GATE EE 2014 Set 2 — Question 43
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Control Systems → Laplace & Z Transforms → Difference Equations
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Question
A discrete system is represented by the difference equationIt has initial conditions . The pole locations of the system for , are
Correct answer
(A) 1 ± j0
Solution
1.The poles of a discrete system represented in state-space form are the eigenvalues of the matrix .
2.Given . For , the matrix becomes .
3.The eigenvalues are found by solving the characteristic equation .
4..
5.Solving gives .
6.Thus, the pole locations are at .
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