一种基于DSP的高精度频率测量方法.pdf

总第46 卷 第520 期 电测与仪表 Vol.46 No.520 2009 年 第04 期 Electrical Measurement Instrumentation Apr. 2009 一种基于DSP 的高精度频率测量方法* 1 1 2 2 2 钱时祥 , 江炜宁 , 周增建 , 王海 , 周渭 （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） 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。 关键词：多重自相关；过零点检测；高精度；频率 中图分类号：TM935.1 ；TN911 文献标识码：A 文章编号：1001-1390 （2009）04-0017-04 A Frequency Measurement Method with High Accuracy Based on DSP 1 1 2 2 2 QIAN Shi-xiang , JIANG Wei-ning , ZHOU Zeng-jian , WANG Hai , ZHOU Wei （1.China Electronic Science and Technology Group Company, the 41th Research Institute, National Key Laboratory for Electronic Measurement Technology, Qingdao 266555, Shandong, China. 2.Xidian University Tracking technology and Instrument Specialty, Xi ’an 710071, China） Abstract: 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 examin