摘要
针对传统的基于自相关法的弱正弦信号频率测量中存在准确度不高的问题,本文研究了一种新的检测微弱正弦信号频率的方法,利用正弦信号的特性,通过双通道采集微弱信号,利用多重自相关和互相关原理,结合四点式频率估计和多点绝对值补偿,有效地检测了微弱信号的频率,并与传统的单通道自相关频率检测原理做了对比,结果表明本文的算法准确度更高、算法简单、实用性较强。
The accuracy of traditional method for frequency detection based on auto-correlation is not high, and a new method for frequency of weak sinusoidal signal in powerful noise based on dual-chan- nel is introduced in this paper. Using the principle of multi-layer correlation and the curve fitting tech- nique with only four points and uses multi-point frequency compensating technique. The simulations proves its feasibility and effectiveness to detect the weak sinusoidal signal and having much higher resolu- tion than auto-correlation method. So it has some practical value.
出处
《宇航计测技术》
CSCD
2013年第3期48-52,共5页
Journal of Astronautic Metrology and Measurement
关键词
微弱信号
频率检测
多重相关法
Weak signal Frequency detection Multi-layer cross correlation
