频率响应模型

利用频谱分析获得的频率响应模型

频率响应模型是对一系列频率值进行计算的线性系统的频率响应。该模型由 idfrd 模型对象表示，该对象存储频率响应、采样时间和输入-输出通道信息。

App

系统辨识	从测量数据辨识动态系统模型

Estimate spectral model using time-domain data in the Live Editor (自 R2021b 起)

`etfe`	Estimate empirical transfer functions and periodograms
`spa`	Estimate frequency response with fixed frequency resolution using spectral analysis
`spafdr`	Estimate frequency response and spectrum using spectral analysis with frequency-dependent resolution
`idfrd`	Frequency response data or model
`getpvec`	Obtain model parameters and associated uncertainty data
`setpvec`	Modify values of model parameters

`bode`	动态系统的波特频率响应
`bodemag`	频率响应的仅幅度波特图
`freqresp`	Evaluate system response over a grid of frequencies
`chgFreqUnit`	Change frequency units of frequency-response data model

What Is a Frequency-Response Model?
A frequency-response model is the frequency response of a linear system evaluated over a range of frequency values.
Estimate Frequency-Response Models in the App
You must have already imported your data into the app and performed any necessary preprocessing operations.
Estimate Frequency-Response Models at the Command Line
Estimate frequency-response models using etfe, spa, and spafdr commands.
Selecting the Method for Computing Spectral Models
How to select the method for computing spectral models during estimation in the app and at the command line.
Controlling Frequency Resolution of Spectral Models
Controlling frequency resolution of spectral models during estimation in the app and at the command line.
Spectrum Normalization
The spectrum of a signal is the square of the Fourier transform of the signal.