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州空间模型

州空间模型with free, canonical, and structured parameterizations; equivalent ARMAX and OE models

州空间模型are models that use state variables to describe a system by a set of first-order differential or difference equations, rather than by one or morenth阶差分或差方程。状态变量X((t)can be reconstructed from the measured input-output data, but are not themselves measured during an experiment.

状态空间模型结构是快速估计的一个不错的选择,因为它要求您仅指定一个输入,即模型顺序,,,,n。模型顺序是一个等于尺寸的整数X((t)并与相应的线性差方程中使用的延迟输入和输出的数量有关,但不一定等于。

It is often easier to define a parameterized state-space model in continuous time because physical laws are most often described in terms of differential equations. In continuous-time, the state-space description has the following form:

X - (( t = F X (( t + G (( t + k w (( t y (( t = H X (( t + d (( t + w (( t X (( 0 = X 0

矩阵F,,,,G,,,,H,,,,anddcontain elements with physical significance—for example, material constants.X0指定初始状态。

您可以使用时域和频域数据估算连续的状态空间模型。

the discrete-time state-space model structure is often written in the创新形式描述噪音:

X (( k t + t = 一个 X (( k t + b (( k t + k e (( k t y (( k t = C X (( k t + d (( k t + e (( k t X (( 0 = X 0

在哪里tis the sample time,((kt)is the input at time instantkt,,,,andy((kt)is the output at time instantkt

您无法使用连续时间频域数据估算离散的状态空间模型。

For more information, see什么是州空间模型?

应用

System Identification 从测量数据中识别动态系统的模型

实时编辑任务

Estimate State-Space Model Estimate state-space model using time or frequency data in the Live Editor

功能

展开全部

IDSS 具有可识别参数的状态空间模型
ssest 使用时域或频域数据估算状态空间模型
ssregest Estimate state-space model by reduction of regularized ARX model
n4sid 使用子空间方法估算状态空间模型与时域或频域数据
佩姆 为改进线性预测误差最小化and nonlinear models
delayest Estimate time delay (dead time) from data
查找状态 Estimate initial states of model
ssform 状态空间模型结构的快速配置
在里面 设置或随机化初始参数值
IDPAR Create parameter for initial states and input level estimation
IDSSDATA State-space data of identified system
getpvec 获取模型参数和相关的不确定性数据
setpvec 修改模型参数的值
getpar 获得属性,例如线性模型参数的值和边界
setpar 设置属性,例如线性模型参数的值和边界
SSESTOPTIONS 选项设置为ssest
ssregestOptions 选项设置为ssregest
n4sidOptions 选项设置为n4sid
查找状态Options 选项设置为查找状态

话题

州空间模型基础知识

什么是州空间模型?

州空间模型are models that use state variables to describe a system by a set of first-order differential or difference equations, rather than by one or morenth阶差分或差方程。

State-Space Model Estimation Methods

在非词法子空间方法之间进行选择,使用预测误差最小化算法的迭代方法和非读写方法。

估算选择订单选择的状态空间模型

to estimate a state-space model, you must provide a value of its order, which represents the number of states.

Canonical State-Space Realizations

Modal, companion, observable and controllable canonical state-space models.

国家空间模万博1manbetx型支持的数据

您可以使用真实或复杂且具有单个或多个输出的时间域和频域数据。

Estimate State-Space Models

估计系统标识应用中的状态空间模型

将数据导入系统标识应用程序。

估算命令行的状态空间模型

执行黑框或结构化估计。

具有规范参数化的估算状态空间模型

规范参数化represents a state-space system in a reduced parameter form where many elements of一个,,,,bandCmatrices are fixed to zeros and ones.

估计状态空间等效于ARMAX和OE模型

此示例显示了如何使用状态空间估计方法估算ARMAX和OE形式模型。

Estimate State-Space Models with Free-Parameterization

状态空间矩阵的默认参数化一个,,,,b,,,,C,,,,d,,,,andk免费;也就是说,矩阵中的任何元素均可通过估计例程调节。

Use State-Space Estimation to Reduce Model Order

减少模拟的顺序万博1manbetx®model by linearizing the model and estimating a lower-order model that retains model dynamics.

结构化估计,创新形式

具有结构化参数化的估计状态空间模型

Structured parameterizationlets you exclude specific parameters from estimation by setting these parameters to specific values.

Identifying State-Space Models with Separate Process and Measurement Noise Descriptions

确定的线性模型用于模拟和预测给定输入和噪声信号的系统输出。

设置状态空间模型选项

Supported State-Space Parameterizations

系统标识Toolbox™软件支持以下参数化,该参数表明估计了哪些参数,哪些参数仍万博1manbetx以特定值固定:

指定迭代估计算法的初始状态

When you estimate state-space models, you can specify how the algorithm treats initial states.