高准确度数字式时频域实时频率测量系统  

A Novel High Precise Real-Time Digital Frequency Measurement System

作　　者：刘永刚[1] 孟真[1] 阎跃鹏[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《电讯技术》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)~~

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.

关 键 词：频率测量 实时 高准确度 微弱信号 时域计数 

分 类 号：TN911[电子电信—通信与信息系统]