一种基于DSP的高精度频率测量方法  

A Frequency Measurement Method with High Accuracy Based on DSP

作　　者：钱时祥[1] 江炜宁[1] 周增建[2] 王海[2] 周渭[2] 

机构地区：[1]中国电子科技集团公司第四十一研究所电子测试技术国防科技重点实验室,山东青岛266555 [2]西安电子科技大学测控技术与仪器系,西安710071

出　　处：《电测与仪表》2009年第4期17-20,49,共5页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(10703004)

摘　　要：本文研究了一种基于多重自相关的过零点频率估计算法,利用正弦信号的特性,进行多重自相关运算,有效地提高信噪比,结合过零点检测法对信号的频率进行估计,从而提高了频率测量的准确度,同时也给出了具体的硬件结构设计和算法实验。实验结果表明该方法能有效地对信号的频率进行估计,比传统的直接过零估计算法精度要高1～2个数量级。A new method of frequency measurement by zeroes examination after several times autocorrelation is introduced in this paper. By the trait of sinusoidal signal we do some times autocorrelation, which can improve Signal-to-Noise effectively. And then with the method of zeroes examination, the veracity of signal frequency measurement can be improved. We also provide hardware frame design and arithmetic experiment. Experiment results indicate that this method can estimate signal＇s frequency effectively, and it improves 1-2 number degree compared to the traditional zeros examination.

关 键 词：多重自相关 过零点检测 高精度 频率 

分 类 号：TM935.1[电气工程—电力电子与电力传动] TN911[电子电信—通信与信息系统]