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针对遗传粒子滤波算法中粒子匮乏问题,提出一种新的基于粒子群优化的遗传粒子滤波算法。利用粒子群优化算法,驱动粒子向高似然区域移动,以增加有效粒子的数目,从而抑制粒子退化和匮乏现象,同时将遗传算法中的选择、交叉、变异引入粒子滤波,以改善粒子退化及计算量大的问题。实验表明,该算法有效地改善了粒子匮乏现象,同时提高了状态预估的精度,降低了算法的计算量,提高了算法的鲁棒性。 相似文献
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为了解决粒子滤波算法中存在的严重的退化现象,以及采用常规的重采样方法解决退化问题导致的粒子耗尽问题,研究了粒子滤波退化现象存在的原因和量子遗传算法具有的优点,将量子遗传算法引入粒子滤波,提出了基于量子遗传粒子滤波的无线传感器网络目标跟踪算法.通过量子遗传算法的编码方式增加粒子集的多样性,从而缓解了粒子滤波的退化现象并解决了粒子耗尽问题,而量子的并行性也节省了计算时间,提高了跟踪的实时性.仿真结果表明了该算法是可行的. 相似文献
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针对基本粒子滤波存在严重的退化问题和重采样技术导致粒子枯竭的问题,提出一种新型粒子滤波算法——基于小生境技术的群智能优化粒子滤波算法.通过多模寻优增强粒子的多样性和寻优能力,使得采样后的粒子向高似然区域移动,从而有效地提高了系统状态估计精度.仿真实验表明,该算法是有效而稳定的. 相似文献
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针对常规的粒子滤波算法存在粒子权值退化和采样粒子贫化以及需要大量粒子才能进行比较准确的状态估计的问题,提出了一种基于混沌的萤火虫改进粒子滤波算法.利用混沌系统所具有的遍历性和随机性初始化粒子群,使得初始粒子分布更加均匀,同时向常规粒子滤波算法中引进萤火虫算法的寻优机制,使得粒子能够向高似然区域运动,提高了滤波精度,并对部分权值优秀粒子进行混沌细搜索,对部分权值低的粒子进行再生,提高了种群多样性.实验表明:该方法尤其是在粒子种群数量较小的情况下,较常规粒子滤波精度更高,并有效地改善了权值退化和样本贫化问题. 相似文献
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提出一种基于改进PSO的优化滤波算法,构造多指标均衡的适应度函数,把滤波增益作为PSO的粒子进行优化求解,同时将最小方差鲁棒滤波增益和H∞滤波增益以及它们的组合平均值作为PSO的初始粒子,赋予粒子一定的认知能力,大大提高收敛速度。仿真表明新的优化滤波算法滤波精度高,鲁棒性强,实时性好。 相似文献
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In this paper, an adaptive estimation algorithm is proposed for non-linear dynamic systems with unknown static parameters based on combination of particle filtering and Simultaneous Perturbation Stochastic Approxi- mation (SPSA) technique. The estimations of parameters are obtained by maximum-likelihood estimation and sampling within particle filtering framework, and the SPSA is used for stochastic optimization and to approximate the gradient of the cost function. The proposed algorithm achieves combined estimation of dynamic state and static parameters of nonlinear systems. Simulation result demonstrates the feasibilitv and efficiency of the proposed algorithm 相似文献
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In this paper, an adaptive estimation algorithm is proposed for non-linear dynamic systems with unknown static parameters based on combination of particle filtering and Simultaneous Perturbation Stochastic Approximation (SPSA) technique. The estimations of parameters are obtained by maximum-likelihood estimation and sampling within particle filtering framework, and the SPSA is used for stochastic optimization and to approximate the gradient of the cost function. The proposed algorithm achieves combined estimation of dynamic state and static parameters of nonlinear systems. Simulation result demonstrates the feasibility and efficiency of the proposed algorithm. 相似文献
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郑娟毅 《计算机工程与应用》2011,47(15):83-85
分析了无线移动传感器网络中目标的跟踪原理,研究了基本粒子滤波算法的主要技术。对基本粒子滤波的重要性函数和重采样技术进行改进后,给出了一种提高基本粒子滤波算法跟踪精度的方法。通过仿真比较可以看出改进粒子滤波算法有较好的跟踪精度。在无线移动传感器网络中强调跟踪精度的场合,改进的粒子滤波算法会有更好的跟踪效果。 相似文献
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In this paper a novel filtering procedure that uses a variant of the variable neighborhood search (VNS) algorithm for solving nonlinear global optimization problems is presented. The base of the new estimator is a particle filter enhanced by the VNS algorithm in resampling step. The VNS is used to mitigate degeneracy by iteratively moving weighted samples from starting positions into the parts of the state space where peaks and ridges of a posterior distribution are situated. For testing purposes, bearings-only tracking problem is used, with two static observers and two types of targets: non-maneuvering and maneuvering. Through numerous Monte Carlo simulations, we compared performance of the proposed filtering procedure with the performance of several standard estimation algorithms. The simulation results show that the algorithm mostly performed better than the other estimators used for comparison; it is robust and has fast initial convergence rate. Robustness to modeling errors of this filtering procedure is demonstrated through tracking of the maneuvering target. Moreover, in the paper it is shown that it is possible to combine the proposed algorithm with an interacted multiple model framework. 相似文献
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基于自适应粒子滤波的动态贝叶斯网推理算法 总被引:1,自引:1,他引:0
提出一种基于自适应粒子滤波的动态贝叶斯网推理算法,该算法能随着动态贝叶斯网状态演化的不确定性动态改变抽样粒子数目,其根据是通过给定抽样误差界限来确定粒子数。当状态空间不确定性较低时,算法使用较少的粒子数;当状态空间不确定性很大时,将使用较多的粒子数。模拟实验表明该算法很好地兼顾了推理精度和推理时间,性能优于粒子滤波算法;与RBPF算法相比,该算法在稳定性和适用性方面也具有一定优势。 相似文献