共查询到18条相似文献,搜索用时 390 毫秒
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为了解决粒子滤波算法中重采样后粒子中包含重复点过多,从而丧失了粒子的多样性等问题,文中在重采样后引入一个马尔可夫链蒙特卡罗(MCMC)移动步骤来增加粒子的多样性,因而能更好地近似状态的后验概率分布。 相似文献
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针对现有利用阵列单通道系统对机动目标跟踪精度不高,实时性差等不足,提出了一种新的基于改进粒子滤波算法的阵列单通道机动目标波达方向(direction of arrival, DOA)跟踪方法。该方法首先在利用接收机轮流采样建立数学模型的基础上,建立跟踪模型。然后,利用粒子群优化算法对马尔科夫链蒙特卡罗(Markov Chain Monte Carlo, MCMC)粒子滤波算法的重采样环节进行优化处理,给出了一种交互MCMC粒子滤波算法,该算法克服了传统粒子滤波算法粒子退化及样本贫化的固有缺陷。最后利用该算法求解跟踪方程,实现了实时DOA估计。理论分析与仿真结果表明,本文方法可实现基于阵列单通道的DOA跟踪与波束形成一体化,且能够处理相干信号,与标准粒子滤波和子空间类算法相比,收敛速度快,跟踪精度高。 相似文献
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粒子滤波算法中重采样是解决粒子退化的一种重要方法,但重采样会导致粒子多样性的损失。针对这一问题,对基本重采样算法进行了改进。改进算法首先按基本重采样思想找到权值大的粒子进行复制,然后借鉴遗传算法进行交叉和变异操作,其中变异由变异尺度因子和粒子集的均值来实现。利用改进重采样的粒子滤波算法对经典纯方位目标跟踪问题进行了仿真,仿真结果表明,改进算法具有更好的跟踪精度。 相似文献
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在OFDM通信系统中,为了解决非线性的目标跟踪问题,提出了基于改进混合蛙跳算法(SFLA)和粒子滤波算法(PF)相结合的方法来研究动态目标跟踪技术.首先利用高斯变异的局部搜索能力强和柯西变异的全局搜索能力强等优点对混合蛙跳算法进行改进,然后用改进后的混合蛙跳算法来优化粒子滤波算法进行动态跟踪,其优点不需要重采样步骤,有效地保持了粒子的多样性和有效性.仿真结果表明,该算法能够有效实现动态目标跟踪,并且跟踪效果优于同等条件下的混合蛙跳算法和粒子滤波算法. 相似文献
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Direct tracking problem of moving noncircular sources for multiple arrays is investigated in this study. Here, we propose an improved unscented particle filter (I-UPF) direct tracking method, which combines system proportional symmetry unscented particle filter and Markov Chain Monte Carlo (MCMC) algorithm. Noncircular sources can extend the dimension of sources matrix, and the direct tracking accuracy is improved. This method uses multiple arrays to receive sources. Firstly, set up a direct tracking model through consecutive time and Doppler information. Subsequently, based on the improved unscented particle filter algorithm, the proposed tracking model is to improve the direct tracking accuracy and reduce computational complexity. Simulation results show that the proposed improved unscented particle filter algorithm for noncircular sources has enhanced tracking accuracy than Markov Chain Monte Carlo unscented particle filter algorithm, Markov Chain Monte Carlo extended Kalman particle filter, and two-step tracking method. 相似文献
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传统粒子滤波器(PF)直接根据状态演化方程产生新的粒子,由于没有考虑新近观测对状态估计的影响,这种滤波器性能较差,即便在粒子数目很大的情况也是如此。为此,本文提出一种基于序贯重要采样(SIS)的改进粒子滤波算法,该算法采用集成了新近观测量的最优采样(或重要密度)函数指导粒子的生成,使粒子权值的方差最小化,能有效减轻粒子退化问题;同时。在粒子重采样之后增加了马尔科夫链蒙特卡洛(MCMC)过程,消除了重采样引起的粒子贫化的负面影响,从而使粒子的多样性得以保持。对非线性系统的状态估计和只测角跟踪的仿真实例均表明,本文所提出的算法比传统估计算法如EKF,UKF具有更高的精度和更强的鲁棒性;与标准PF相比,其性能也有较大的提高,并可以在相同的估计精度下大大减少所需的粒子数目,是一种有效的非线性滤波算法。 相似文献
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The particle Probability Hypotheses Density (particle-PHD) filter is a tractable approach for Random Finite Set (RFS) Bayes estimation, but the particle-PHD filter can not directly derive the target track. Most existing approaches combine the data association step to solve this problem. This paper proposes an algorithm which does not need the association step. Our basic ideal is based on the clustering algorithm of Finite Mixture Models (FMM). The intensity distribution is first derived by the particle-PHD filter, and then the clustering algorithm is applied to estimate the multitarget states and tracks jointly. The clustering process includes two steps: the prediction and update. The key to the proposed algorithm is to use the prediction as the initial points and the convergent points as the estimates. Besides, Expectation-Maximization (EM) and Markov Chain Monte Carlo (MCMC) approaches are used for the FMM parameter estimation. 