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Modified short-time Fourier transform

机译:修改后的短时傅立叶变换

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摘要

The short-time Fourier transform (STFT) is a typical time-frequency 2-D analysis method for nonstationary signals. Its applications in engineering are limited because of its fixed window, which results in low time-frequency resolution. To surmount this disadvantage, a modified short-time Fourier transform (MSTFT) is proposed. The minimum entropy is adopted as a criterion to determine the width of the window, and variable-width windows to accommodate the signal's characteristics are used instead of constant-width windows. Since it is difficult to find the optimal window width, wavelet packet transformation is utilized to find an approximate solution for it. This method is also applied to multi-target imaging for inverse synthetic aperture radar, and satisfactory results are achieved.
机译:短时傅立叶变换(STFT)是用于非平稳信号的典型时频二维分析方法。由于其固定的窗口,因此其在工程中的应用受到限制,从而导致较低的时频分辨率。为了克服这个缺点,提出了一种改进的短时傅立叶变换(MSTFT)。采用最小熵作为确定窗口宽度的标准,并使用可变宽度窗口来适应信号的特性,而不是恒定宽度窗口。由于很难找到最佳的窗口宽度,因此利用小波包变换为它找到一个近似解。该方法还应用于逆合成孔径雷达的多目标成像,取得了满意的结果。

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