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arXiv 2501.16625eess.SYcs.LGcs.SY
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基于线性高斯模型的系统辨识迭代贝叶斯方法

An Iterative Bayesian Approach for System Identification based on Linear Gaussian Models

Department of Aeronautics and Astronautics, Stanford University(航空航天系,斯坦福大学)

Alexandros E. Tzikas, Mykel J. Kochenderfer

AI总结:

该研究针对系统辨识问题,提出一种含迭代参数优化与不确定性驱动输入选择的贝叶斯方法,仅需输入输出数据与模型一阶信息,适用于各类系统与参数模型,经线性及非线性动力学测试验证有效。

摘要:

我们研究系统辨识问题,即选择输入、观测真实系统的对应输出,并优化模型参数以最佳拟合数据。我们提出了一种实用且计算上易处理的方法,该方法适用于任何系统和参数化模型族。我们的方法仅需系统的输入输出数据以及模型关于参数的一阶信息。该方法包含两个模块:首先,我们从贝叶斯视角构建系统辨识问题,使用线性高斯模型近似来迭代优化模型参数;在每次迭代中,我们提出利用输入输出数据调整线性高斯模型的协方差,这种在线协方差校准可稳定拟合过程并指示模型的不准确性。其次,我们为模型参数定义了一种基于高斯的不确定性度量,随后可针对下一个待选输入最小化该度量。我们在线性和非线性动力学系统上测试了所提方法。

英文摘要:

We tackle the problem of system identification, where we select inputs, observe the corresponding outputs from the true system, and optimize the parameters of our model to best fit the data. We propose a practical and computationally tractable methodology that is compatible with any system and parametric family of models. Our approach only requires input-output data from the system and first-order information of the model with respect to the parameters. Our approach consists of two modules. First, we formulate the problem of system identification from a Bayesian perspective and use a linear Gaussian model approximation to iteratively optimize the model's parameters. In each iteration, we propose to use the input-output data to tune the covariance of the linear Gaussian model. This online covariance calibration stabilizes fitting and signals model inaccuracy. Secondly, we define a Gaussian-based uncertainty measure for the model parameters, which we can then minimize with respect to the next selected input. We test our method with linear and nonlinear dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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