基于Nuttall自卷積窗的改進FFT譜分析方法
發(fā)布時間:2019-08-03 19:38
【摘要】:建立性能優(yōu)良的窗函數(shù)是提高頻譜分析準確度的關(guān)鍵。本文用Nuttall窗進行時域卷積運算構(gòu)建Nuttall自卷積窗,具有旁瓣性能隨卷積次數(shù)增加而迅速提升的優(yōu)點;提出基于Nuttall自卷積窗的改進FFT譜分析方法,采用最小二乘法推導離散頻譜插值多項式,建立諧波參數(shù)準確求解算法;通過仿真實驗驗證Nuttall自卷積窗及改進FFT譜分析方法的有效性和準確性。
[Abstract]:The establishment of window function with excellent performance is the key to improve the accuracy of spectrum analysis. In this paper, the time domain convolution operation of Nuttall window is used to construct Nuttall self-convolution window, which has the advantage of rapid improvement of sidelobe performance with the increase of convolution times. An improved FFT spectrum analysis method based on Nuttall self-convolution window is proposed, the discrete spectrum interpolation polynomial is deduced by the least square method, and the accurate algorithm for solving harmonic parameters is established. The effectiveness and accuracy of the Nuttall self-convolution window and the improved FFT spectrum analysis method are verified by simulation experiments.
【作者單位】: 廣西電網(wǎng)公司電力科學研究院;湖南大學電氣與信息工程學院;
【基金】:國家自然科學基金資助項目(51277058)
【分類號】:TM935
[Abstract]:The establishment of window function with excellent performance is the key to improve the accuracy of spectrum analysis. In this paper, the time domain convolution operation of Nuttall window is used to construct Nuttall self-convolution window, which has the advantage of rapid improvement of sidelobe performance with the increase of convolution times. An improved FFT spectrum analysis method based on Nuttall self-convolution window is proposed, the discrete spectrum interpolation polynomial is deduced by the least square method, and the accurate algorithm for solving harmonic parameters is established. The effectiveness and accuracy of the Nuttall self-convolution window and the improved FFT spectrum analysis method are verified by simulation experiments.
【作者單位】: 廣西電網(wǎng)公司電力科學研究院;湖南大學電氣與信息工程學院;
【基金】:國家自然科學基金資助項目(51277058)
【分類號】:TM935
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