impulse estimation nonparametric method

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arash rad
arash rad 2020-12-2
Hi everyone
please help me
I have a tf and i want to ident it with impulse respone (nonparametric method) but I can't when i use impulseest
my data is time-series and when I use impulseest I found errors
can anyone help me with this please
I want to estimate my tf with a second-order tf
thanks
s = tf('s')
G2 = (s+1)/((s+2)*(s^2+2*s+3))
[y,time] = impulse(G2);
figure(1)
impulse(G2)
variance = 0.01;
noise = sqrt(variance)*randn(150,1);
y_new = noise + y;
figure(2)
plot = (y_new)
Ts = 1
data = iddata(y,[],Ts)
impulseest(data)

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