A NEW EFFICIENT FDTD TIME-TO-FREQUENCY- DOMAIN CONVERSION ALGORITHM
A NEW EFFICIENT FDTD TIME-TO-FREQUENCY- DOMAIN CONVERSION ALGORITHM
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DOI：
10.2528/pier09030906
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发表时间：
2009
影响因子：
6.7
通讯作者：
Yanhui Liu;Q. Liu;Z. Nie
中科院分区：
文献类型：
--
作者：
Yanhui Liu;Q. Liu;Z. Nie
在时域有限差分法（FDTD）的许多应用中，经常需要进行时域到频域的转换。本文提出了一种基于非均匀快速傅里叶变换（NUFFT）优化的时域有限差分（FDTD）时频转换新算法。该算法可以在多个所需的频率进行FDTD转换，而不受快速傅里叶变换（FFT）中均匀间隔频率的限制。此外，由于存储成本非常低，如果对中等数量的频率或更多频率感兴趣，该算法可以比其他FDTD转换技术更有效。该算法在某些FDTD应用中是非常有用的。
The time-to-frequency-domain conversion is often required in many applications of the finite-difference time-domain (FDTD) method. This paper presents a new FDTD time-to-frequency- domain conversion algorithm based on the optimization of nonuniform fast Fourier transform (NUFFT) with several redundancy-reduction techniques. The proposed algorithm can perform the FDTD conversion at multiple desired frequencies without the limitation of uniformly spaced frequencies in the fast Fourier transform (FFT). In addition, with a very low storage cost, the algorithm can be much more efficient than other FDTD conversion techniques if a moderate number of frequencies or more are of interest. This algorithm is very useful for some FDTD applications.