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改进高斯混合粒子滤波被动目标跟踪算法 被引量:2
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作者 孔云波 冯新喜 鹿传国 《现代雷达》 CSCD 北大核心 2012年第7期44-50,58,共8页
针对被动传感器跟踪系统非线性较强问题,提出了一种基于改进高斯混合粒子滤波的被动传感器目标跟踪算法。该算法基于Sigma点卡曼滤波和粒子滤波的特点,用有限的高斯混合模型来近似后验状态密度、系统噪声和观测噪声的分布。然后结合遗... 针对被动传感器跟踪系统非线性较强问题,提出了一种基于改进高斯混合粒子滤波的被动传感器目标跟踪算法。该算法基于Sigma点卡曼滤波和粒子滤波的特点,用有限的高斯混合模型来近似后验状态密度、系统噪声和观测噪声的分布。然后结合遗传算法和EM算法来实现模型的降阶,克服了EM算法假定混合成分数为已知、迭代的结果需要依赖初始值、可能收敛到局部最大点或可能收敛到参数空间的边界的缺点,从而改善粒子枯竭的问题。仿真实验结果表明在被动传感器跟踪领域,与传统粒子滤波、基于EM的高斯混合粒子滤波和基于贪心EM的高斯混合粒子滤波相比,该算法在保持高精度估计能力的同时,具有较强的鲁棒性,是解决非线性系统状态估计问题的一种有效方法。 展开更多
关键词 被动传感器 遗传em算法 粒子滤波 混合高斯模型 模型降阶 纯方位跟踪
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FLIGHT DELAY STATE-SPACE MODEL BASED ON GENETIC EM ALGORITHM 被引量:2
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作者 陈海燕 王建东 徐涛 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2011年第3期276-281,共6页
Flight delay prediction remains an important research topic due to dynamic nature in flight operation and numerous delay factors.Dynamic data-driven application system in the control area can provide a solution to thi... Flight delay prediction remains an important research topic due to dynamic nature in flight operation and numerous delay factors.Dynamic data-driven application system in the control area can provide a solution to this problem.However,in order to apply the approach,a state-space flight delay model needs to be established to represent the relationship among system states,as well as the relationship between system states and input/output variables.Based on the analysis of delay event sequence in a single flight,a state-space mixture model is established and input variables in the model are studied.Case study is also carried out on historical flight delay data.In addition,the genetic expectation-maximization(EM)algorithm is used to obtain the global optimal estimates of parameters in the mixture model,and results fit the historical data.At last,the model is validated in Kolmogorov-Smirnov tests.Results show that the model has reasonable goodness of fitting the data,and the search performance of traditional EM algorithm can be improved by using the genetic algorithm. 展开更多
关键词 FLIGHT DELAY predictions dynamic data-driven application system genetic em algorithm
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