中央维护系统概念及其应用

二十世纪八十年代以来,国外航空界研制开发了民用直升机的健康与使用状况监控系统(HUMS),并将这一概念引入军机,先后建立了用于军用直升机的联合先进飞机健康与使用状况监控系统(JAHUMS)项目和用于歼击机的故障预测与健康管理(PHM)项目,本文基于当前国外HUMS的发展状况,借鉴JAHUMS和PHM的构想,将HUMS概念引入到民用固定翼飞机中央维护系统(CMS)中,对CMS概念、应用和其关键技术进行了初步探讨。     

计及不确定性因素的结合面参数识别

结合面参数识别是复杂结构动力学建模的关键问题。由于连接结构的接触面的大小、摩擦系数，以及安装预应力等相关参数存在不确定性，本文提出把连接结构的接触刚度及接触阻尼作为随机分布参数处理，并使用基于响应面法的模型修正方法和分布代数方法进行识别，方法可行，便于实际工程应用。研究表明，连接结构参数具有正态分布或近似正态分布的特点；用线性有限元模型加上具有正态分布的接触刚度、接触阻尼模型可以描述真实结构的动态特性。     

大规模高速背板的信号完整性设计与仿真

本文首先从联合战术无线电系统的规模分析了设计大规模高速背板的必性,同时从信号完整性方面分析了高速背板设计中所面临的问题,包括反射、串扰、损耗与衰减、电源完整性等几个方面的机理及对PCB设计造成的不良影响,并针对这几个信号完整性问题给出了相应的PCB设计准则。其次,针对一款基于串行RapidlO高速总线的背板系统从PCB设计的层叠设计、布线设计、过孔设计等方面给出具体分析与设计方案。最后,通过Sigrity公司的PowerSI仿真软件、Synopsys公司的Hspice仿真软件和Quantum公司的QSI仿真软件进行信号完整性仿真和Ansofl公司的Siwave5．0仿真软件进行电源完整性仿真,通过仿真分析对PCB信号完整性进行验证与设计优化。     

The standoff observation of enemy ground forces from Project Peekto JointSTARS-A prolusion

The author describes the evolution of JointSTARS. In particular he outlines three series of events that led to JointSTARS-an Army, an Air Force and a Joint one. Amongst the topics discussed are: Mohawk SLAR system; ALARM/SOTAS; MLRS3/MARS; and Assault Breaker and Pave Mover     

飞机装配型架接头定位器的自动设计

接头定位器是现代飞机装配型架上最为常用的定位元件。为了简化接头定位器的设计过程,提高设计质量和效率,在FixCAD系统研制的基础上提出并开展了接头定位器自动设计技术的研究和开发。内容包括:(1)在分析接头定位器结构及其设计特点的基础上,提出并建立接头定位器的结构模型和设计模型;(2)研究接头定位器设计的知识和经验细节,建立可计算的推理原则和参数关系式;(3)基于接头定位器的结构模型、设计模型和设计知识,构建接头定位器的自动设计算法,以及应用该算法开发"典型接头定位器自动设计"模块。     

JTIDS链路性能分析与仿真

从链路层的角度出发,介绍了美军联合信息分发系统(JTIDS)的技术体制;并对其传输性能进行了分析;在用SPW软件建立的系统的链路仿真平台上,系统在不同条件下,例如高斯白噪声、多网干扰、点频及部分频带干扰以及非理想同步,对误码性能进行了仿真测试;最后,还对JTIDS系统的抗干扰能力进行了评估。     

Open system concepts for modular avionics

Advanced communications, guidance and navigation systems play key roles in determining superiority of one combat aircraft over another. The use of advanced technology is essential to meeting the mission requirements of present as well as future aircraft. Modular avionics are being used in next generation aircraft, such as the Air Force F-22 fighter and the Army Comanche helicopter, as the means of achieving higher levels of performance, including reduced volume and improved adaptability, maintainability, and expandability. New system acquisitions such as Joint Strike Fighter will attempt to achieve these same performance levels but at dramatically reduced life cycle cost. Retrofit applications will also take on increasing roles in meeting this affordability need as the Department of Defense (DoD) struggles to maintain readiness in the face of the shrinking defense budget. The government is encouraging the use of open standards practices as a means of addressing the affordability issue. The Open Systems Joint Task Force (OS-JTF), formed in September 1994, is chartered to “sponsor and accelerate the adoption of open systems in weapons systems and subsystem electronics to reduce life-cycle costs and facilitate effective weapon system intra- and interoperability”. The purpose of this paper is to relate the concept of open systems to modular avionics. It discusses the key attributes of an open systems approach and identifies key technologies necessary for its success     

Joint STARS phased array radar antenna

The Joint STARS phased array radar system is capable of performing long range airborne surveillance and was used during the Persian Gulf war on two E8-A aircraft to fly many around-the-clock missions to monitor the Kuwait and Iraq battlefield from a safe distance behind the front lines. This paper is a follow-on to previous publications on the subject of the Joint STARS antenna and deals mainly with mission performance and technical aspects not previously covered. Radar data of troop movements and armament installations are presented, a brief review of the antenna design is given, followed by technical discussions concerning the three-port interferometry, gain and sidelobe design approach, cost control, range test implementation and future improvements     

联合优化的BP神经网络模型的应用研究

BP算法因收敛速度慢、易于陷入局部极小值等缺点，使得对于较大的搜索空间、多峰值和不可微函数常常不能搜索到全局极小点，这些制约了BP网络在各个领域中的应用。本文通过对学习系数、神经元的激励函数及误差函数的联合优化，在一定程度上避免了学习中的局部极小问题，提高了学习效率，改进了网络的性能。     

Spectrum for the Seventies and Beyond

Radio frequency spectrum management for the 1970's is discussed, with the role of IEEE's Joint Technical Advisory Committee defined.     

