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中文摘要：
研究了线性调频步进信号体制下雷达目标的微多普勒效应,分析了距离像走动和卷绕现象,并重点讨论了旋转和振动形式的微动引起的微多普勒效应,推导出了其在距离-慢时间平面的解析表达式.在此基础上,提出利用推广的Hough变换法并结合时频分析来提取微多普勒特征的方法,并详细论述了不同旋转（振动）频率和半径（振幅）情况下的处理算法.仿真实验验证了文中微多普勒效应理论分析和特征提取方法的正确性.
英文摘要：
The theory of the micro-Doppler（m-D） effect in frequency-stepped chirp signal is studied,and the causations of the range profile s migration and wrapping are analyzed.The m-D effects induced by rotation and vibration are discussed in detail and the analytical expressions of the m-D signatures in the range-slow time plane are deduced.The algorithm for extraction of m-D signatures is proposed which is based on the Hough transform and time-frequency analysis.The implementations of the algorithm under condition of different rotating/vibrating frequencies and radii are discussed. Simulations are given to prove the validity of the theoretical analyses and the proposed m-D extraction method.
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