共查询到17条相似文献,搜索用时 62 毫秒
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徐晓 《计算技术与自动化》1990,9(2):11-15
本文介绍了ARMA模型的格型迭代法,并以在格型算法中具有最快收敛速率的最小二乘格型算法为基础获得了 ARMA模型最小二乘格型迭代递推辨识法。针对此算法最小二乘格型迭代递推辩识法计算机模拟辨识表明,该方法具有较好的辨识性能,且有一定的抗噪能力。 相似文献
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本文给出了一种新的ARMA模型AR部分的阶次与参数估计的超定快速递推算法,提高了运算速度和估计精度。 相似文献
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系统辨识的研究一般是将系统的阶次辨识和参数估计分开的,但实际应用过程中这两个问题又是紧密相关的。有的模型阶次辨识过程是伴随着模型的参数估计,因此可以对这类阶次辨识方法同参数估计的方法进行融合和扩展。针对输出误差系统,借助辅助模型推导出基于残差方差递推算法,利用该算法辨识出了模型的阶次和参数,减少了传统系统辨识过程的计算量和辨识时间。 相似文献
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基于δ算子的滑动窗自适应格形滤波器 总被引:3,自引:0,他引:3
本文利用最小二乘几何投影方法详细推导了一种基于滤波器δ算子的滑动窗自适应格形滤波算法,瘩深入讨论了这种滤波器在系统辨识和参数变化检测中的应用。 相似文献
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ARMA时间序列模型的研究与应用 总被引:5,自引:0,他引:5
ARMA模型是一种最常见的重要的时间序列模型,它被广泛应用到各种行业预测中,本文在给出ARMA三种模式和实现方法的同时,给出ARMA模型在股市应用的一个实例。 相似文献
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Han-Fu Chen
P. R. Kumar
J. H. van Schuppen
《Systems & Control Letters》1989,13(5):397-404We consider linear stochastic systems with additive white Gaussian noise, with the added generality that the system matrices are random and adapted to the observation process. The main result of this paper is that in order for the standard Kalman filter to generate the conditional mean and conditional covariance of the conditionally Gaussian distributed state, it is sufficient for the random matrices to be finite with probability one at each time instant. This generalizes the best previous results available to date, to our knowledge, which require the more stringent hypothesis that the entries of the random matrices should possess finite second moments at each time instant.
A significant application of the results of this paper is to the problem of recursive identification of the unknown parameters of a controlled linear stochastic system. In such problems, the observation matrix is typically generated by complicated nonlinear feedback, as for example in adaptive control, and the finiteness of the second moments is difficult, if not impossible, to establish, while the finiteness with probability one has been established in many applications. 相似文献
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针对时滞和阶次未知的双率采样输出误差系统,在有限采样数据条件下,提出一种辅助模型正交匹配追踪迭代辨识算法.首先,根据双率采样数据建立目标系统的辨识模型;其次,考虑到输入通道的时滞与系统阶次未知,采用过参数化方法,通过设置足够长的无噪输出数据和输入数据回归项,得到一个稀疏度为待辨识参数个数的稀疏系统;然后,结合辅助模型思想和压缩感知中的稀疏恢复方法实现参数向量和无噪输出的交互估计,即利用正交匹配追踪算法估计参数向量,再利用该估计值构建辅助模型计算无噪输出,并以此更新参数估计向量;最后,根据得到的参数向量结构计算系统的阶次与通道的时滞.仿真实验表明,所提出算法能够利用少量采样数据实现系统参数、时滞和阶次的高精度联合估计. 相似文献
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Stochastic approximation algorithms for parameter identification are derived by a sequential optimization and weighted averaging procedure with an instructive geometric interpretation. Known algorithms including standard least squares and suboptimal versions requiring less computational effort are thereby derived. More significantly, novel schemes emerge from the theory which, in the cases studied to date and reported here, converge much more rapidly than their nearest rivals amongst the class of known simple schemes. The novel algorithms are distinguished from the known ones by either a different step size selection, and/or by working with a transformed state variable with components relatively less correlated, and/or by replacing the state vector in a crucial part of the calculations by its componentwise pseudoinverse.The convergence rate of the novel schemes in our simulations is significantly closer to that of the more sophisticated optimal least square recursions than other stochastic approximations schemes in the literature. For the case of extended least squares and recursive maximum likelihood schemes, the novel stochastic recursion performs, in loose terms within a factor of 10 (rms error), of the more sophisticated schemes in the literature. An asymptotic convergence analysis for the algorithms is a minor extension of known theory. 相似文献
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C.Richard Johnson 《Automatica》1980,16(4):419-421
The task of discrete model reference adaptive control is manipulated into an output error identification problem. Strictly causal output error identifiers recently developed as adaptive recursive filters are therefore proposed for unique provision of a model reference adaptive control algorithm relying only on input-output data. 相似文献
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