自调节模拟低通滤波器的研究

通过对有源低通滤波器，频率／电压转换器AD650及其变容二极管的特性分析，提出由信号频率来自调节有源低通滤波器截止频率的新设计方案，并对其可行性进行了分析和研究。     

半实物仿真在水声对抗中的实现方法探讨

对半实物仿真如何应用于水声对抗进行了阐述,介绍了半实物仿真的实现原理、数学模型的建立、仿真对抗平台的搭建以及水声对抗效能评估的方法.并对目前的难点和重点进行了剖析,同时对未来该领域的发展方向提出了自己的看法.     

空间环境对聚合物基复合材料性能的影响分析

文章介绍了空间飞行器工作过程中的空间环境条件。为满足这些要求 ,在设计与选材时须考虑一些因素。此外对某型号任务中使用的P75S/环氧 6 48复合材料耐空间环境条件的性能做了简要评述     

可视化系统建模语言及其在MIS开发中的应用

介绍了VSML(Visual System Modeling Language)的描述内容及其原语定义和行为描述,并对新完善的数据库信息处理功能进行了介绍;接着对完善后的VSML的体系结构及其功能进行了较详细的描述;然后以商业管理采购员订货系统模型作为实例,介绍了VSML的应用,最后对VSML及其进一步的研究工作进行了小结.     

Source investigation of impulsive He-rich particle events

We have investigated the source characteristic and coronal magnetic field structure of six impulsive solar energetic particle (SEP) events selected from Wang et al. [Wang, Y.-M., Pick, M., Mason, G.M. Coronal holes, jets, and the origin of ³He-rich particle events. ApJ 639, 495, 2006] and Pick et al. [Pick, M., Mason, G.M., Wang, Y.-M., Tan, C., Wang, L. Solar source regions for ³He-rich solar energetic particle events identified using imaging radio, optical, and energetic particle observations. ApJ 648, 1247, 2006]. Some results are obtained: first, 2 events are associated with wide (≈100°) CMEs (hereafter wide CME events), another 4 events are associated with narrow (?40°) CMEs (hereafter narrow CME events); second, the coronal magnetic field configuration of narrow CME events appear more simple than that of the wide CME events; third, the photospheric magnetic field evolutions of all these events show new emergence of fluxes, while one case also shows magnetic flux cancellation; fourth, the EUV jets usually occurred very close to the footpoint of the magnetic field loop, while meter type III bursts occurred near or at the top of the loop and higher than EUV jets. Furthermore, the heights of type III bursts are estimated from the result of the coronal magnetic field extrapolations.     

A novel autonomous self-assembly distributed swarm flying robot

Swarm intelligence embodied by many species such as ants and bees has inspired scholars in swarm robotic researches. This paper presents a novel autonomous self-assembly distributed swarm flying robot-DSFR, which can drive on the ground, autonomously accomplish self-assembly and then fly in the air coordinately. Mechanical and electrical designs of a DSFR module, as well as the kinematics and dynamics analysis, are specifically investigated. Meanwhile, this paper brings forward a generalized adjacency matrix to describe configurations of DSFR structures. Also, the distributed flight control model is established for vertical taking-off and horizontal hovering, which can be applied to control of DSFR systems with arbitrary configurations. Finally, some experiments are carried out to testify and validate the DSFR design, the autonomous self-assembly strategy and the distributed flight control laws.     

快响SAR卫星零多普勒波束中心姿态机动策略研究

传统偏航牵引方法采用惯性系下卫星轨道6要素推导得出姿态机动参数,在此方法中仅控制卫星主轴方向多普勒频率为0Hz,无法补偿SAR天线安装偏差和波束在天线内的方位距离向离轴角引起的斜距偏差和多普勒频率偏移,不能满足SAR系统时序设计需求和快响SAR卫星在轨实时处理器性能要求。因此,提出了地心固定坐标系中SAR天线波束指向零多普勒面内目标方向的姿态机动策略,使快响SAR卫星在轨实际波束中心多普勒频率为0Hz。该策略首先计算了基于场景目标的SAR总体设计的精确时序参数和观测参数,然后在地心固定坐标系中建立了波束中心多普勒频率为0Hz的SAR天线波束三轴指向模型,推导得出卫星三轴指向和姿态机动参数,并通过Matlab对该策略进行了仿真验证。结果表明,该策略可将多普勒频率由地球自转引起的29kHz、天线与卫星安装偏差引起的360Hz和波束方位向离轴角引起的3950Hz补偿至0Hz,同时将由天线与卫星安装偏差和波束距离向离轴角综合引起的波束中心偏离目标的斜距偏差6.28km补偿至米的量级。     

ARINC429技术在激光陀螺惯测组合中的应用研究

介绍了激光陀螺惯测组合中用到的ARINC4 2 9总线技术 ,提出了相应的接口设计方法