摘要
针对弱信号条件下的频率精确测量问题,提出了一种新的时域和频域相结合的算法,实现了一种数字式实时高准确度频率测量系统。搭建了系统测试平台,测试结果表明,测量时间为1 024个采样点、归一化频率为0.5条件下,信噪比10 dB情况下相对均方根准确度约为1.2×10-5,信噪比0 dB条件下相对均方根准确度约为7.7×10-5。在较高信噪比、10万点测量时间下相对均方根准确度可达7.1×10-11。
In accordance with the problem of the high accurate frequency measurement, a novel algorithm using both the frequency-domain and the time-domain information is proposed, and a high precise real-time digital frequency measurement system is implemented. The system testing platform is established. The test results show that under the condition of the signal-to-noise ratio（SNR） is 10dB and 0dB the relative root mean square（RMS） accuracy can reach 1.2×10^-5 and 7.7 ×10^-5, respectively, when the number of the sampling points is 1024 and the normalized frequency is 0.5. And the relative RMS accuracy can reach 7.1×10^-11 when the SNR ratio is high and the number of the sampling points is 100 thousand.
出处
《电讯技术》
北大核心
2010年第9期28-32,共5页
Telecommunication Engineering
基金
国家高技术研究发展计划(863计划)项目(2009AA12Z314)~~
关键词
频率测量
实时
高准确度
微弱信号
时域计数
frequency measurement
real-time
high accuracy
weak signal
time domain counter
