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提出了用FFT(fastfouriertransform)分析与表征随机表面空间形貌特征的方法 ,对随机表面的PSDF(powerspectrumdensityfunction)和ACVF(auto covariancefunction)或ACF(autocorrelationfunction自相关函数 )进行了系统分析 ,用基 2DIT FFT(discretein timeFFT)对表面信号分别在时域和频域进行了分析与讨论 ,阐述了从原理方法到运算速度的优越性
A fast Fourier transform (FFT) method was proposed to analyze and characterize the spatial surface features of random surfaces. The PSDF (powerspectrum intensity function) and ACVF (auto covariancefunction) or ACF (autocorrelationfunction autocorrelation function) (discretein timeFFT) on the surface signal in the time domain and frequency domain were analyzed and discussed, from the principle and method to speed the superiority