分布式干扰仿真研究

在简要分析旁瓣对消原理的基础上,通过建模与仿真对多干扰机分布式干扰对抗雷达旁瓣对消的效果进行了分析,结果表明,多干扰机分布式干扰是对抗旁瓣对消的有效技术途径.     

Reliable flight performance assessment of multirotor based on interacting multiple model particle filter and health degree

Multirotor has been applied to many military and civilian mission scenarios. From the perspective of reliability, it is difficult to ensure that multirotors do not generate hardware and software failures or performance anomalies during the flight process. These failures and anomalies may result in mission interruptions, crashes, and even threats to the lives and property of human beings. Thus, the study of flight reliability problems of multirotors is conductive to the development of the drone industry and has theoretical significance and engineering value. This paper proposes a reliable flight performance assessment method of multirotors based on an Interacting Multiple Model Particle Filter (IMMPF) algorithm and health degree as the performance indicator. First, the multirotor is modeled by the Stochastic Hybrid System (SHS) model, and the problem of reliable flight performance assessment is formulated. In order to solve the problem, the IMMPF algorithm is presented to estimate the real-time probability distribution of hybrid state of the established SHS-based multirotor model, since it can decrease estimation errors compared with the standard interacting multiple model algorithm based on extended Kalman filter. Then, the reliable flight performance is assessed with health degree based on the estimation result. Finally, a case study of a multirotor suffering from sensor anomalies is presented to validate the effectiveness of the proposed method.     

现代远程教育的媒体素材构建方法

本文阐述了媒体素材的采集及处理方法 ,对现代远程教育工程建设可提供有效的帮助     

Determination of optimal samples for robot calibration based on error similarity

Industrial robots are used for automatic drilling and riveting.The absolute position accuracy of an industrial robot is one of the key performance indexes in aircraft assembly,and can be improved through error compensation to meet aircraft assembly requirements.The achievable accuracy and the difficulty of accuracy compensation implementation are closely related to the choice of sampling points.Therefore,based on the error similarity error compensation method,a method for choosing sampling points on a uniform grid is proposed.A simulation is conducted to analyze the influence of the sample point locations on error compensation.In addition,the grid steps of the sampling points are optimized using a statistical analysis method.The method is used to generate grids and optimize the grid steps of a Kuka KR-210 robot.The experimental results show that the method for planning sampling data can be used to effectively optimize the sampling grid.After error compensation,the position accuracy of the robot meets the position accuracy requirements.     

萤火一号火星探测器星星掩星接收机设计实现

对萤火一号(YH-1)火星探测器星星掩星接收机设计实现进行了研究.给出星星掩星探测原理和设计的掩星接收机.性能和地面仿真测试结果表明:掩星接收机各项性能指标优良,灵敏度高,满足中俄联合火星电离层无线电掩星观测试验高精度的探测需求.     

太赫兹固态电子器件和电路

随着微电子技术的飞速发展,半导体器件的截止频率已经进入到太赫兹频段,太赫兹电路的频率特性特性得到极大发展。以固态器件为基础的电路的工作频率进入到太赫兹频段。太赫兹固态电子器件与电路技术在空间领域有着重要的应用前景。文章重点介绍InP基三端太赫兹固态电子器件和电路,以及太赫兹肖特基二极管器件和电路的技术发展过程与最新动态。并指出随着器件与电路的整体化与集成化发展趋势,太赫兹单片集成技术是其未来发展方向。     

变形飞行器建模及控制方法研究综述

针对变形飞行器的发展现状、气动建模、动力学建模以及控制方法研究进行了综述。首先阐述了变形飞行器的定义及变形需求,再从四个方面梳理了变形飞行器的技术优势。针对不同的机翼变形方式,对飞行器各种变形技术的特点及发展现状进行了详细的分析与总结;将变形飞行器与固定外形飞行器的气动机理进行了对比分析,并对变形飞行器的动力学建模方法进行了梳理,总结了各种方法的特点;结合变形飞行器自身特性分析了飞行控制的特点及难点,并详细阐述了各类变形飞行器的控制研究进展。最后总结分析了变形飞行器的发展趋势：深化基础理论与技术研究,从材料、结构及控制等领域全方面朝着智能化方向发展,最终实现变形飞行器的工程化、自主化、智能化应用。     

基于高效数值方法的一种高超声速飞行器外形气动力/热综合优化设计研究

基于所发展的高效气动力/热快速预测方法,建立了适用于高超声速飞行器的综合考虑气动力与气动热特性的外形优化设计技术,并在一种高超声速飞行器外形设计中应用,通过优化设计改变了初始外形纵向静不稳定特性,优化后外形实现了纵向静稳定、大攻角自配平和非驻点表面最大热流下降的设计目标。所发展的方法为适应气动外形快速选型设计需求提供了有效的途径。