基于投票分布积累的Hough变换航迹起始法?

针对密集杂波下匀加速运动的低可观测目标的航迹起始问题,提出了一种基于投票分布积累的Hough变换航迹起始法。该方法利用单元投票数以及该单元附近投票数的密集程度定义了投票密度和投票均值,构造了两级门限来滤除部分杂波,快速给出目标航迹参数在参数空间的大概位置,最后由直观法给出起始航迹的数目以及参数。仿真结果表明,该方法不仅能提高正确航迹起始概率、降低错误起始概率,而且所用时间短,尤其适用于复杂环境中的目标检测。     

基于Dijkstra算法的水平航迹规划

战术飞行任务的航迹规划是依靠地形信息和敌情信息,在某些约束条件下,找出作战飞机从起飞点到目标突防生存概率最大、航程最短的飞行轨迹的过程。采用简易方法建立了威胁模型,用Dijkstra算法实现了作战飞机整体最优水平航迹解算,并给出了具体算例,验证了算法的有效性和实用性。     

Effect of microstructure on short pulse duration shock initiation of TATB and initial response mechanism

Micro-TATB particles with different sizes and 3D nanoporous TATB architectures with different specific surface areas were prepared through recrystallization to study short pulse duration shock initiation properties by electric gun technology. For micro-TATB, the initiation threshold significantly decreases with TATB average size ranging from 79.7 μm to 0.5 μm. For 3D nanoporous TATB architecture, the initiation threshold decreases and then increases with specific surface areas increased from 9.6 m²/g to 36.2 m²/g. The lowest initiation thresholds are obtained for the micro-TATB with average sizes of 1.3 μm and 0.5 μm, and 3D nanoporous TATB architecture with specific surface area of 22.4 m²/g. The shock initiation thresholds of micro-TATB and 3D nanoporous TATB architectures show significantly decreases with the porosity increased. The decomposition reaction and thermal conductivity properties were further investigated to understand the initial response mechanism. High porosity provides more collapse sites to generate high temperature for formation of hot spots. The low thermal conductivity and decomposition temperature could enhance the formation and ignition of the hot spots, and initial decomposition reaction of TATB. The effect of the decomposition temperature is higher than that of the thermal conductivity on the shock initiation properties. The enhanced decomposition reaction could promote energy release and transfer process from the ignition to the combustion. This work offers a new insight to understand the effects of microstructure on the shock initiation properties and the initial response mechanism of TATB.     

基于一步延时的航迹起始改进算法

针对现有多目标航迹起始算法工程实践性不强的特点,研究了一种基于一步延时的航迹起始算法,并在分析该算法的基础上,针对该算法计算量随目标数目增加而成指数增长的不足,对其算法进行了改进,提出了一种双重滤波的一步延时的航迹起始算法。仿真结果表明,该算法提高了航迹的正确起始概率,减少了计算量,具有较好的工程应用前景。