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Questions tagged [system-identification]

System identification means building a mathematical model of the input-output relationship of a system by observing its inputs and the subsequent outputs.

System identification means building a mathematical model of the input-output relationship of a system by observing its inputs and the subsequent outputs.

129 questions
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Choosing Drive Signals for System Identification?

(I'm just learning a little about system identification so apologies in advance if this question is badly worded) How do you go about choosing drive signals for system identification? I've seen PRBS signals used but it seems like that's going to…
Jason S
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Is this input function time varying?

I'd like to understand when an input signal is time varying or time invariant. Specifically, I have this function: $y(n) = x(n) + 0.1 + (0.2)^n + x(n-3)$ I thought that this is time varying because of the $n$ in the exponent. Would anyone mind to…
Ci3
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Black-box system identification procedure

I am fairly new to system identification (some background in DSP), and I am trying to use a linear black-box system identification procedure. I am specifically looking for recommendations of sources with a well-described procedure on how to…
Mark
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System identification only using sine input?

Recently, I'm working on modeling a sensor's system model using system identification. Subject to the experiment condition, I only have the sine input signal. In addition, the frequency can not continuous change. In other words, I only have some…
lxalxy
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Periodogram: an inconsistent estimator

What is the reason that a periodogram is not a consistent method for obtaining information about frequency response of a system? To be more precise, why even after increasing number of samples doesn't the variance of the estimator decrease?
Chandresh Sharma
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Confusion regarding application of time invariance to flip system?

I am reading book signal processing first Chapter 5 I am reading article of time invariance Where author mentions example of a flip system as shown in attached photo ,i have drawn a red curve above confusion equation I am confused, how he is doing…
DSP_CS
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Recursive system

Trying to identify if the system below is recursive or not, I would think a recursive system present output value would depend of a past output and not on a present output value. Is $$Y[n] = X[n] - Y[n] $$ a recursive system?
Didi
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Normalize data for transfer function determination?

I have the input and the output of a system and I want to determine the transfer function of it. I am using Ident Tool from Matlab. How is it more ok: to normalize the output and the input between 0 and 1 or to leave it as they are?
Razvan
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choosing an input signal for system identificaiton

I know we can use a -step -impulse -sinus -multisine -random phase multisine To identify a system. But what are the advantages/disadvantags of each type of input?
Thomas
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