摘要
针对频率未知周期信号的时域平均问题,提出了一种通过相位补偿实现频率未知周期信号时域同步平均的方法。该方法采用FFT估计分段信号相邻段之间的相位差并补偿,使分段信号同步平均。对于多频率分量周期信号,采用自适应notch滤波器从原始信号中消除已增强并估计出频率的信号分量后,对剩余信号重复上述处理过程,可依次实现各频率分量的同步平均处理。计算机仿真表明,该方法不需要对未知信号频率进行搜索,大大提高了计算效率。
A novel time synchronously averaging method using phase compensation was proposed to deal with the periodic signal with unknown frequency. Since the phase difference was the same between adjacent data segments, it might be esti- tinted with FFT （Fast Fourier Transform）, and the result can be used to compensate the phase difference between data segments As a result, all the s^ments were synchronized in phase and could be time synchronously averaged to enhance the periodic signal to the most For periodic signal with multi-frequency components, the adaptive notch filter was used to cancel the enhanced signal from the original input signal, and the remained signal could be processed in the same manner repeatedly until all the frequency comlmnents were enhanced and extracted. Computer simulations verified that the method did not need to search the unknown frequency extensively, which was more efficient in applications.
出处
《探测与控制学报》
CSCD
北大核心
2014年第4期5-8,共4页
Journal of Detection & Control
关键词
微弱信号检测
时域平均
相位补偿
weak signal detection
time averaging
phase coition
