Wiener-Hammerstein benchmark with process noise

The Wiener-Hammerstein system structure is a well-known block-oriented structure. It contains a static nonlinearity that is sandwiched in between two linear time-invariant (LTI) blocks. The presence of the two LTI blocks results in a problem that is harder to identify. The LTI blocks are realized as active filters while the static nonlinearity is implemented as a diode-resistor electronic circuit.<br>The Wiener-Hammerstein system proposed here as a benchmark contains dominant process noise. The process noise enters the system before the static nonlinearity. Two much less significant noise sources are present in the measurement channels of the input and output.<br>All the provided files, data and information on the Wiener-Hammerstein system are available for download here together with an in-depth description of the measured input-output time series. This zip-file contains a detailed system description, an example estimation data set, the test data sets, the datasets measured during the past measurement campaign(s), pictures of the measurement setup, and an indicative electrical circuit schematic of the system. It is possible that the actual implemented Wiener-Hammerstein system deviates at some points (resistor values, opamp type) from the electrical circuit provided here. The data is available in the .csv and .mat file format.<br><br>

维纳-哈默斯坦因（Wiener-Hammerstein）系统结构是一种广为人知的面向模块的系统架构。该架构包含一个静态非线性环节，夹在两个线性时不变（Linear Time-Invariant, LTI）模块之间。由于这两个LTI模块的存在，系统辨识难度显著提升。其中LTI模块通过有源滤波器实现，静态非线性环节则采用二极管-电阻电子电路搭建。

本次作为基准测试提出的维纳-哈默斯坦因系统，搭载了占主导地位的过程噪声。该过程噪声在静态非线性环节之前引入系统；此外在输入与输出的测量通道中，还存在另外两个影响相对微弱的噪声源。

本数据集提供的所有与维纳-哈默斯坦因系统相关的文件、数据及信息，连同对实测输入输出时间序列的详细说明，均可在此处下载。该压缩包包含系统详细说明、示例辨识数据集、测试数据集、历次测量活动中采集的数据集、测量装置实拍图，以及系统的示意性电气电路原理图。实际搭建的维纳-哈默斯坦因系统，可能在部分细节（如电阻阻值、运算放大器型号）上与此处提供的电路原理图存在偏差。数据集提供.csv与.mat两种文件格式。