delayest

Estimate time delay (dead time) from data

Syntax

nk = delayest(Data) nk = delayest(Data,na,nb,nkmin,nkmax,maxtest)

Description

nk = delayest(Data)estimates time delay from data.Datais aniddataobject containing the input-output data. It can also be anidfrdobject defining frequency-response data. Only single-output data can be handled.nkis returned as an integer or a row vector of integers, containing the estimated time delay in samples from the input(s) to the output inData.

The estimate is based on a comparison of ARX models with different delays:

$\begin{array}{l} y (t) + a_{1} y (t - 1) + ... + a_{n a} y (t - n a) = \\ b_{1} u (t - n k) + ... + b_{n b} u (t - n b - n k + 1) + e (t) \end{array}$

nk = delayest(Data,na,nb,nkmin,nkmax,maxtest)specifies additional options. The integernais the order of the A polynomial (default 2).nbis a row vector of length equal to the number of inputs, containing the order(s) of the B polynomial(s) (default all 2).nkminandnkmax长度相同的行向量的号码啊f inputs, containing the smallest and largest delays to be tested. Defaults arenkmin = 0andnkmax = nkmin+20. Ifnb,nkmax, and/ornkminare entered as scalars in the multiple-input case, all inputs will be assigned the same values.maxtestis the largest number of tests allowed (default 10,000).

Introduced before R2006a

System Identification Toolbox Documentation

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