用FT法实现相关函数快速估计的程序，简简单明了，方法简易，适用与地球物理工作者 -Rapid estimation procedure of the correlation function using the FT method, the simple straightforward method is simple, applicable and Geophysics workers

傅里叶变换可以把数据转换到频域中，是数学计算常用的变换方法-Fourier transform data conversion into the frequency domain, the mathematical calculations commonly used in transformation