【摘 要】
：
The high-accuracy drag-free control is one of the key technologies for gravity gradient satellites.Since the range of the gravity gradiometer is limited,the measurement is subject to the saturation constraint.This paper introduces a design method of the a
【机 构】
：
Science and Technology on Space Intelligent Control Laboratory,Beijing Institute of Control Engineer
论文部分内容阅读
The high-accuracy drag-free control is one of the key technologies for gravity gradient satellites.Since the range of the gravity gradiometer is limited,the measurement is subject to the saturation constraint.This paper introduces a design method of the adaptive drag-free control law by employing the set-valued identification approach.By inserting several thresholds in the constrained interval,the output observation is transformed into the set-valued information under different thresholds,based on which and the weighted optimization technique the identification algorithm for the unknown parameter is constructed.The adaptive drag-free control law is designed via the certainty equivalence principle.It is shown that the identification algorithm is strongly convergent and the convergence rate of the estimation error is obtained.The perfor-mance of the closed-loop system is analyzed,and the asymptotic optimality of the adaptive controller is proved.The numerical simulation is included to verify the effectiveness of the main results.
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