机载总线网络及其发展

从当今机载电子系统对信息传递的需求出发,纵观航空电子综合化系统的发展阶段,说明为了适应新一代航空电子系统的大容量、深层次的信号与信息综合的要求,机载互连手段从较低速率的总线向宽带网络发展成为必然的趋势。介绍了光纤通道(FiberChannel,FC)、可扩展性一致性接口(ScalableCoherentInterface,SCI)以及波分复用光网络等宽带互连方案,给出它们的研究动向,说明它们作为先进综合式航空电子系统统一网络(UniversalAvionicsNetwork,UAN)的候选所具有的特点。     

近地小行星威胁与防御研究现状

近地小行星与地球碰撞虽然罕见但可能会造成灾难性后果。近年来,各国加强了对近地小行星的监控、跟踪力度,并且实施了几次卓有成效的探测任务,如何防御近地小行星威胁的研究越来越多。总结了目前近地小行星的主要观测监视设施和现状,讨论了国际上对小行星威胁的评估情况,分析和评估了目前提出的防御手段的研究现状及其可行性。     

空间目标多星多角度实时近距离三维详查研究

针对现有观测卫星近距离观测研究较少关注详查等任务特性的现状,设计分析了可实时、全覆盖、近距离观测空间目标的卫星编队构型。综合考虑绕飞相对轨道运动、传感器视场参数、旋转目标坐标转换等因素,简化了空间目标模型,将其表面进行网格离散。分析了各网格被单颗观测卫星观测的情况,统计详查覆盖率、详查最短时间,分析不同绕飞距离对任务特性的影响;设计卫星观测光轴转动策略和多星编队协同观测策略,通过数值算例分析不同策略对卫星近距离观测任务的影响。结果表明:所设计的绕飞编队观测构型可满足实时、全覆盖观测空间目标的要求,可应用于绕飞监测、协同操作等近距离空间在轨操作任务。     

大型星载固面天线热变形试验及仿真分析验证

星载天线在轨运行期间所经历的复杂温度环境,会使天线产生严重的热变形,从而对其电性能造成重要影响。文章根据大型星载固面天线热变形的特点,提出热变形试验与仿真一体化分析验证方法,并且将测试结果与数值仿真结果进行相互校验。该方法可为大型星载天线结构设计及验证提供参考。     

A method for aircraft magnetic interference compensation based on small signal model and LMS algorithm

Aeromagnetic interference could not be compensated effectively if the precision of parameters which are solved by the aircraft magnetic field model is low. In order to improve the compensation effect under this condition, a method based on small signal model and least mean square（LMS） algorithm is proposed. According to the method, the initial values of adaptive filter＇s weight vector are calculated with the solved model parameters through small signal model at first,then the small amount of direction cosine and its derivative are set as the input of the filter, and the small amount of the interference is set as the filter＇s expected vector. After that, the aircraft magnetic interference is compensated by LMS algorithm. Finally, the method is verified by simulation and experiment. The result shows that the compensation effect can be improved obviously by the LMS algorithm when original solved parameters have low precision. The method can further improve the compensation effect even if the solved parameters have high precision.     

三点法测量线轮廓度和面轮廓度的数学模型

本文通过分析和研究三点法误差分离技术,建立了测量和评定工件线轮廓度、面轮廓度的数学模型。     

改善高校贫困生成长环境研究

党的十六大提出了在未来二十年要全面建设小康社会的宏伟目标,如何实现这一目标,工作是多方面的,而高校贫困生正是人们应该关注的重点对象。本文主要从高校贫困生的消费现状、贫困生心理、国家资助体系等存在的突出问题人手调查分析贫困生目前现状,并且在前人研究成果的基础上,从国家宏观经济政策和贫困生自身方面提出相应的解决措施。     

Spectral response of Experimental Geodetic Satellite determined from high repetition rate SLR data

The design of the retroreflector array (RRA) of the fast spinning Experimental Geodetic Satellite (Ajisai) allows to determine orientation of its spin axis by means of frequency analysis. Moving spectral analysis (MSA) of the simulated Satellite Laser Ranging (SLR) data gives information about frequencies which can be obtained for the whole range of the incident angle between the laser beam vector and the spin axis of the spacecraft. This frequency signal changes as the incident laser beam crosses consecutive rings of the RRA.     

飞机用O型橡胶密封圈测绘与设计

介绍了飞机用O型橡胶密封件测绘与设计的必要性及其具体的测绘要求、测量工具和测量方法,提出了适用的O型橡胶密封件的结构尺寸设计方案。     

On early cognitive mapping

In this paper we examine the nature of theearly cognitive map – the beginnings of acognitive map formed from one's earlyimpressions of the environment one is in. Twodistinct paradigms have emerged from ourstudies of what information is initially identified in a cognitive map. The first, which weterm a space-based approach, emphasises makingexplicit the spatial extent of the currentlocal environment. The second emphasises makingexplicit the relationships between objects inthe local environment and we call this anobject-based approach. For both paradigms weexamine the psychological literature to findsupport for the approach and the roboticists'attempts at implementing the idea. We arguethat a space-based approach is the moreappropriate way to compute an early cognitivemap. In particular, we find that Siegel andWhite's (1975) object-based hypothesis, whichstates that the developmental progression of acognitive map is from landmark to route tosurvey map, is not supported. The space-basedparadigm underpins our own work in this areaand we outline our own space-based theory forcomputing an early cognitive map.