MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador descarregar pdf (Página 131)

Resampling of Discrete-Time Models

Resampling of Discrete-Time Models

You can resample a discrete-time TF, SS, or ZPK model sys1 by typing

sys2 = d2d(sys1,Ts)

The new sampling period Ts does not have to be an integer multiple o f the

original sampling period. For ex ample, typing

h1 = tf([1 0.4],[1 –0.7],0.1);

h2 = d2d(h1,0.25);

resamples h1 at the sampling period of 0.25 second s, rather than 0.1 seconds.

You can compare the step responses of

h1 and h2 by typing

step(h1,'--',h2,'-')

The resulting plot is shown on the figure below (h1 is the dashed line).

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MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador Página 131