相似文献
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自举粒子滤波(BPF:Bootstrap Particle Filtering)是一种经典而应用广泛的粒子滤波算法,但其重采样后常会引起严重的样本枯竭问题.本文提出在权值蜕化较为严重时,在原先的重采样前增加SFN预处理,即权值排序、裂变繁殖(fission)和权值归一,得到裂变BPF(FBPF)算法.针对一个典型的后验密度为双峰的强非线性滤波估计问题,通过Monte Carlo仿真表明,FBPF算法在保持与BPF算法相当的估计精度和运算时间的条件下,克服了样本枯竭问题,算法的鲁棒性更强. 相似文献
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以说话人跟踪问题作为应用背景,针对非线性、非高斯随机系统的状态估计问题,本文将量子进化算法和粒子滤波相结合,提出了一种量子进化粒子滤波算法.该算法采用量子编码来表示粒子;通过模拟量子坍塌产生粒子集,同时引入量子变异与量子交叉操作来保持粒子的多样性,从而提高了算法的滤波性能.计算机仿真与说话人跟踪实验结果表明,量子进化粒子滤波算法比通常的粒子滤波算法具有更好的滤波性能. 相似文献
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Lithium-ion batteries are widely used as power sources in various portable electronics, hybrid electric vehicles, aeronautic and aerospace engineering, etc. To ensure an uninterruptible power supply, the remaining useful life (RUL) prediction of lithium-ion batteries has attracted extensive attention in recent years. This paper proposed an improved unscented particle filter (IUPF) method for lithium-ion battery RUL prediction based on Markov chain Monte Carlo (MCMC). The method uses the MCMC to solve the problem of sample impoverishment in UPF algorithm. Additionally, the IUPF method is proposed on the basis of UPF, so it can also suppress the particle degradation existing in the standard PF algorithm. In this work, the IUPF method is introduced firstly. Then, the capacity data of lithium-ion batteries are collected and the empirical capacity degradation model is established. The proposed method is used to estimate the RUL of lithium-ion battery. The RUL prediction results demonstrate the effectiveness and advantage. 相似文献
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Extensions of the SMC-PHD filters for jump Markov systems 总被引:1,自引:0,他引:1
The probability hypothesis density (PHD) filter is a promising algorithm for multitarget tracking, which can be extended for jump Markov systems (JMS). Since the existing multiple model sequential Monte Carlo PHD (MM SMC-PHD) filter is not interacting, two extensions of the SMC-PHD filters are developed in this paper. The interacting multiple-model (IMM) SMC-PHD filter approximates the model conditional PHD of target states by particles, and performs the interaction by resampling without any a priori assumption of the noise. The IMM Rao-Blackwellized particle (RBP) PHD filter uses the idea of Rao-Blackwellized to further enhance the performance of target state estimation for JMS with mixed linear/nonlinear state space models. The simulation results show that the proposed algorithms have better performances than the existing MM SMC-PHD filter in terms of state filtering and target number estimation. 相似文献