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中文摘要：
以近地环境下无阻力卫星控制器设计为研究对象,分析近地环境下无阻力卫星主要的干扰源及干扰的特性,建立干扰的动力学模型,通过将干扰扩展为系统状态,建立基于干扰观测的无阻力卫星动力学模型,针对该动力学模型设计混合H2/H∞最优控制器,并以线性矩阵不等式（LMI）形式给出求解控制器的条件和证明控制器的稳定性,仿真结果验证本文提出控制器的稳定性和可行性。
英文摘要：
The controller design of Drag-Free satellites on near-earth orbit is the object of the study.After analyzing characteristics of main disturbances affecting Drag-Free satellites,a disturbance dynamics model is established.Adding the disturbance to the system,a disturbance observation based-dynamics model of Drag-Free satellite is built.Then a mixed H2/H∞ controller is designed and the LMI form is used to solve it.Simulation results verify stability and feasibility of the controller.
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