qAnother way to bound the
frequency response is to treat and as norm bounded uncertainities;
that is,

with *P**0**=P*(*s,0,0*) and

It is in fact easy to
show that

with |*W*|=|*W**1*|+|*W**2*|.

The frequency response *P**0**+W**D* is shown in Figure 8.15. This
bounding is clearly more conservative.

Figure 8.15: A
conservative covering

Continued.