Error-Free Loop Gain Adjustment Using Embedded Dynamic Signal Analyzer

김수용; Jihun Koo

doi:10.34163/jkits.2018.13.5.007

As the error tolerance of low-cost components in servo systems such as optical disc drives become wider, the effects of the errors on model uncertainty increase in comparison with a nominal model. In the case of the optical disk, the size of the data pattern is reduced to increase the storage capacity, so that fast, precise and stable control is required to place the laser spot on the disk. In this paper, we introduce a new technique of a loop gain adjustment (LGA) based on an embedded dynamic signal analyzer (EDSA) that is used for estimating the gains and phases at a cross-over frequency of the system. Conventional algorithms repeat LGA operations until the system finds a target value; however, the proposed LGA directly calibrates the target value to coincide with the frequency response of the nominal model. A measuring algorithm for calculation of the frequency characteristics is proposed for the removal of the effects of additive white Gaussian noise. Moreover, because the proposed algorithms are implemented on a system-on-chip, they can be applied to diverse applications, such as robots, vehicles, and aircraft. The experimental and simulation results show that the proposed LGA based on error-free EDSA exhibits notable and reliable performance.

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* 2022년 이후 발행 논문의 참고문헌은 현재 구축 중입니다.

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