On Phase Information in Multivariable Systems
On Phase Information in Multivariable Systems
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Date
1991
Authors
Lee, Li
Tits, A.L.
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Abstract
The "median phase" and "phase spread" of a matrix are defined and properties are derived. The question of robust stability under uncertainty with phase information is addressed and a corresponding necessary and sufficient condition is given. This condition involves a "phase sensitive singular value". A computable upper bound to this quantity is obtained. The case when the uncertainty is block-structured is also considered.