A new method of stability margin clearance of missile autopilot is described. The structured singular value theory is used to analyze the autopilot performance of missile which has uncertainty parameters and determine the "worst case" combination of uncertain parameters. First, a model of linear fractional transformation form is established for missile with uncertain parameters; then, the system stability margin requirements are seen as a virtual non-structural uncertainty and introduced into the models Finally, the structured singular value theory is used to analyze the model. The clearance results prove the performance requirements for the autopilot are satisfied, the "worst case" combination of uncertain parameters is also obtained. The results show it is a more efficient and accurate clearance method than traditional one.%介绍了一种关于导弹自动驾驶仪稳定裕度评估的新方法；利用结构奇异值理论对存在不确定性参数的导弹自动驾驶仪性能进行分析,并确定“最坏情况”时不确定性参数的组合；首先,针对存在不确定性参数的导弹系统,建立线性分式变换(LFT)形式的模型；然后,将系统稳定裕度要求看作虚拟的非结构不确定性并引入模型；最后,使用结构奇异值理论对模型进行分析.分析证明自动驾驶仪满足性能要求,并且得到了最坏情况的不确定参数组合:结果表明这是一种比传统方法更加高效和准确的评估方法.
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