arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.06289eess.SYcs.SY
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基于矢量拟合的系统辨识模型传递函数估计

Transfer Function Estimation in System Identification Toolbox via Vector Fitting

Ahmet Arda Ozdemir, Suat Gumussoy

摘要:

本文考虑黑盒和灰盒连续时间传递函数估计的频率响应测量。第一个贡献是一个双线性映射的原问题从虚轴到unitdisk。这改进了基础Sanathanan-Koerner迭代和最近的工具变量迭代的数值。利用单位圆盘上的正交有理基函数。每个迭代步骤都需要用这些基函数实现最小状态空间。其中一个这样的推导是第二个贡献。用这些基函数进行系统辨识,得到零极点增益模型。第三个贡献是一个有效的方法来表达传递函数系数约束的正交有理基函数。这允许估计具有任意相对阶的传递函数模型(包括不适当的模型)以及其他固定和有界参数值。该算法在频域数据的系统辨识测试(2016 b版,与MATLAB配合使用)中的tfest函数中实现。两个例子来证明算法的性能。

英文摘要:

This paper considers black- and grey-box continuous-time transfer function estimation from frequency response measurements. The first contribution is a bilinear mapping of the original problem from the imaginary axis onto the unitdisk. This improves the numerics of the underlying Sanathanan-Koerner iterations and the more recent instrumental-variable iterations. Orthonormal rational basis functions on the unit disk are utilized. Each iteration step necessitates a minimal state-space realization with these basis functions. One such derivation is the second contribution. System identification with these basis functions yield zero-pole-gain models. The third contribution is an efficient method to express transfer function coefficient constraints in terms of the orthonormal rational basis functions. This allows for estimating transfer function models with arbitrary relative degrees (including improper models), along with other fixed and bounded parameter values. The algorithm is implemented in the tfest function in System Identification Toolbox (Release 2016b, for use with MATLAB) for frequency domain data. Two examples are presented to demonstrate the algorithm performance.

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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