中文摘要：

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。

英文摘要：

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.