MATLAB CONTROL SYSTEM TOOLBOX 9 Spezifikationen Seite 364

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Seitenansicht 363
bode
16-24
bode(g,'r',gd,'b--')
Algorithm For continuous-time systems, bode computes the frequency response by
evaluating the transfer function on the imaginary axis . Only
positive frequencies are considered. For state-space models, the frequency
response is
When numerically safe, is diagonalized for maximum speed. Otherwise,
is reduced to upper Hessenberg form and the linear equation
is solved at each frequency point, taking advantage of the Hessenberg
structure. The reduction to Hessenberg form provides a good compromise
between efficiency and reliability. See [1] for more details on this technique.
For discrete-time systems, the frequency response is obtained by evaluating
the transfer function on the unit circle. To facilitate interpretation, the
upper-half of the unit circle is parametrized as
Hs
()
sj
ω
=
ω
DCj
ω
A
()
1
B+ ,
ω
0
AA
j
ω
A
()
XB=
Hz()
ze
j
ω
T
s
= ,0ωω
N
≤≤
π
T
s
------
=
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