摘要
在研究噪声对低信噪比正弦信号频率测量的影响、分析触发误差对多周期同步频率测量影响的基础上，提出了一种多．多周期同步频率测量方法，推导了频率测量计算公式和误差计算公式，并对两种测频方法的触发误差做了对比分析；最后给出了用STM32单片机实现多-多周期同步频率测量的方法。实验表明：该方法能有效压制噪声，提高低信噪比正弦信号频率测量精度。
The effect of noise to frequency measurements on the condition of lowSNR is studied, on the basis of multi-cycle synchronization frequency measurement, method of an multi-multi-cycle synchronization frequency measurement is putforward and the formula of frequency measurement ＆ error calculation is deduced. At the end, the implementation methodand ealeulationformula based on STM32 MCU are given. Experimentresuh shows that for the low SNR sinusoidal signal, themethod introduced can effectively suppress noise, and increases the accuracy of frequency measurement.
出处
《计量学报》
CSCD
北大核心
2015年第2期212-215,共4页
Acta Metrologica Sinica
关键词
计量学
频率测量
多一多周期同步测频
信噪比
触发误差
Metrology
Frequency measurement
Multi-multi-cycle synchronization frequency measurement
Signal-noise-ratio
Trigger error
