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利用McClellan变换能大大地减小显式褶积法在三维波场深度外推中的计算成本。这种基于McClellan变换的偏移法的精度取决于变换滤波器(cos|k|)所作近似的好坏,这种近似中的误差会引起外推算子的各向异性和偏移结果中的频率弥散。
Using McClellan transform can greatly reduce the computational cost of explicit convolution in depth extrapolation of three-dimensional wavefields. The accuracy of this offset method based on the McClellan transform depends on the approximation made by the transform filter (cos | k |). The error in this approximation will cause the anisotropy of the extrapolation operator and the frequency in the offset result dispersion.