共查询到20条相似文献,搜索用时 109 毫秒
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智能粒子滤波通过借鉴遗传算法思想能够减轻粒子退化现象。在基于遗传算法的智能粒子滤波基础上,该文提出对低权值粒子的改进的智能粒子滤波(IIPF)处理策略。在对粒子进行分离、交叉后,优化遗传算子,对低权值粒子进行自适应处理。低权值粒子根据权值大小自行判断是否为底层粒子;底层粒子将直接进行变异,其余低权值粒子将根据变异概率随机变异。仿真结果表明,改进的智能粒子滤波(IIPF)性能优于智能粒子滤波、一般粒子滤波算法和拓展卡尔曼滤波。在1维仿真实验中,改进的智能粒子滤波误差较一般粒子滤波算法和智能粒子滤波分别降低了10.5%和8.5%,且具有更好的收敛性;在多维仿真实验中,改进的智能粒子滤波较智能粒子滤波在高度均方根误差和平均误差上分别降低了8.5%和7.5%,在速度均方根误差和平均误差上分别降低了11.5%和7.6%;在乘性噪声和非高斯随机噪声中,改进的智能粒子滤波依旧有10%以上的性能优势。 相似文献
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在目标跟踪中,为了克服粒子滤波的粒子退化和贫化问题,提高滤波精度,文中将差分演化算法与容积粒子滤波相结合,形成了差分演化容积粒子滤波算法。在粒子进行先验更新时, 使用容积卡尔曼滤波算法融入当前时刻的量测信息并用其来产生重要性密度函数,并且在重采样阶段,用差分演化算法对根据重要性密度函数抽取的采样粒子做优化操作,从而克服粒子滤波存在的粒子退化及贫化问题,提高滤波性能。实验结果表明,和粒子滤波、无迹粒子滤波、容积粒子滤波相比,该算法有着更高的滤波精度和更好的稳定性,并且能够提高雷达机动目标跟踪的精确性。 相似文献
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为解决粒子滤波中的粒子退化和枯竭问题,提出一种动态人工鱼群粒子滤波算法,该算法在粒子滤波重采样过程中引入人工鱼群算法的觅食和聚群行为,并依据概率密度的动态比值动态调整人工鱼的移动步长,此算法提升了粒子的多样性,克服了粒子退化及枯竭问题;推动粒子向优选区域逼近,并提高了粒子的全局搜索能力,避免粒子陷入局部最优。将改进的动态人工鱼群粒子滤波在北斗/INS紧组合的模型上进行应用,并通过仿真与人工鱼群粒子滤波及标准粒子滤波算法PF相比较。仿真结果表明,动态人工鱼群粒子滤波可显著提高估算精度,从而为在利用北斗和INS在紧组合导航时提供了新的方法。 相似文献
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粒子滤波是解决非线性非高斯动态系统最优估计问题的研究热点。介绍了粒子滤波算法基本原理,分析了存在的几个关键问题和解决方法,进而总结归纳了当前15种主要改进的粒子滤波算法,同时介绍了粒子滤波目前主要应用领域,最后对粒子滤波的发展提出了展望。 相似文献
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ZHANG Pei-ling ;ZHANG Hong-xin ;LIU Hong-da ;ZHANG Yu-jing ;HE Peng-fei ;PANG Xue-li 《中国邮电高校学报(英文版)》2014,21(5):24-30
Particle filtering (PF) algorithm has the powerful potential for coping with difficult non-linear and non-Gaussian problems. Aiming at non-linear, non-Gaussian and time-varying characteristics of power line channel, a time-varying channel estimation scheme combined PF algorithm with decision feedback method is proposed. In the proposed scheme, firstly the indoor power line channel is measured using the pseudo-noise (PN) correlation method, and a first-order dynamic autoregressive (AR) model is set up to describe the measured channel, then, the channel states are estimated dynamically from the received signals by exploiting the proposed scheme. Meanwhile, due to the complex noise distribution of power line channel, the performance of channel estimation based on the proposed scheme under the Middleton class A impulsive noise environment is analyzed. Comparisons are made with the channel estimation scheme respectively based on least square (LS), Kalman filtering (KF) and the proposed algorithm. Simulation indicates that PF algorithm dealing with this power line channel estimation difficult non-linear and non-Gaussian problems performance is superior to those of LS and KF respectively, so the proposed scheme achieves higher estimation accuracy. Therefore, it is confirmed that PF algorithm has its own unique advantage for power line channel estimation. 相似文献
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粒子滤波(PF)非常适合处理非高斯状态空间模型的滤波问题,而SAR图像的非高斯降斑算法正是粒子滤波的一个有效应用,本文在平稳小波变换(SWT)域上提出了一种基于马尔可夫随机场(MRF)的改进PF的SAR图像降斑算法.新算法首先分析验证了SAR图像在SWT域比在DWT域中利用广义高斯分布(GGD)建模更为精确;然后针对基本PF降斑算法中的粒子整体权重偏差问题,引入MRF重新定义粒子权重,并通过权重更新粒子的采样区间以优化粒子分布;最后为了提高本文降斑算法的实时性,依据小波系数的局部统计特性把图像分为平滑和边缘进行分区域处理.本文针对模拟SAR图像和实测SAR图像进行了仿真,仿真结果和分析表明降斑后的图像能够在去除噪声的同时较好的保持图像的边缘和纹理结构特征,而且分区域处理有效地提高了算法的效率. 相似文献
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毫米波/红外多传感器融合跟踪算法研究 总被引:3,自引:0,他引:3
毫米波/红外(MMW/IR)传感器是各国发展多模复合制导技术的重点.针对平方根无迹卡尔曼滤波(SR-UKF)的估计算法存在线性化误差及粒子滤波中得到优化的重要性密度函数比较困难的问题,将平方根无迹卡尔曼滤波与粒子滤波相结合,提出一种序贯融合的平方根无迹卡尔曼粒子滤波(SRUKPF)算法.利用平方根无迹卡尔曼算法得到的状态更新矩阵和误差协方差矩阵,构造粒子滤波的重要性密度函数,这样重要性密度函数能够融入最新观测信息,进而更加符合真实状态的后验概率分布.为验证算法的有效性,以地空导弹中MMW/IR传感器复合制导为背景进行仿真研究与分析,结果表明,该算法克服了粒子滤波法难以得到优化重要性密度函数的缺陷,能有效提高多传感器系统状态估计的精度 相似文献
