共查询到19条相似文献,搜索用时 125 毫秒
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非线性随机动态系统的滤波问题是一类经常遇到的实际应用问题,本文分析了扩展卡尔曼(EKF)、无迹卡尔曼滤波(UKF)和粒子滤波(PF)这三种非线性滤波算法的基本原理和特点以及适应的条件。并通过一个强非线性系统的实验仿真,验证了各自算法的性能。 相似文献
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提出了一种禁忌遗传粒子滤波跟踪算法。用遗传算法作全局搜索,用禁忌搜索算法作局部搜索,可以提高遗传算法的局部搜索能力,避免收敛到局部最优点。仿真结果表明:与原算法相比,禁忌遗传粒子滤波算法在大噪声条件下改善了粒子贫乏问题,提高了跟踪精度。 相似文献
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分析了非线性互补问题求解困难,利用粒子群算法并结合极大熵函数法给出了该类问题的一种新的有效算法。该算法首先利用极大熵函数将非线性互补问题转化为一个无约束最优化问题,然后应用粒子群算法来优化该问题,计算机程序实现表明该算法是有效的。 相似文献
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提出了一种禁忌递阶遗传粒子滤波跟踪算法.结合禁忌搜索算法和递阶遗传算法提出一种禁忌递阶遗传算法,用递阶遗传算法作全局搜索,用禁忌搜索算法作局部搜索,该算法能在一定程度上克服早熟问题,避免收敛到局部最优点.仿真结果表明:该算法在大噪声条件下改善了粒子贫乏问题,提高了跟踪精度及速度. 相似文献
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卡尔曼滤波器是基于状态空间模型的最小方差估计,广泛应用于动力电池状态估计领域。而在实际运用中,运用卡尔曼滤波a算法对动力电池状态进行估算的结果通常会出现发散的现象。为了解决这一问题,文章从算法的发散根源出发,根据不同的发散因子,提出相应的改进措施,确保卡尔曼滤波的鲁棒性,并以扩展卡尔曼滤波估算动力电池的电荷状态为例,通过算法改进前后的结果对比,验证了改进算法的有效性,同时也为无迹卡尔曼滤波、中心差分滤波、高斯埃尔米特滤波等相关算法的鲁棒性改进提供了理论指导与参考。 相似文献
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申继鹏 《中国高新技术企业评价》2015,(13):42-43
卡尔曼滤波是一种应用相当广泛的滤波方法。文章将卡尔曼滤波算法用于路面垂直载荷信号处理,通过数学建模、理论分析及实验验证,得到经过卡尔曼滤波算法处理后的路面垂直载荷,提高了数据的可靠性与真实性,对路面检测信号处理研究及采集人员分析路面状况具有重要意义。 相似文献
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卡尔曼滤波及其改进方法在行驶车辆状态估计中有着广泛的应用,并取得良好的效果;本文针对自适应卡尔曼滤波算法、无轨迹卡尔曼滤波算法的应用等进行了综合性阐述。 相似文献
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Once the structure form of demand and supply is translated into areduced form, one can solve the reduced form with a state space modelof the Kalman filter method. This paper discusses an innovationrepresentation that links the structure form with the state space model.For the state space model, the recursive Expectation Maximization(EM) algorithm is used to estimate the parameters of a structure form.This research successfully applied the Kalman filter method to theestimation of the coefficients of simultaneous equations withoveridentifying rank restrictions. The empirical monthly data set camefrom the medium-size scooter market in Taiwan during 1987 to 1992period. 相似文献
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The discrete Kalman filter applied to linear regression models: statistical considerations and an application 总被引:1,自引:0,他引:1
In this paper we show how the Kalman filter, which is a recursive estimation procedure, can be applied to the standard linear regression model. The resulting "Kalman estimator" is compared with the classical least-squares estimator.
The applicability and (dis)advantages of the filter are illustrated by means of a case study which consists of two parts. In the first part we apply the filter to a regression model with constant parameters and in the second part the filter is applied to a regression model with time-varying stochastic parameters. The prediction-powers of various "Kalman predictors" are compared with "least-squares predictors" by using T heil 's prediction-error coefficient U. 相似文献
The applicability and (dis)advantages of the filter are illustrated by means of a case study which consists of two parts. In the first part we apply the filter to a regression model with constant parameters and in the second part the filter is applied to a regression model with time-varying stochastic parameters. The prediction-powers of various "Kalman predictors" are compared with "least-squares predictors" by using T heil 's prediction-error coefficient U. 相似文献
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Stefano Grassi Nima Nonejad Paolo Santucci De Magistris 《Journal of Applied Econometrics》2017,32(2):318-341
We propose and study the finite‐sample properties of a modified version of the self‐perturbed Kalman filter of Park and Jun (Electronics Letters 1992; 28 : 558–559) for the online estimation of models subject to parameter instability. The perturbation term in the updating equation of the state covariance matrix is weighted by the estimate of the measurement error variance. This avoids the calibration of a design parameter as the perturbation term is scaled by the amount of uncertainty in the data. It is shown by Monte Carlo simulations that this perturbation method is associated with a good tracking of the dynamics of the parameters compared to other online algorithms and to classical and Bayesian methods. The standardized self‐perturbed Kalman filter is adopted to forecast the equity premium on the S&P 500 index under several model specifications, and determines the extent to which realized variance can be used to predict excess returns. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Hermann Singer 《Statistica Neerlandica》2008,62(1):29-57
Stochastic differential equations (SDE) are used as dynamical models for cross-sectional discrete time measurements (panel data). Thus causal effects are formulated on a fundamental infinitesimal time scale. Cumulated causal effects over the measurement interval can be expressed in terms of fundamental effects which are independent of the chosen sampling intervals (e.g. weekly, monthly, annually). The nonlinear continuous–discrete filter is the key tool in deriving a recursive sequence of time and measurement updates. Several approximation methods including the extended Kalman filter (EKF), higher order nonlinear filters (HNF), the local linearization filter (LLF), the unscented Kalman filter (UKF), the Gauss–Hermite filter (GHF) and generalizations (GGHF), as well as simulated filters (functional integral filter FIF) are compared. 相似文献