摘要
频谱泄露是影响谐波检测和频谱分析的重要原因,而采样频率与信号频率不同步是造成频谱泄露的根本原因。现提出一种幅值和相位自校正的算法,可通过自动校正减小异步采样时DFT产生的幅值和相位的误差,降低频谱泄露造成的影响,对同步采样条件下的DFT没有影响,并给出算法的实现步骤和仿真结果,证明了该算法能精确地得到信号的实际幅值和相位,对于采样点数较少的信号也能给出较高的测量精度,而且该算法具有迭代特性,原理简单,是频谱分析中的一种有效方法。
Spectrum leakage is the important reason that impacts harmonic detection and spectrum analysis,the sampling frequency is not synchronized with the signal frequency is the root cause of spectrum leakage. This paper presents an amplitude and phase self-correction algorithm,which can automatically correct error caused by DFT under asynchronous sampling condition and have no effect on the DFT under synchronous sampling condition,moreover shows implementation steps and simulation results of the algorithm,proves that the algorithm can not only accurately get the actual amplitude and phase of the signal,but also give out a higher measurement accuracy for the signal sampling points fewer.This algorithm has iterative character and simple principle,is an effective method in spectrum analysis.
出处
《信息技术》
2015年第8期153-155,159,共4页
Information Technology
关键词
频谱泄露
异步采样
DFT
自校正
精确
spectral-leakage
asynchronous-sampling
DFT
self-correction
accuracy
