【摘要】 本文将Ｍｏｒｌｅｔ小波用于电磁场后向散射信号的时频分析．为了更好地提高时频分析的时间和频率分辨率，我们对Ｍｏｒｌｅｔ小波进行了改进，并合理地选择尺度的变化规律，数据结果证明无论在同时提高时频分辨率还是抗噪声能力上，改进的Ｍｏｒｌｅｔ小波时频分析都优于短时傅里叶变换和Ｗｉｇｎｅｒ－Ｖｉｌｌｅ分布。更多还原

【Abstract】 The Morlet wavelet analysis is applied to analyze the time-frequency properties of electromanetic backscattered signals from targets. To improve the time and frequency resolution,we construct a related wavelet with instantaneous frequency that increases linearly with time,and make the scale increase properly. Compared with the conventional short-time Fourier transform and Wigner-Ville distribution, the numerical results show that the wavelet time-frequency analysis provides high time resolution in the early-time high frequency resolution in the late-time,and high detectivity in nolses.更多还原