本文提出了一种改进的一电平削波自相关算法，不仅从原来上分析了该算法具有良好的抗噪性能的原因，而且利用十五种不同的脚步声对该算法进行了测试，结果证明算法的有效性。-This paper proposes an improved one level clipping autocorrelation algorithm, not only from the original analyzed the resistance of the algorithm has good noise performance reasons, and Li Yong 15 kinds of different step algorithm was tested, 结果prove its validity.