Abstract
This paper presents a method for designing adaptive pole placers for plants with narrow-band noise.
Although a number of methods for designing adaptive pole placers for plants with no noise have been reported, a few for plants with noise. In order to design the placers that can exhibit reasonable performance to the plants with noise of nonnegligible amplitude, it is necessary to use the methods taking into account the characteristics as well as the existence of the noise. This paper proposes such a method, specifically for the plants with narrow-band noise. The proposed method is an indirect one and is characterized by the employment of noise-rejection filters. Considering narrow-band characteristics of the noise, the approach using such filters will be a reasonable one. The filters employed in the placer play the important role to reject the noise influences not only in the estimation process of plant parameters but also in the output of the resulting adaptive system. An effective and robust structure for the placer with the filters is also suggested, which can accommodate, without modification, new schemes developed to overcome the restriction on plant order.