Testing the precision lightweight GPS receiver

Innovative field testing techniques are employed at Holloman Air Force Base to help the Global Positioning System (GPS) NAVSTAR Joint Program Office (JPO) test the Precision Lightweight GPS Receiver (PLGR). Characterizing the PLGR's accuracy in dynamic environments is of prime importance but testing also prescribes the evaluation of its ability to receive differential GPS corrections, real time, and its Electronic Counter Counter Measures. To meet these goals, the 46th Test Group provides the C-12 cargo aircraft for flight testing, an instrumented test van for mobile testing, the High Speed Test Track for high velocity testing, a UH-1 helicopter for rotor blade modulation testing, and special PC laptops for ground troop testing. All of these test capabilities utilize Holloman's well instrumented test environments with thousands of surveyed sites validated by the Defense Mapping Agency. This paper emphasizes the testing techniques that are helping to define Test & Evaluation methodologies for the changing world where Global Positioning with NAVSTAR is becoming a reality     

A modular approach to digital networks for fourth-generationavionics

To support the Joint Advanced Strike Technology (JAST) baseline architecture, advanced avionic systems will need to be modular in nature and support open commercial standards. System issues affecting these modules are discussed and the performance of existing and planned demonstration hardware is described     

空海一体战的演变

介绍了美军“空海一体战”产生的背景及其作战场景，分析了“空海一体战”这一概念的演变。2015年初，美国国防部决定将“空海一体战”更名为“全球公域介入与机动联合”概念。新概念反映出的最明显变化是美军为应对反介入/区域拒止（A2/AD）挑战，将对陆、海、空、天、电五大作战空间的战力进行集成，这打破了作战空间的局限性，更多强调的是全军联合、互操作的概念，同时新名称从称呼上模糊了作战构想的针对性。最后探讨了针对这一演变的应对策略。     

不同金属材料的扩散接合

扩散接合就是在适当的温度和压力下，使相互接触两金属表面间的氧化膜破裂，实现各元素在接合过程中相互扩散，从而达到接合目的。其接合强度与接合面积、原子结合强度有关。接合后存在残余应力起因于材料的热膨胀系数。     

CLUSTER MISSION OPERATIONS

The Cluster ground segment design and mission operations concept have been defined according to the basic mission requirements, namely, to allow the transfer of the four spacecraft from the initial geostationary transfer orbit achieved at separation from the launcher into the final highly elliptical polar orbits, such that in the areas of scientific interest along their orbits, the four spacecraft will form a tetrahedral configuration with pre-defined separation distances, to be changed every six months during the mission. The Cluster mission operations will be carried out by ESA from its European Space Operations Centre; the task of merging the Principal Investigators' requests into coordinated, regular scientific mission planning inputs to ESOC will be undertaken by the Joint Science Operations Centre. The mission products will be distributed to the scientific community regularly in form of CD-ROMs. Principal Investigators will also have access to quick-look science, housekeeping telemetry and auxiliary data via an electronic network.     

THE JOINT SCIENCE OPERATIONS CENTRE

The Joint Science Operations Centre (JSOC) has been established to provide the operational interface between the Instrument Principal Investigators (PIs) and the European Space Operations Centre (ESOC). Its key task will be to merge inputs from the Cluster instrument teams and to generate the coordinated command schedule for operation of the scientific payload. In addition, it will collect and process data needed to plan those operations and will monitor the performance of the mission and individual instruments. This paper outlines the JSOC subsystems that have been built to carry out these tasks and highlights points of scientific or technical interest within these systems.     

基于INS/JTIDS组合的JTIDS相对导航

简要地介绍了联合战术信息分发系统(JTIDS)的相对导航原理,分析了低动态用户相对导航卡尔曼滤波算法对于高动态用户的局限性。在 INS/JTIDS 组合导航的基础上,探讨了 JTIDS的相对导航。     

JMASS环境下的飞行仿真组件集成研究

简要介绍了联合建模与仿真系统(JMASS)的基本概念,分析了JMASS的结构和组成。进一步以一个飞行仿真组件的集成为实例,阐述了如何进行基于JMASS仿真环境的仿真子系统开发,特别研究了如何给已有仿真组件增加设计专门针对JMASS环境而的接口的技术,使现有组件能够顺利集成到JMASS环境下,并使之正确运行。     

Is there an alternative to the Joint Strike Fighter? - I

The large financial commitments which several countries are making towards the future Joint Strike Fighter of the USA begs the question of whether there is an alternative to satisfy the needs of European Air Forces. After having recalled the post-War evolutions of the European fighter market, described the present state and the future prospects, the present article attempts to outline an answer.