Cooperative guidance strategy for multiple hypersonic gliding vehicles system

Cooperative guidance strategy for multiple hypersonic gliding vehicles system with flight constraints and cooperative constraints is investigated. This paper mainly cares about the coordination of the entry glide flight phase and driving-down phase. Different from the existing results, both the attack time and the attack angle constraints are considered simultaneously. Firstly, for the entry glide flight phase, a two-stage method is proposed to achieve the rapid cooperative trajectories planning, where the control signal corridors are designed based on the quasi-equilibrium gliding conditions. In the first stage, the bank angle curve is optimized to achieve the attack angle coordination. In the second stage, the angle of attack curve is optimized to achieve the attack time coordination. The optimized parameters can be obtained by the secant method. Secondly, for the driving-down phase, the cooperative terminal guidance law is designed where the terminal attack time and attack angle are considered. The guidance law is then transformed into the bank angle and angle of attack commands. The cooperative guidance strategy is summarized as an algorithm. Finally, a numerical simulation example with three hypersonic gliding vehicles is provided for revealing the effectiveness of the acquired strategy and algorithm.     

基于图像骨架和贪婪算法的无人机航路规划

针对无人机在执行低空突防任务时最大生存概率以及自身飞行约束的要求,对传统的人工势场法进行改进,提出基于图像骨架和贪婪算法的航路规划方法.对可飞区域提取图像骨架生成赋权图,采用Dijkstra方法搜索最小代价路径实现航路初规划;提出了曲率可控的贪婪算法对初规划结果进行优化,使最终的路径同时满足最小转弯半径和最短航程的要求.仿真结果表明该方法是一种有效的航路规划方法.     

基于投影寻踪的地磁匹配区选取方法

针对基于单一地磁特征参数进行区域选取容易出现评价结果不全面的缺陷,提出了多特征参数融合的地磁匹配区选取方法。该方法结合信息熵和投影寻踪理论,综合考虑地磁标准差、粗糙度、相关系数和地磁熵等反映特定区域内地磁的总体起伏、光滑度、相关性强弱和信息量多少的地磁特征参数对匹配区的影响,建立了基于投影寻踪的地磁匹配区选取模型,利用遗传算法求解出最优投影方向,给出区域总的评价指数。利用文中提出的方法在选定区域进行了仿真试验,仿真结果表明,针对ICCP算法,在总评价指标高的区域进行地磁辅助导航,其匹配误差较小。
     

微波功率均衡器的小型化设计

文章设计出一种小型化的微波功率均衡器。分析了均衡网络中谐振吸收枝节的特性,并讨论了谐振单元间匹配网络的设计原则与约束。对谐振单元和级间匹配网络的参数进行设定和调整,并利用仿真软件进行优化分析,可以设计出满足目标响应的均衡器。基于该方法,设计了频段为1GHz-2GHz、小型化的微波功率均衡器。     

带机械臂的月面巡视探测器的路径规划方法研究

针对巡视探测器路径规划和机械臂路径规划的不同和两者需要依次执行的连接需求,文章将月面巡视探测器的路径规划过程分为三个阶段：巡视探测器的路径规划、机械臂的路径规划、器臂动态联合的路径规划,针对不同的规划分别提出了不同的规划方法,并进行了仿真验证。研究结果表明,巡视探测器的整个路径规划是一个复杂的运算规划过程,在非结构化月面环境下,基于月面三维数字高程图采用改进的启发式搜索（A＊）算法,可以比较高效地完成巡视探测器的路径规划;在采用蒙特卡罗法建立机械臂可达工作空间的基础上,可以比较简单、准确地获取机械臂的规划路径;巡视探测器整个就位探测过程的实现需要两种规划的动态联合。     

Study on UAV Path Planning Approach Based on Fuzzy Virtual Force

This article proposes a novel fuzzy virtual force (FVF) method for unmanned aerial vehicle (UAV) path planning in complicated environment. An integrated mathematical model of UAV path planning based on virtual force (VF) is constructed and the corresponding optimal solving method under the given indicators is presented. Specifically, a fixed step method is developed to reduce computational cost and the reachable condition of path planning is proved. The Bayesian belief network and fuzzy logic reasoning theories are applied to setting the path planning parameters adaptively, which can reflect the battlefield situation dynamically and precisely. A new way of combining threats is proposed to solve the local minima problem completely. Simulation results prove the feasibility and usefulness of using FVF for UAV path planning. Performance comparisons between the FVF method and the A* search algorithm demonstrate that the proposed approach is fast enough to meet the real-time requirements of the online path planning problems.     

基于多分类器融合的航空发动机气路故障诊断

为解决航空发动机这一复杂系统的故障诊断问题,提高智能化诊断方法的准确率,使用了D-S证据理论对RBF神经网络、BP神经网络和支持向量机三个诊断子系统的诊断结果进行决策级融合,结果表明D-S证据理论的使用可以达到比单独运用三个子系统具有更好的诊断效能,经过融合降低了误诊率,改善了诊断性能。     

多UCAV协同航路规划算法

针对多UCAV协同航路规划问题,将协同进化理论与扩展Voronoi图模型相结合,提出了一种基于扩展Voronoi图模型与协同进化算法的多UCAV协同航路规划方法。该方法通过协同进化理论的合作机制实现了规划航路的空域协同,通过采用层次分解策略实现了规划航路的时域协同,并且对染色体设计、个体适应度以及进化操作等关键问题进行了研究。     

基于遗传算法的重定位容错方法的研究

随着网络成为人们获取信息的主要工具,人们对网络可靠性的要求也越来越高。针对网络中的结点出现故障而影响网络传输效率和可靠性问题,进行了基于遗传算法的重定位容错方法的研究。首先,描述了树型网络结构,根据网络组件的开销提出了网络代价目标函数。其次,阐述了遗传算法最小代价路径的搜索过程,提出了基于遗传算法的重定位容错方法。最后,通过仿真实验验证了重定位容错方法在路径搜索中的有效性。这样既缩短了路径搜索时间,又提高了网络传输信息的可靠性。     

基于波碰撞法的机器人路径规划法

文章提出了在离散区域上,基于起始点和目标点相向传播波碰撞法的机器人路径规划法。设机器人作业环境为二维平面大小一定的矩形地形,机器人行走时仅限于作原地转向或直线行走。基于此开展路径规划的仿真研究,提出了搜索许可路径的算法。计算机模拟结果证实该算法可行、有效。