非均匀DFT频谱泄漏抑制方法研究

Research on frequency spectrum leakage suppression method of nonuniform DFT

针对不规则采样信号的谱估计问题,提出一种非均匀离散傅里叶变换频谱泄漏抑制方法,通过迭代非线性估计实现了非均匀采样信号离散傅里叶变换的计算.进行了数值计算试验,并给出了缺失数据重建的应用实例.计算结果表明,该方法能有效抑制非均匀离散傅里叶变换结果中的频谱泄漏,提高DFT频谱的分辨率.

Aiming at spectra estimation issues of irregular sampling signals, this paper presents a suppression method of frequency spectrum leakage for nonuniform discrete Fourier transform（NDFT）. The DFT computation of nonuniform sampling signals is performed via iterative nonlinear estimation. Actual computing results show that the approach can effectively suppress frequency spectrum leakage in NDFT results, improve the resolution of DFT spectrum.