How can you find the poles of a steady state system using c2d and the sampling frequency ?

Hi everyone,

I have the steady state model of a system which I want to discretise. I also have the sampling frequency. I have used c2d but I don´t know how I may I identify the poles of the system to assess its stability. Any help would be greatly appreciated.

Answer 1

[Jon]

Suppose you have a continuous plant model g and you discretize it with the sampling period ts

% discretize
gd = c2d(g,ts)

% find poles
p = pole(gd)

% check stability (poles must be inside of unit circle for discrete system stability)
isStable = all(abs(p) < 0)