排序方式: 共有150条查询结果,搜索用时 15 毫秒
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针对基于对称量测方程的多目标跟踪,传统的滤波手段无法解决因对称变换带来的非高斯问题,提出一种新的遗传粒子滤波方法。新的滤波算法利用粒子的噪声含量与权值的负相关,改进了更新过程中权值计算所依赖的概率密度函数,避免了新量测噪声的求解。同时利用遗传算法的优势,保障了粒子的多样性,提高了粒子的使用效率,防止了滤波发散及局部最优。仿真结果表明,基于对称量测方程的多目标跟踪中,改进的遗传粒子滤波算法较扩展卡尔曼滤波算法、不敏卡尔曼滤波算法和联合概率数据关联滤波算法跟踪效果更好。 相似文献
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针对高斯混合概率假设密度(GMPHD)滤波算法中的机动目标跟踪问题,提出BFG-GMPHD算法,扩展了GMPHD滤波算法的适用范围。算法利用最佳拟合高斯(BFG)分布来近似目标动态模型中的状态转移矩阵和过程噪声的协方差矩阵,实现了滤波器与不同动态模型的匹配;在对BFG分布进行递推时,引入了模型概率更新过程,解决了BFG仅依赖于先验信息的问题;并利用UKF算法对GMPHD的高斯分量进行递推,使得算法能处理量测方程为非线性的情况。仿真实验表明,BFG-GMPHD算法能快速匹配目标模型的变化,实现对多机动目标的有效跟踪,准确估计出目标的数目和状态。 相似文献
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王胜兵 《海军工程大学学报》2001,13(2):45-48
引入带权的Sobolev空间 ,讨论了奇型非线性抛物问题的有限元方法 ,在a(u) ,f(u)均满足Lips chitz条件下 ,证明了相应椭圆投影算子Rhu与u之间误差估计式 ,并在一定的假设下 ,给出了奇型非线性抛物问题的广义解u及半离散问题的有限元解uh 误差估计式 . 相似文献
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John M. Ballard 《Arms and Armour》2018,15(1):83-95
In 1920, the Birmingham Small Arms Company supplied 10,000 Pattern 1907 bayonets to the government of Siam to accompany an order for rifles. The original maker of these bayonets was unknown, but historical research indicates that the Wilkinson Sword Co. Ltd. was a primary maker. The weights of some surviving Pattern 1907 bayonets, including twelve bayonets from the 10,000 described above, produced by the six makers in the UK before and during the Great War (1914–1918) period were available. A statistical analysis of the data was performed to compare with the historical research. The results strongly supported that the Wilkinson Sword Co. Ltd. was a primary maker. They were also sufficient to exclude from this batch of twelve bayonets the Royal Small Arms Factory (Enfield) and Vickers Ltd. as manufacturers. The statistical evidence for the presence of bayonets made by J.A. Chapman Ltd., R. Mole & Sons and Sanderson Bros. was weaker than that for the Wilkinson Sword Co. Ltd., but was nevertheless supportive of that hypothesis. Overall, the analysis was consistent with the supply to Siam of commingled bayonets from British government stores. It was noted that the bayonets for the Siam contract fell into a relatively narrow weight range, but the reason for this could not be determined. 相似文献
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大型综合公共建筑的火灾有其特殊性,应用层次分析法进行火灾风险评估时,关键在于根据消防工作的特点,结合在实际工作中得到的经验,建立评估的指标体系和各指标的评价尺度,这样才能得出符合实际的工作方法。 相似文献
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为了提高同类型装备集中采购效益,构建了同类型装备集中采购评标指标体系,综合运用熵权法和VIKOR方法,建立了同类型装备集中采购评标模型。应用实例结果表明,该模型可以用来对投标单位评估,并较精确地展现投标单位的技术和经济实力,为评标提供科学的依据。 相似文献