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引用本文：

刘永刚,孟真,阎跃鹏.高准确度数字式时频域实时频率测量系统[J].电讯技术，2010，50（9）： - . [点击复制]
LIU Yong-gang,MENG Zhen,YAN Yue-peng.A Novel High Precise Real Time Digital Frequency Measurement System[J].，2010，50（9）： - . [点击复制]

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高准确度数字式时频域实时频率测量系统
刘永刚,孟真,阎跃鹏
0 字体:加大+\|默认\|缩小-
(中国科学院微电子研究所,北京 100029)

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1.2×1 0-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。

关键词: 频率测量实时高准确度微弱信号时域计数

DOI：

基金项目:国家高技术研究发展计划（863计划）项目（2009AA12Z314）

A Novel High Precise Real Time Digital Frequency Measurement System

LIU Yong-gang,MENG Zhen,YAN Yue-peng

(Institute of Microelectronics,China Academy of Sciences, Beijing 100029, China)

Abstract:

In accordance with the problem of the high accurate frequency measure ment, a novel algorithm using both the frequencydomain and the timedomain in fo rmation is proposed, and a high precise realtime digital frequency measurement system is implemented. The system testing platform is established. The test resu lts show that under the condition of the signaltonoise ratio(SNR) is 10dB an d 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 an d 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.

Key words: frequency measurement real time high accuracy weak signal time domain count er