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为提高多传感器融合的精确度,提出一种容积信息粒子多传感器融合算法。算法将容积信息滤波(CIF)和粒子滤波(PF)结合一起,采用CIF传递PF的粒子,通过引入信息贡献向量和信息贡献矩阵,将多个传感器的量测信息更新到PF的粒子中,提高粒子与真实状态后验概率分布的逼近程度,改进多传感器融合精确度。同时将CIF估计值作为粒子,消除随机扰动对融合的影响,提高粒子有效度,进一步提高融合精确度。仿真与实验表明,算法能够有效处理集中式多传感器融合问题,具有较高的滤波精确度。 相似文献
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Particle Filter-Based Synchronization of Chaotic Colpitts Circuits Combating AWGN Channel Distortion
Zhi-Guo Shi Shao-Hua Hong Ji-Ming Chen Kang-Sheng Chen You-Xian Sun 《Circuits, Systems, and Signal Processing》2008,27(6):833-845
In this paper, synchronization of chaotic Colpitts circuits using a particle filter (PF) to combat the additive white Gaussian
noise (AWGN) channel effect is studied by numeric simulations. A novel PF algorithm suitable for chaos synchronization is
proposed. With this algorithm, chaos synchronization of Colpitts circuits can be achieved and maintained in AWGN channels.
Parameters in the proposed PF algorithm are studied to understand their effects on synchronization performance. The synchronization
performance using the proposed PF algorithm is compared with those using other digital filters, such as the extended Kalman
filter and the generic PF. It is found that the proposed PF algorithm performs better than the other digital filters. Simulation
results also show that the particle number is not very critical to the synchronization performance when this PF algorithm
is used. 相似文献
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介绍两种目标跟踪算法—扩展卡尔曼滤波器(Extended Kalman Filter,EKF)、粒子滤波器(Particle filter,PF)。EKF利用泰勒级数方法,将非线性问题转化到线性空间,再利用卡尔曼滤波器进行滤波,并达到一阶估计精度。PF是一种采用蒙特卡罗采样的贝叶斯滤波方法,它将复杂的目标状态分布表示为一组加权值,通过寻找在粒子滤波分布中最大权值的粒子来确定目标最可能所处的状态分布,已成为复杂环境下进行目标跟踪的最好的方法。文中通过仿真实验,对二者的性能进行了仿真比较,结果证明在复杂的非高斯非线性环境中,PF的性能明显优于EKF,但计算复杂,耗时长。 相似文献
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Jie Wang Qinghua Gao Hongyu Wang Hongyang Chen Minglu Jin 《Wireless Communications and Mobile Computing》2012,12(10):891-900
Benefitting from its ability to estimate the target state's posterior probability density function (PDF) in complex nonlinear and non‐Gaussian circumstance, particle filter (PF) is widely used to solve the target tracking problem in wireless sensor networks. However, the traditional PF algorithm based on sequential importance sampling with re‐sampling will degenerate if the latest observation appear in the tail of the prior PDF or if the observation likelihood is too peaked in comparison with the prior. In this paper, we propose an improved particle filter which makes full use of the latest observation in constructing the proposal distribution. The quality prediction function is proposed to measure the quality of the particles, and only the high quality particles are selected and used to generate the coarse proposal distribution. Then, a centroid shift vector is calculated based on the coarse proposal distribution, which leads the particles move towards the optimal proposal distribution. Simulation results demonstrate the robustness of the proposed algorithm under the challenging background conditions. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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为了解决杂波环境下多机动目标的数据关联难题,提出了一种将粒子滤波器(PF)和联合概率数据关联(JPDA)相结合的数据关联算法,该方法首先应用粒子滤波方法对目标的状态进行采样,得到样本(粒子),并结合量测,通过JPDA方法计算得到联合互连事件的关联概率,而该关联概率实际上就是PF中粒子的权值。通过选取适当的有效采样尺度作为衡量PF退化现象的测度,采用重要性重采样技术克服了标准PF的退化现象,降低了算法的计算量。仿真结果表明,粒子滤波方法可以较好地解决杂波环境下跟踪多机动目标的数据关联问题;重要性重采样PF的计算复杂度低于标准PF。 相似文献