加窗插值FFT谐波分析算法的误差估计

摘要

FFT has relatively large errors in the condition of asynchronizing sampling, and therefore is not satisfied when high harmonic parameter accuracy is requested. To some extent, interpolating windowed FFT algorithm for harmonic analysis can be used to improve the accuracy. The error bounds of the algorithm by computer simulation is analyzed, which shows that in the harmonic analysis application, the errors of interpolating windowed FFF algorithm are relatively large in some condition and the error bounds should be used to evaluate the accuracy of the algorithm.%非同步采样的情况下,快速傅里叶变换用于谐波分析存在较大的误差,很难获得准确的谐波参数.加窗插值FFT谐波分析算法能够减小谐波分析误差.针对该算法,借助计算机仿真研究了谐波分析时误差的变化规律以及最大的误差限.最后给出了谐波分析应用中的若干重要结论.