the selection of medium-access schemes is critical for avionics applications. In this paper, we briefly discuss the issues on high-speed multiple-access techniques and their applicability. Then we focus on the design and operation aspects of avionic optical fiber code-division multiple access (CDMA) networks. Some practical considerations on implementing such a CDMA network are also addressed and further improvement is pointed out. It is shown that avionic optical fiber CDMA networks can find a use in real-time avionic sensor data distribution, data exchange, and computer interconnects 相似文献
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曾几何时,人们津津乐道"轻点鼠标,足不出户,在互联网上购买机票。"的惬意,而现在航空运输服务搭上了3G技术和iPhone手机的顺风车,一路高歌地将其"航空模式"的服务再推向一个极致的高峰,并将改变目前的航空运输服务规则。 相似文献
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九寨黄龙机场的新技术应用——运行条件复杂机场的出路 总被引:1,自引:0,他引:1
九寨黄龙机场是国内运行条件最复杂的机场之一,也是旅客吞吐量最大的高高原机场。在民航局的支持下,机场引进和使用了大量新技术,不仅降低了机场建设难度,改善了机场的适航性,提高了机场安全保障能力,而且还提高了机场和航空公司的运行效益。一、机场的环境状况及运行中存在的主要问题1.环境状况九寨机场地处青藏高原南麓,周围被群山环抱,并处于印度暖气流和北方 相似文献
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Military avionics optical fiber data buses of high reliability are discussed. Because Light Emitting Diodes (LED's) have better temperature performance and require less complex driver circuits than laser diodes, the former is normally chosen as an optical source in the severe aircraft environment at present. In this case, optical power budget becomes a critical factor which can significantly limit the number of terminals in a data bus. To effectively solve this problem while maintaining a high reliability, we present several configurations of all-active couplers and hybrid passive/active couplers for avionics optical fiber data buses using PIN photodiodes and LED's. The system design is also described, which incorporates a modulation scheme called partial trilevel Manchester II bi-phase coding 相似文献
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水陆两栖飞机的关键技术和产业应用前景 总被引:1,自引:2,他引:1
水陆两栖飞机历经百年的发展,已成为飞机大家族中的稀有机型,但其在现代航空工业中的存在价值和意义却不容忽视,其独特的水陆起降特性更使其依然具有在民用和军事多个领域中应用的优势。除了陆基飞机常规的设计制造技术外,水陆两栖飞机特有的关键技术则是其优良水面起降特性的技术保障,也是航空技术发展的一个重要方面。本文从传统布局和现代创新布局两个方面阐释了水陆两栖飞机的设计特点和技术特征以及发展转变,从水陆两栖飞机水动力特性和气动特性等方面分析了影响其发展的关键技术,并探讨了水陆两栖飞机的产业应用领域前景以及技术发展方向。 相似文献
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Jian-Guo Zhang 《Aerospace and Electronic Systems Magazine, IEEE》1998,13(10):25-32
In this paper, several design issues on highly reliable MIL-STD-1773 (or 1553B) optical fiber avionics data buses are investigated. Two optical modulation techniques are proposed for avionics data buses, and they can be used to efficiently solve the problems associated with the fast identification of correct operation states for optical transmitters while maintaining less complexity of transceivers. The implementation of the proposed techniques is discussed. We also deal with the selection of optical devices and fibers to improve the reliability and power budget of optical fiber avionics data buses. Furthermore, some future improvements on avionics data bus systems are pointed out 相似文献
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随着我国航空航天领域器械的飞速发展,对该领域中结构件所用材料的综合性能及轻量化提出了新的要求。在过去几十年里,大型客机的市场需求不断扩大,刺激了新型材料的兴起,使材料向着高性能,轻质量发展。纤维金属层板是由铝合金与纤维预浸料交替铺层固化而成的层间混杂复合材料。纤维金属层板结合了金属与复合材料的优良特性,具有密度小、损伤容限优良、抗冲击和疲劳性能,越来越受到航天航空和轨道交通领域的关注。目前用于商业生产的金属纤维层压板(FMLs)多以基于芳纶纤维(ARALL)与基于高强玻璃纤维(GLARE)的层板为主。概括了纤维金属层板的制备前表面处理工艺,对其弯曲测试、拉伸测试、冲击测试和疲劳测试等力学性能的测试方法进行综述,同时对未来新型纤维金属层板的开发进行探究,为纤维金属层板的开发提供参考信息。 相似文献