用于一般访求不能达到分辨率的频率检测方法，可以高精度检测频率。尤其是对于分辨率达不到要求的时候，用此方法能达到很高的分辨率。对有用频段的频率进行高分辨率的细化。-Usually visit requirements can not achieve the resolution of the frequency detection methods, and can be detected with high precision frequency. Especially for the resol