摘要
在修正离散线性调频傅里叶变换(MDCFT)估计线性调频信号(LFM)参数时,当变换序列的起止点没有与实际有效信号对齐时,其中心频率会出现偏移,导致错误估计。针对该问题,本文提出一种分段的MDCFT算法,该方法通过对未知起止时刻的序列进行等长的分段MDCFT,并结合各段之间的幅度频率关系,实现中心频率的准确估计。通过仿真证明了算法的有效性。
When estimating parameters of Linear Frequency Modulation signal based on MDCFT, the center-frequency migrates when samples doesn’t start and end as the real signal does, defined as Uncomplete LFM samples.To solve this issue,a Multi-Segment MDCFT was proposed,based on which recovering the accurate center-frequency is possible.The simulation results prove that this method is effective.
出处
《电子测试》
2014年第S2期41-43,共3页
Electronic Test
关键词
MDCFT
LFM信号
参数估计
Modified Discrete Chirp-Fourier Transform
Linear Frequency Modulation signal
Parameter estimation
