Abstract
目标以极高速度在大气层内运动时，周围会因剧烈摩擦产生等离子体绕流场。等离子体绕流场运动速度分布不均匀，而且绕流场电子密度随时间动态变化，导致等离子体绕流场对入射其中的电磁波产生不均匀的频率调制，进而影响雷达的探测性能。为了复现等离子体绕流场在电磁波照射时产生的不均匀频谱调制现象，本文在中科院力学所JF-10风洞开展了等离子体绕流场回波频谱测量实验，通过信号源、环形器、天线和频谱仪组成的测量系统，以点频发射体制，获取了S、C波段的回波频谱数据，观察到了等离子体绕流场对目标回波频谱的调制现象，对测量现象的形成原因进行了讨论；基于测量数据，仿真分析了等离子体绕流场对目标一维距离像的散焦效应。
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